Home | Professor Mean

This is the home page of a project that will try to combine my website (started in 1998) with my blog (started in 2012). It is still a work in progress, so please be patient.

2020/12/12 How can you learn R?
2020/12/11 Advice From Blind Teachers on How to Teach Statistics to Blind Students
2020/12/07 Advice From Blind Teachers on How to Teach Statistics to Blind Students
2020/11/24 The tidy tools manifesto
2020/11/20 Advice for a beginner Bayesian
2020/11/19 Complementary Log-Log Model for Interval-censored Survival Times
2020/11/19 Generalized Linear Models
2020/10/30 Election Maps Are Everywhere. Don’t Let Them Fool You.
2020/10/29 Disappearing Data
2020/10/22 The Evolution of Data Science … As I Remember It
2020/10/20 Making genome data come alive with circos plots
2020/10/12 Basic notation for survival or time-to-event analyses
2020/10/08 Bias in Bias Recognition
2020/10/08 Excel: Why using Microsoft’s tool caused Covid-19 results to be lost
2020/10/01 How I got started in Evidence-Based Medicine
2020/09/26 A New Standard For Publishing On Racial Health Inequities
2020/09/26 Philosophy of Data Science | Welcome to the Series!
2020/09/26 Stats + Stories
2020/09/04 Warning: Physics Envy May be Hazardous to Your Wealth
2020/09/01 Research interests
2020/08/31 Biopharmaceutical Section Offers Advice for ASA Fellow Nomination
2020/08/31 Wavelet Pooling for Convolutional Neurual Networks
2020/08/28 Statisticians React to the News
2020/08/21 A New Standard For Publishing On Racial Health Inequities
2020/08/21 AI Fairness 360 Open Source Toolkit
2020/08/21 Envisioning a Transformed Clinical Trials Enterprise in the United States
2020/08/21 Relationship Between Total and Bioaccessible Lead on Children’s Blood Lead Levels in Urban Residential Philadelphia Soils
2020/08/20 Setting the Stage: Statistical Collaboration Training Videos
2020/08/16 Upload data from R to an HTML page with rmarkdown and ftpUpload
2020/08/14 Filed under: The differences
2020/08/11 Data 8: The Foundations of Data Science
2020/08/11 Health statistics represent…
2020/08/11 Simple Demographics Often Identify People Uniquely
2020/08/11 Simple Demographics Often Identify People Uniquely
2020/08/09 Biography for a research grant
2020/08/06 How to be more effective in your professional life
2020/08/06 The ASCCR Frame for Learning Essential Collaboration Skills
2020/07/31 Getting science published
2020/07/31 The Scientist’s Guide to Poster Design
2020/07/30 Data for Black Lives
2020/07/15 AMS Style Guide
2020/07/12 Aleatory and epistemic uncertainties can completely derail medical research results
2020/06/24 Attack on statistical significance: A balanced approach for medical research
2020/06/13 Florida fired its coronavirus data scientist. Now she<U+FFFD>s publishing the statistics on her own.
2020/06/13 Tests of trend between disease outcomes and ordinal covariates discretized from underlying continuous variables
2020/06/13 Tests of trend between disease outcomes and ordinal covariates discretized from underlying continuous variables
2020/06/11 How to Call B.S. on Big Data.
2020/05/24 Constructing sound science and good epidemiology: tobacco, lawyers, and public relations firms
2020/05/24 Steve Milloy misfires
2020/05/23 In medicine, there is automatic…
2020/05/12 The Bioconductor library of packages for R
2020/05/05 The tendency of some modelers…
2020/04/30 Reading text files
2020/04/27 An incomplete list of data repositories
2020/04/15 Codes for COVID-19 in the electronic health record
2020/04/13 Analyzing ordinal data with metric models: What could possibly go wrong?
2020/03/15 Blog post: Different map projections
2020/03/11 Blog post: An example of a poor color choice
2020/03/10 Blog post: UMKC big data and data science initiatives
2020/03/04 Barbershop music
2020/03/04 Food inspections
2020/03/02 Blog post: Smart quotes, em dashes, and en dashes
2020/02/27 Blog post: Proposed talk on secondary data analysis
2020/02/21 No aphorism is more frequently repeated…
2020/02/04 Blog post: Data collection in a research methods class
2020/02/04 Blog post: Data visualizaiton as art
2020/01/29 Blog post: Printing R Markdown output to png files
2020/01/26 Artist wanted, here are the details
2020/01/23 Blog post: Celebrating the failures of medical research using a graphic novel format
2020/01/17 Blog post: Imbalanced sample sizes in the Fisher Exact test
2020/01/07 Blog post: Identifying and manipulating non-breaking spaces
2019/05/15 PMean: Finding me on the Internet
2019/05/10 Recommendation: PROC-X.com. An online (unofficial) SAS journal – written by bloggers
2019/05/09 Recommendation: Scientists’ grant writing styles vary by gender
2019/05/02 PMean: Several Python resources
2019/05/02 Recommendation: Assessment Resource Tools for Improving Statistical Thinking
2019/04/25 PMean: Writing the methods section of a research paper
2019/04/25 Recommendation: A tribute to Douglas C. Altman, DSc
2019/04/25 Recommendation: Data science curriculum roadmap
2019/04/18 Recommendation: Bibliographies and citations (in R Markdown)
2019/04/18 Recommendation: Separating Unique and Duplicated Observations Using PROC SORT in SAS 9.3 and Newer Versions
2019/04/17 Recommendation: What would Florence Nightingale make of big data?
2019/04/16 Recommendation: When Big Data goes to school
2019/04/16 Recommendation: Writing a discussion section: how to integrate substantive and statistical expertise
2019/04/07 Recommendation: Copyright and Data
2019/04/04 Recommendation: Case for omitting tied observations in the two-sample t-test and the Wilcoxon-Mann-Whitney Test
2019/04/03 Recommendation: When life gives you coloured cells, make categories
2019/04/01 Recommendation: Ethical Practice in Data Mining
2019/03/29 PMean: Writing the introduction section of a research thesis or dissertation
2019/03/25 Recommendation: Census Geocoder
2019/03/25 Recommendation: Data Science Has Become About Lending False Credibility To Decisions We’ve Already Made
2019/03/23 Recommendation: Harvard University Program on Survey Research
2019/03/15 Recommendation: A systematic review shows no performance benefit of machine learning over logistic regression for clinical prediction models
2019/03/14 Recommendation: Webinar Series, Congressionally Directed Medical Research Programs
2019/03/08 Did you hear about the mathematician…
2019/03/08 Recommendation: LaTeX/Mathematics
2019/03/08 Recommendation: R Markdown Basics
2019/03/06 Recommendation: 12 things I wish I’d known before starting as a Data Scientist
2019/03/06 Recommendation: Stop Saying ‘Exponential.’ Sincerely, a Math Nerd.
2019/03/03 PMean: Slapping the word pilot on a failed study
2019/02/26 All scientific work is incomplete…
2019/02/15 PMean: Make a loud mistake
2019/02/14 Cartoon: Some good predictive analytics software…
2019/02/14 Recommendation: 8 Waste Types of DOWNTIME
2019/02/14 Recommendation: A Framework for Program Evaluation
2019/02/14 Recommendation: Checklist to Evaluate the Quality of Questions
2019/02/14 Recommendation: How to Use Deming’s 14 Points to Improve Quality
2019/02/14 Recommendation: Quality Improvement in Healthcare
2019/02/14 Recommendation: SMART Objectives
2019/02/13 Recommendation: NOVA, A Hole in the Sky
2019/02/12 Another short biography
2019/02/12 Recommendation: Dr. Russell Waitman. Innovation: Breaking the Barriers on Medical Information
2019/02/11 PMean: Finding those weird characters
2019/02/09 Recommendation: Create Awesome HTML Table with knitr::kable and kableExtra
2019/02/05 Recommendation: An overview of randomization techniques
2019/02/04 Recommendation: HEDIS and Performance Measurement
2019/02/04 Recommendation: The Learning Health Care System in America
2019/02/01 Recommendation: A Systematic Examination of the Citation of Prior Research
2019/02/01 The most challenging thing in the world…
2019/01/25 Recommendation: Bending the rules of clinical trials
2019/01/25 Recommendation: Competing commtments in clinical trials
2019/01/25 Recommendation: Observational studies often make clinical practice recommendations
2019/01/25 Recommendation: Sample applications and more
2019/01/25 Recommendation: Should you blow the whistle?
2019/01/25 Recommendation: Sins against science
2019/01/23 PMean: Think positively - what has research done for us
2019/01/23 Recommendation: Framingham Contribution to Cardiovascular Disease
2019/01/20 Exploratory data analysis is an attitude…
2019/01/20 In a world where the price of calculation continues to decrease rapidly…
2019/01/16 Recommendation: How to write a literature review
2019/01/15 PMean: Citing one of my web pages
2019/01/14 Recommendation: Hints for designing effective questionnaires
2019/01/14 Recommendation: Leading Questions – Yes Prime Minister
2019/01/09 Recommendation: How a Feel-Good AI Story Went Wrong in Flint
2019/01/09 Recommendation: Making women in science visible
2018/12/31 Recommendation: Congratulations on the Promotion. But Did Science Get a Demotion?
2018/12/30 Recommendation: Convert PowerPoint Slides to xaringan (remark.js) Slides
2018/12/29 Recommendation: 9 Reasons Excel Users Should Consider Learning Programming
2018/12/29 Recommendation: We Have Ways To Stop Rogue Scientists. They Don’t Always Work.
2018/12/11 Recommendation: In UC’s battle with the world’s largest scientific publisher, the future of information is at stake
2018/12/11 Recommendation: Standardized Mortality Ratio
2018/12/05 Recommendation: Make PowerPoint Presentations with R Markdown
2018/11/27 Recommendation: Welcome to DASL – The Data And Story Library
2018/11/11 PMean: Getting R to shut the heck up
2018/11/08 Recommendation: Installing R and Python in Anaconda for Biologists
2018/10/30 PMean: Fighting SASism
2018/10/23 Recommendation: 1.1 Billion Taxi Rides with Spark 2.2 & 3 Raspberry Pi 3 Model Bs
2018/10/23 Recommendation: Accessible R Markdown Documents
2018/09/24 Recommendation: A top Cornell food researcher has had 13 studies retracted. That’s a lot.
2018/09/23 Recommendation: Call R from SPSS
2018/09/21 PMean: What to do about claims of borderline statistical significance
2018/09/19 PMean: What I did in the last twelve months
2018/09/14 Recommendation: False-Positive Psychology
2018/09/14 Recommendation: Making it easier to discover data sets
2018/09/13 Recommendation: Complex Innovative Trial Designs Pilot Program
2018/09/13 Recommendation: Next-generation phenotyping of electronic health records
2018/09/13 Recommendation: Use of Electronic Health Record Data in Clinical Investigations. Guidance for Industry
2018/09/10 PMean: Super Pi, a group to teach cluster computing using the Raspberry Pi
2018/09/07 Recommendation: JupyterLab is Ready for Users
2018/09/07 Recommendation: lavaan tutorial
2018/09/07 Recommendation: Leaflet - an open source Javascript library for mobile-friendly interactive maps
2018/09/07 Recommendation: The five safes, designing data access for research
2018/09/04 PMean: Python, Raspberry Pi, and cluster computing
2018/09/04 Recommendation: Python bindings for MPI
2018/09/01 Recommendation: Cluster Hat 2.0
2018/08/31 Recommendation: MPI Tutorial Introduction
2018/08/28 Recommendation: r2d3: R Interface to D3 Visualizations
2018/08/27 PMean: What day is it in my R program?
2018/08/17 PMean: Business essentials for starting an independent consulting practice
2018/08/15 Recommendation: How to Clone Your Raspberry Pi SD Cards With Windows
2018/08/15 Recommendation: NOOBS – Raspberry Pi documentation
2018/08/13 PMean: The Dark Side of Data Science
2018/08/01 Recommendation: GloVe word vector embeddings
2018/08/01 Recommendation: Practical deep learning for coders
2018/07/24 PMean: A simple structure for documentation
2018/07/23 Recommendation: Use of Electronic Health Record Data in Clinical Investigations
2018/07/20 PMean: Grading rubric for computer assignments
2018/07/20 Recommendation: A Review of Published Analyses of Case-Cohort Studies and Recommendations for Future Reporting
2018/07/10 Recommendation: How to be more effective in your professional life
2018/07/07 PMean: How much missingness can you tolerate?
2018/07/05 Recommendation: Bayesian meta-analysis of two proportions in random control trials
2018/07/03 Recommendation: Section 508 CoP: PDF Accessibility – Part One
2018/06/28 Recommendation: Microsoft is creating an oracle for catching biased AI algorithms
2018/06/24 PMean: What goes into a contract for a consultation
2018/06/09 PMean: Big data groups at UMKC and UM/Columbia
2018/05/22 Recommendation: Analysis of Pretest-Postest Designs
2018/05/22 Recommendation: Applied Survival Analysis
2018/05/21 Recommendation: Interval regression - R data analysis examples
2018/05/20 Recommendation: Adjusted survival curves
2018/05/17 PMean: What are we doing to justify all that time we’re budgeting?
2018/05/13 PMean: Some interesting quality improvement resources
2018/05/13 Recommendation: beepr: easily play notification sounds on any platform
2018/05/13 Recommendation: Reproducible research with Stata
2018/05/10 PMean: Draft policy on statistical support for research
2018/05/01 PMean: Learning more about SAS
2018/04/19 Recommendation: A crummy drop-down menu appeared to kill dozens of mothers in Texas.
2018/04/19 Recommendation: Dogs vs cats. Create an algorithm to distinguish dogs from cats
2018/04/19 Recommendation: SMS Spam Collection Data Set
2018/04/11 Recommendation: Definitions of Criteria and Considerations for Research Project Grant Critiques
2018/04/10 Recommendation: Data Sharing Network (SHRINE)
2018/04/10 Recommendation: Exploits of a Mom
2018/04/09 Recommendation: ISO 8601
2018/04/05 Recommendation: TinyTeX: A lightweight - cross-platform - portable - and easy-to-maintain LaTeX distribution based on TeX Live
2018/04/03 Recommendation: EuSpRIG horror stories.
2018/04/03 Recommendation: Guidelines for estimating biostatistician effort and resources on grants
2018/04/03 Recommendation: Statistical and Machine Learning forecasting methods: Concerns and ways forward
2018/04/03 Recommendation: The Reinhart-Rogoff error – or how not to Excel at economics
2018/04/02 PMean: Developing an interdisciplinary research program
2018/04/02 PMean: My research interests
2018/04/02 PMean: My research interests, one page limit
2018/04/02 Pmean: My teaching and research statement
2018/04/02 PMean: My teaching approach
2018/04/02 PMean: My teaching interests, one page limit
2018/04/01 Recommendation: To combat physician burnout and improve care, fix the electronic health record
2018/03/29 PMean: Starting a heron-i2b2-analytics repository
2018/03/29 Recommendation: Evaluation Methods in Biomedical Informatics
2018/03/28 PMean: And the least important variable is…
2018/03/28 PMean: Recommended format for homework assignments
2018/03/28 PMean: Using the transpose procedure in SAS
2018/03/27 PMean: Next stop - BMC Medical Informatics and Decision Making
2018/03/27 Recommendation: Good Publication Practice for Communicating Company-Sponsored Medical Research: GPP3
2018/03/25 PMean: Two articles published in the Encyclopedia of Big Data
2018/03/24 Recommendation: Textbook Examples Applied Survival Analysis
2018/03/23 PMean: Exporting a graph in SAS
2018/03/23 PMean: Tests of equivalence and non-inferiority
2018/03/23 PMean: They want a short biography from me
2018/03/23 Recommendation: Getting Started with the SAS 9.4 Output Delivery System
2018/03/23 Recommendation: Welcome to developerWorks
2018/03/22 PMean: Mining the electronic health record, why and how
2018/03/22 PMean: Peer grading in Introduction to R - SPSS - SAS
2018/03/21 PMean: Changes to the Introduction to R - SAS - and SPSS classes
2018/03/01 Recommendation: Is vaccine effectiveness (VE) different from vaccine efficacy
2018/02/28 Recommendation: A sampling of outstanding women in analytics
2018/02/24 Recommendation: Data dictionaries
2018/02/24 Recommendation: The history of Hadoop
2018/02/20 Recommendation: Adherence to Methodological Standards in Research Using the National Inpatient Sample
2018/02/06 Recommendation: An introduction to implementation science for the non-specialist
2018/01/30 Recommendation: The Survey Statistician newsletter
2018/01/23 Recommendation: Hi - I’m Mike Bostock.
2018/01/02 Recommendation: Philosophy News Network: Postmodernism Special Report
2018/01/02 Recommendation: The Origins of ‘Big Data’
2017/12/27 Recommendation: Designing and conducting semi-structured interviews for research
2017/12/15 Recommendation: No more rainbows
2017/12/12 Recommendation: Network analysis in cross-sectional data using R
2017/12/04 Recommendation: How to use social media in your career
2017/11/27 Recommendation: Can A.I. be taught to explain itself
2017/11/15 Recommendation: beanumber repository
2017/11/15 Recommendation: Databases using R
2017/11/15 Recommendation: Intro to SQL for Data Science
2017/11/15 Recommendation: Teaching precursors to data science in introductory and second courses in statistics
2017/11/08 Recommendation: Writing about numbers
2017/10/19 Recommendation: When the revolution came for Amy Cuddy
2017/10/17 Recommendation: Get credit for your data – BMC Research Notes launches data notes
2017/10/17 Recommendation: Search for unpublished data by systematic reviewers: an audit
2017/09/28 Recommendation: OpenRefine: A free, open source, powerful tool for working with messy data
2017/09/25 Recommendation: How to increase value and reduce waste when research priorities are set
2017/09/20 Recommendation: Randomized Controlled Trials in Health Insurance Systems
2017/09/14 Recommendation: Announcing a new monthly feature: What’s going on in this graph
2017/09/13 Recommendation: Notice of Revised NIH Definition of Clinical Trial
2017/09/13 Recommendation: Trump’s Android and iPhone tweets - one year later
2017/09/05 Recommendation: Good enough practices in scientific computing
2017/08/16 Recommendation: Dryad Digital Repository
2017/07/12 Recommendation: Analyze Survey Data for Free
2017/07/12 Recommendation: Greece’s troubling prosecution of its former chief statistician
2017/07/10 Recommendation: Is the staggeringly profitable business of scientific publishing bad for science?
2017/06/26 Recommendation: The new Enigma Public
2017/06/19 Recommendation: Kaggle data
2017/06/16 Recommendation: Five Thirty Eight Data
2017/06/13 A Quick Note on Two Beautiful Websites
2017/06/12 Recommendation: ProbOnto
2017/05/18 Recommendation: This is your machine learning system?
2017/05/18 Recommendation: Why R is Bad for You
2017/05/05 Recommendation: One in Five Clinical Trials for Adults with Cancer Never Finish
2017/05/04 Recommendation: The numbers for the Science March…
2017/05/02 Recommendation: ROSE: A package for binary imbalanced learning
2017/04/27 Recommendation: Proving the null hypothesis in clinical trials
2017/04/13 Recommendation: Genetics: Clues in the code
2017/04/13 Recommendation: How Bright Promise in Cancer Testing Fell Apart
2017/04/13 Recommendation: Standards and guidelines for the interpretation of sequence variants
2017/04/11 Recommendation: Blind analysis: Hide results to seek the truth
2017/04/10 Recommendation: Launch a Shiny App on Your Own Server in 4 Steps
2017/04/07 PMean: Obnoxious use of red text in RStudio
2017/04/04 Recommendation: Why be an independent consultant?
2017/03/24 Recommendation: PheKB. A knowledge base for discovering phenotypes from electronic health records
2017/03/23 Recommendation: Medicare Claims Synthetic Public Use Files (SynPUFs)
2017/03/12 Recommendation: Conducting Clinical Research
2017/02/23 Recommendation: Text Mining with R
2017/02/02 Recommendation: R and SQL Server 2016
2017/01/30 Recommendation: i2b2 Design Document. Ontology Management (ONT) Cell
2017/01/30 Recommendation: TSHS Resource Portal
2017/01/24 Recommendation: Guidelines for Assessment and Instruction in Statistics Education College Report 2016
2017/01/24 Recommendation: Statistical Issues Seen in Non-Statistics Proposals
2016/12/02 Recommendation: Defining Urban and Rural Areas in U.S. Epidemiologic Studies
2016/11/10 Recommendation: Practical advice for analysis of large, complex data sets
2016/10/20 Recommendation: A Tutorial on Loops in R
2016/10/20 Recommendation: Where Do You Run Your R Scripts?
2016/10/18 Recommendation: Oracle Dates and Times
2016/09/28 Recommendation: Published methodological quality of randomized controlled trials does not reflect the actual quality assessed in protocols
2016/09/23 PMean: By the skin of my teeth
2016/09/06 Recommendation: Diverse Perspectives on a Flipped Biostatistics Classroom
2016/09/01 Recommendation: Organizing data in spreadsheets
2016/09/01 Recommendation: What I need from statisticians
2016/08/25 Recommendation: The FAIR Guiding Principles for scientific data management and stewardship
2016/08/15 Recommendation: 10 Easy Steps to a Complete Understanding of SQL
2016/08/15 Recommendation: Tibbles (Tibbles are a modern take on data frames)
2016/08/08 PMean: Changing the font size in R
2016/08/08 PMean: Changing the font size in RStudio
2016/08/07 Recommendation: dplyr and pipes: the basics
2016/08/07 Recommendation: Hadley Wickham - the Man Who Revolutionized R
2016/08/03 Recommendation: Enrichment design studies should enhance signals of effectiveness.
2016/08/03 Recommendation: The Importance of Reproducible Research in High-Throughput Biology
2016/06/26 Recommendation: 100+ Interesting Data Sets for Statistics
2016/06/24 Recommendation: Institute for Digital Research and Education - Statistical Computing
2016/06/15 Recommendation: Handling date-times in R
2016/04/28 Recommendation: Bayesian computing with INLA
2016/04/18 Recommendation: Interpretation of Changes in Health-related Quality of Life: The Remarkable Universality of Half a Standard Deviation
2016/04/10 PMean: Some open source Kaplan Meier curves
2016/03/30 Recommendation: Reporting and methodological quality of sample size calculations in cluster randomized trials could be improved: a review
2016/03/30 Recommendation: The number of subjects per variable required in linear regression analyses
2016/03/08 Recommendation: PLOS ONE 2015 Reviewer Thank You
2016/02/29 Recommendation: Selection of controls in case-control studies
2016/02/05 PMean: Calculating power for a test of association in a two by two table
2016/02/05 PMean: Simulating power for a test of association in a two by two table
2016/02/03 Recommendation: The Survey Statistician
2016/01/25 Recommendation: The Coin Flip: A Fundamentally Unfair Proposition
2016/01/25 Recommendation: The Empirical Evidence of Bias in Trials Measuring Treatment Differences
2016/01/19 Recommendation: ENCODE: Encyclopedia of DNA Elements
2016/01/13 PMean: My book chapter on R
2016/01/13 Recommendation: Lyndon B. Johnson Space Center job opening for a GS-14 Statistician
2016/01/06 Recommendation: A Grant Submission New Year’s Resolution
2015/12/20 Recommendation: Points to consider on switching between superiority and non-inferiority
2015/12/07 Recommendation: Differences between information in registries and articles did not influence publication acceptance
2015/12/07 Recommendation: The COMPare Project
2015/12/02 PMean: A book review of my first book
2015/12/02 Recommendation: Safeguarding Patients in Clinical Trials with High Mortality Rates
2015/11/16 PMean: My Google Scholar profile
2015/10/13 PMean: How many research subjects…
2015/09/24 Recommendation: PS: Power and Sample Size Calculation
2015/09/16 Recommendation: Research vs Quality Improvement
2015/08/20 Recommendation: R number 6 in IEEE 2015 Top Programming Languages, Rising 3 Places
2015/06/30 Recommendation: This is Statistics promotional toolkit
2015/06/03 PMean: My research contributions to Evidence Based Medicine
2015/06/03 PMean: My research contributions to patient accrual models
2015/05/30 PMean: My research contributions to numerical accuracy
2015/05/30 PMean: My research contributions to reproductive toxicology
2015/05/27 PMean: I am now a number in the ORCID database
2015/05/26 Recommendation: Developing Grant Proposals: Guidelines for Statisticians Collaborating Under Limited Resources
2015/05/20 Recommendation: PLOS ONE 2014 Reviewer Thank You
2015/04/30 Recommendation: An Introduction to Social Media for Scientists
2015/04/30 Recommendation: Beyond Bar and Line Graphs: Time for a New Data Presentation Paradigm
2015/04/30 Recommendation: Improving Bioscience Research Reporting: The ARRIVE Guidelines for Reporting Animal Research
2015/04/16 Recommendation: Restoring invisible and abandoned trials
2015/04/12 PMean: Equations using MathType
2015/04/03 PMean: Examining relationships in R
2015/02/24 Recommendation: Editorial (Basic and Applied Social Psychology)
2015/02/24 Recommendation: Rich Data, Poor Data
2015/02/03 Recommendation: New R Package: cdcfluview
2015/02/03 Recommendation: P-Values
2015/01/15 Recommendation: The answer is 17 years, what is the question. Understanding time lags in translational research
2015/01/12 Recommendation: Tessera. Open source environment for deep analysis of large complex data
2015/01/08 Recommendation: Transparent reporting of a multivariable prediction model for individual prognosis or diagnosis (TRIPOD): the TRIPOD Statement
2014/12/23 Recommendation: Report on Survey Participation Refusals
2014/12/11 Recommendation: In search of justification for the unpredictability paradox
2014/12/10 Recommendation: Requiring fuel gauges. A pitch for justifying impact evaluation sample size assumptions
2014/11/24 Recommendation: What Teachers Should Know about the Bootstrap: Resampling in the Undergraduate Statistics Curriculum
2014/11/01 PMean: Cox regression in R
2014/11/01 PMean: More Kaplan-Meier curves in R
2014/10/31 PMean: Kaplan-Meier curves in R
2014/08/19 Recommendation: Communicating Statistical Findings to Consulting Clients Operating in a Decisionmaking Climate: Best and Worst Practices
2014/08/13 Recommendation: Sample size of 12 per group rule of thumb for a pilot study
2014/07/24 PMean: What is the probability of a probability of one
2014/07/22 PMean: An example of a simple sample size justification
2014/07/14 Recommendation: Special issue–Using Big Data to Transform Care
2014/06/16 Recommendation: MLPowSim software
2014/06/10 Recommendation: Comparisons within randomised groups can be very misleading
2014/05/31 PMean: What should go into a data codebook
2014/05/30 Recommendation: FDA: R OK for drug trials
2014/05/06 Recommendation: A review of methods for missing data
2014/05/05 Recommendation: Meet John Gawalt, Director of the National Center for Science and Engineering Statistics
2014/05/03 PMean: Using BUGS within the R programming environment
2014/05/01 Recommendation: Data doesn’t speak for itself
2014/05/01 Recommendation: Not all scientific studies are created equal
2014/04/28 Recommendation: The random risks of randomised trials
2014/04/14 PMean: Using statistical design principles to plan a Monte Carlo analysis – part 2
2014/04/08 Recommendation: More on Big Data Training for the Scientific Workforce
2014/04/06 Recommendation: Predicting clinical trial results based on announcements of interim analyses
2014/03/12 PMean: Estimating the efficiency of a completely randomized block design
2014/03/05 Recommendation: foreach: Foreach looping construct for R
2014/03/05 Recommendation: Meet Charles J. Rothwell, Director, National Center for Health Statistics
2014/03/05 Recommendation: Qualifications for Teaching an Introductory Statistics Course
2014/02/26 Recommendation: plotrix: Various plotting functions
2014/02/25 Recommendation: A guide to the line style arguments for R graphics
2014/02/24 PMean: NIH is interested in big data
2014/02/20 Recommendation: Why Coincidences, Miracles And Rare Events Happen Every Day.
2014/02/10 Recommendation: Why randomized controlled trials fail but needn’t: 2. Failure to employ physiological statistics, or the only formula a clinician-trialist is ever likely to need (or understand!)
2014/02/03 Recommendation: Troubleshooting Public Data Archiving: Suggestions to Increase Participation
2014/01/29 Recommendation: Will 2015 be the Beginning of the End for SAS and SPSS?
2014/01/24 Recommendation: The Next Billionaire: A Statistician Who Changed Medicine.
2014/01/17 Recommendation: Large randomized controlled trials are ready for retirement
2014/01/15 PMean: Resources for a workshop in R
2014/01/15 Recommendation: Statistics Attitude Survey scale
2014/01/13 Recommendation: Git can facilitate greater reproducibility and increased transparency in science
2014/01/09 Recommendation: What’s so good about early anyway.
2013/12/20 Recommendation: Comparison of Logistic Regression versus Propensity Score When the Number of Events Is Low and There Are Multiple Confounders
2013/12/18 PMean: Sample size for comparing two diagnostic tests
2013/12/12 Recommendation: DataMind website
2013/12/12 Recommendation: Study Development (Kansas City area resource)
2013/12/10 PMean: Claims lacking specificity are meaningless
2013/12/09 PMean: Is Possibility Theory better than Probability Theory?
2013/12/09 Recommendation: Use equal sign for assignmentin R?
2013/12/05 Recommendation: Any other comments? Open questions on questionnaires. A bane or a bonus to research?
2013/12/04 PMean: The cost of a bad prediction
2013/12/03 Recommendation: How confidence intervals become confusion intervals.
2013/12/02 Recommendation: The riddle of experience vs. memory
2013/11/30 PMean: You can now register for an account on my blog.
2013/11/29 PMean: Two questions you should always ask at the end of a consulting session
2013/11/29 Recommendation: Row over breast cancer screening shows that scientists bring some subjectivity into their work.
2013/11/28 Recommendation: Revised standards for statistical evidence
2013/11/27 PMean: Blog is up and ready for testing
2013/11/27 Recommendation: Twenty tips for interpreting scientific claims
2010/07/26 When should research in a given area end?
2010/01/01 Lessons learned the hard way. Don’t …
2010/01/01 My life so far, fails to meet expectations
2010/01/01 What is a good surrogate measure for …
2009/01/01 (Being updated)
2009/01/01 A simple example of joint and …
2009/01/01 A sportswriter tackles the Monty Hall problem
2009/01/01 Acknowledging the …
2009/01/01 Analyzing bad data
2009/01/01 Are we statisticians gods?
2009/01/01 Calculating NNT for …
2009/01/01 Calculating NNT for infection rates
2009/01/01 Calibrating information …
2009/01/01 Can I stop this study?
2009/01/01 Can I use you as a teaching example?
2009/01/01 Changes in the adjusted hazard …
2009/01/01 Data layout for an ROC curve
2009/01/01 Developing a website logo
2009/01/01 DNA binding image
2009/01/01 Do multiple time points require …
2009/01/01 Drawing simple mathematical graphs
2009/01/01 Entering and analyzing data from a two by two table
2009/01/01 Fewer than 10 events per variable
2009/01/01 Five points or seven points on a …
2009/01/01 Formula for multiple imputation
2009/01/01 Generating multinomial random …
2009/01/01 Getting a good cut-off …
2009/01/01 Good papers for a journal club
2009/01/01 I love to write
2009/01/01 Institute of Medicine report on conflict …
2009/01/01 Interpreting a negative autocorrelation
2009/01/01 Is this a case-control design?
2009/01/01 Jump start statistics for beginning …
2009/01/01 Locating individual points on an ROC curve
2009/01/01 Maybe Powerpoint isn’t so bad
2009/01/01 New Bioinformatics degree
2009/01/01 NYTimes advice on increasing website traffic
2009/01/01 Power for a three arm experiment
2009/01/01 Randomly generating simple math …
2009/01/01 Rotating locations …
2009/01/01 Short biography
2009/01/01 Sneaking ineligible patients …
2009/01/01 Standard error for an odds ratio
2009/01/01 Tentative training schedule
2009/01/01 The controversy over …
2009/01/01 The first three steps in …
2009/01/01 The perils of self-evaluation
2009/01/01 The problem with being too sensitive
2009/01/01 The surprisal matrix and …
2009/01/01 Two business contacts
2009/01/01 Use of Likert data with ANOVA
2009/01/01 What is a normal probability plot?
2009/01/01 What is the effect of an unmeasured covariate?
2008/08/05 Reporting of adverse events
2008/06/20 Bootstrap estimates of the standard error
2008/06/17 Can I run a quantitative analysis on this data?
2008/06/17 Running R on a web server
2008/06/14 Criticism of random effects in a meta-analysis
2008/06/14 Modeling a declining count variable
2008/06/07 Eliciting a prior distribution for rejection/refusal rates
2008/06/05 When does heterogeneity become a concern?
2008/06/05 Why it's impossible to keep a resume current
2008/05/27 How wide can you make a line of your web page?
2008/05/09 A short biography that can be used as an introduction
2008/05/08 Why does a Bayesian approach make sense for monitoring accrual?
2008/05/07 Slipped deadlines and sample size shortfalls in a random sample of research studies
2008/05/01 Monitoring refusals and exclusions in a clinical trial
2008/04/23 Evidence Based Medicine for patients
2008/04/14 A brief overview of instrumental variables
2008/04/06 A simple math error
2008/04/06 What does one-third of the way through a study mean?
2008/04/04 Calculating statistics on whole numbers
2008/04/03 An alternative to the p-value
2008/04/03 Why we need case studies of research ethics in graphic novel format
2008/03/29 What sort of statistical training is needed for basic scientists?
2008/03/24 Presenting unadjusted and adjusted estimates side by side
2008/03/24 When a client asks for a bad analysis
2008/03/12 Moving content to a private site
2008/03/12 Simplifying repeated measurements
2008/03/05 Losing web pages in the mass of information
2008/03/03 Calculating NNT for observational studies
2008/02/25 Assessing the assumption of an exponential distribution
2008/02/22 What is a critical value?
2008/02/13 Multiple methods for computing percentiles
2008/01/24 A simple example of a Kaplan-Meier curve
2008/01/22 How do you analyze safety data
2008/01/21 Finding only the important studies
2008/01/18 What have you changed your mind about
2008/01/09 Too much power and precision?
2008/01/07 The post-modern assault on evidence-based medicine, part 3
2008/01/04 What statistic should I use when?
2008/01/03 Type III error
2008/01/01 A misleading bar graph
2008/01/01 A simple Bayesian model for
2008/01/01 Anti-intellectualism …
2008/01/01 Business aspects of an independent …
2008/01/01 Calculating statistics on whole numbers
2008/01/01 Cytel software has developed a Poisson …
2008/01/01 Defending Bonferroni
2008/01/01 Difficulties in generalizing …
2008/01/01 Directions to my new office
2008/01/01 Distrust of a Bayesian …
2008/01/01 Getting on and off various email lists
2008/01/01 Hire me as a consultant
2008/01/01 How do I fit a piecewise linear …
2008/01/01 How many files …
2008/01/01 How to report a one-tailed Fisher’s Exact Test
2008/01/01 I hate bad research examples
2008/01/01 Is there a scientific basis for EBM?
2008/01/01 New format for articles, books, and websites
2008/01/01 New personal pages
2008/01/01 Nomination for the Kreamer Award
2008/01/01 Pearson correlation and ordinal data
2008/01/01 Plug for accrual research
2008/01/01 Reading abstracts instead of the full paper
2008/01/01 Reliable diagnosis of cataracts
2008/01/01 Reliable diagnosis of cataracts
2008/01/01 Should I abandon FrontPage?
2008/01/01 Software for bootstrap and …
2008/01/01 Statistics for Boards
2008/01/01 Survey results from nine out of thirty six
2008/01/01 Undeclared missing code leads …
2008/01/01 What distribution does this data …
2008/01/01 What does the FDA think about Bayesian …
2008/01/01 Where can I learn more about Statistics?
2008/01/01 Why does a Bayesian approach make …
2007/12/28 Who wrote the law that mandates PowerPoint?
2007/12/12 A Poisson regression model with interactions
2007/11/28 No longer the sole statistician?
2007/11/26 Testing for an increasing trend in a proportion
2007/11/19 Tracking adverse events during kidney biopsy
2007/11/19 What, exactly, is a child?
2007/11/18 Tracking central line infections over time
2007/11/17 My page names are too long
2007/11/15 Monitoring adverse events during peritoneal dialysis
2007/11/15 Monitoring adverse events during peritoneal dialysis
2007/11/15 Stair step interpolation in R
2007/11/12 NNH talk update
2007/11/12 Reforming conflict of interest statements
2007/11/11 Postlude to my Dallas talk
2007/11/08 Grow up and learn how to do Statistics
2007/11/06 Handout for diagnostic testing
2007/10/18 New categories needed
2007/10/18 Revising my definition section
2007/10/10 Confidence interval for a rate
2007/10/09 Case study of accrual in a clinical trial, part 2
2007/10/05 Seminar on Open Access Journals
2007/10/04 Educational and networking opportunities for statisticians in the Kansas City area
2007/10/03 An alternate way of viewing accrual
2007/10/01 Help for Statistics at UMKC and KUMC
2007/09/27 Alphabetical bookmark list
2007/09/27 Html debris copied from other websites
2007/09/27 The latest word on my promotion
2007/09/21 Patterns to look for in a histogram
2007/09/17 What does a statistician do all day?
2007/09/14 How many webpages have I written?
2007/09/11 Case study of accrual in a clinical trial
2007/09/05 My promotion application
2007/09/04 Resources for grant writers
2007/08/30 Are we assuming a normal sample or a normal population?
2007/08/29 What makes pediatric research different?
2007/08/22 Analyzing data from a simple crossover design
2007/08/22 Common sources of confusion in a class on quality control
2007/08/21 Accrual grant, Round 3
2007/08/13 Does promoting your book constitute a conflict of interest?
2007/08/13 How good is my prediction?
2007/08/09 Justifying the sample size for a microarray study
2007/08/09 Need for a conflict of interest policy
2007/08/03 Which expert should you believe?
2007/07/26 Should I use the heteroscedastic t-test?
2007/07/24 Continuing education questions for a talk on diagnostic tests
2007/07/20 Classic calculations for a diagnostic test
2007/07/18 Conflict of interest list
2007/07/18 I don’t want to use a randomized trial
2007/07/12 Code for drawing new likelihood ratio slide rule
2007/07/07 The research world is not black and white
2007/07/02 Recommendations from Sackett et al for evaluating a diagnostic test
2007/06/29 The stubborn insistence on placebos
2007/06/28 How two bad control groups can add up to one good comparison
2007/06/28 How two bad control groups can add up to one good comparison
2007/06/27 The debate about historical control groups
2007/06/25 The trouble with apples and oranges
2007/06/22 Can the standard deviation be more than half of the range?
2007/06/22 I deserve a promotion
2007/06/22 Why the plus one in the percentile formula?
2007/06/15 Use of diagnostic tests for making clinical decisions
2007/06/15 When bad control groups happen to good researchers
2007/06/14 Seven different formulas for the odds ratio
2007/06/14 Seven different formulas for the odds ratio
2007/06/13 Accounting for cyclical trends in a regression model
2007/06/11 Illustrated case studies of research ethics and research fraud
2007/06/08 Centering the data
2007/06/04 Calculating probabilities involving correlated normal variables
2007/06/01 Applying likelihood ratios in your head
2007/05/29 May has been a slow month
2007/05/16 Choosing between two conflicting analyses
2007/05/16 Classic references in evidence based medicine
2007/05/02 What to measure in a post-marketing surveillance study
2007/05/02 Where can you find interesting case studies in Statistics?
2007/04/26 Cohen's Kappa with small cell sizes
2007/04/21 ANOM table for alpha=0.05, part 2
2007/04/17 Fitting a beta binomial model using BUGS
2007/04/13 A simple illustration of the Metropolis algorithm
2007/04/11 Special section for quotations
2007/04/11 When I talk about statistics …
2007/04/10 IRB review of studies with methodological flaws
2007/04/10 Quantifying the ability of dreams to predict the future
2007/04/09 One of the naturalists had argued that …
2007/04/09 What is an adequate sample size for establishing validity and reliability?
2007/04/06 Calculating rates
2007/04/06 useR! 2007 conference in Ames, Iowa
2007/04/06 What makes a good diagnostic test?
2007/04/05 Further explanation about Type I and Type II errors
2007/04/05 Tracking adverse events during kidney biopsy, Part 2
2007/04/04 The Seven Deadly Sins of Researchers
2007/03/28 Reporting data analysis on transformed data
2007/03/27 R Wiki
2007/03/26 IRB review of a pilot study
2007/03/22 Confidence intervals for count data
2007/03/22 Some UNIX humor
2007/03/21 Interpretation of an odds ratio
2007/03/18 What I’m working on right now
2007/03/16 Randomly dividing a dataset in R
2007/03/15 Bad calculation of annual rate of return
2007/03/14 Thanks to all my proofreaders!
2007/03/14 Tracking adverse events during kidney biopsy
2007/03/13 Ignore weak evidence at your own peril
2007/03/11 Reviewing a paper on qualitative data analysis
2007/03/08 How to draw a fishbone diagram
2007/03/07 Calculating a P control chart
2007/03/07 P control chart, answers to on your own exercises
2007/03/06 Analysis of Means answers to on your own exercises
2007/03/06 Calculation of Analysis of Means limits
2007/03/05 Review of statistical methods in The New England Journal of Medicine and Nature Medicine
2007/03/04 ANOM table for alpha=0.05, part 1
2007/03/02 Analysis of Means calculations
2007/03/02 Calculating an XBAR-S control chart
2007/03/02 Handouts for quality control workshop
2007/03/02 XBAR-S control chart, answers to on your own exercise
2007/03/01 Using a pocket calculator to compute a standard deviation
2007/02/28 Team exercise to illustrate ANOM calculations
2007/02/19 Formulas for cumulative Poisson and binomial probabilities
2007/02/15 A recent contribution to Wikipedia and to the Chance Wiki
2007/02/15 Three simple rules to establish quality
2007/02/14 Watch out for ambiguous data
2007/02/11 Advice for searching in PubMed
2007/02/11 Compound interest and powers
2007/02/08 Resources for fMRI data analysis
2007/02/06 When is a control chart not a control chart?
2007/02/01 Modular arithmetic and rounding in R
2007/01/31 The danger of providing expert testimony when you are not an expert
2007/01/30 Do your own power and sample size calculations
2007/01/26 Fitting a difference in exponential functions
2007/01/23 Manipulating graphic images using a touchscreen interface
2007/01/19 Books that discuss Poisson regression
2007/01/18 Tests of hypothesis and confidence intervals involving a correlation coefficient
2007/01/15 Resources describing biplots
2007/01/12 What can you do with 100 words?
2007/01/09 Differences between the Chi-square test, Fisher's Exact test, and logistic regression
2007/01/03 Variable cluster sizes and their impact on sample size calculations
2006/12/29 Be sure to account for dropouts in your sample size calculation
2006/12/29 What percentage of medical decisions are based on good evidence?
2006/12/20 Cherry picking the literature
2006/12/18 Unusual advice about control charts
2006/12/14 Should/Can Statistical Consultants, be Independent?
2006/12/14 Using focus groups to bridge the gap between research and practice
2006/12/13 Evidence-based development of medical guidelines
2006/12/13 Mathematical and statistical challenges
2006/12/12 Perfect isn't quite good enough
2006/12/06 PharmaIQ talks
2006/12/04 When are two events worrisome?
2006/11/21 Manipulation of peer-review publications by pharmaceutical companies
2006/11/17 A simple Bayesian model for accrual
2006/11/17 The tension between scientific validity and ethical concerns
2006/11/16 Fitting a quadratic regression model
2006/11/16 The complexities of having a variable number of measures per patient
2006/11/14 The danger of using humor on a web page
2006/11/09 Incorporating risk factors into diagnostic test calculations
2006/11/07 Rebutting an expert reviewer
2006/11/07 Technical Articles and Reports by David Heiser
2006/11/06 Materials for Signal Detection and Data Mining Strategies conference
2006/11/06 Medline is a very busy place
2006/11/02 Additions and improvements to my web pages
2006/11/02 Statistical concerns in research studies involving children
2006/10/27 Parametric tests for a ratio
2006/10/26 Adjusting a variable for age and sex
2006/10/26 Searching for pediatric articles on Medline
2006/10/23 Is a 10% shortfall in sample size critical?
2006/10/18 A simple example of a mixed linear regression model
2006/10/17 Ethical concerns about research in children
2006/10/16 Case studies for differences in research in children
2006/10/16 Mathematical derivation of the odds form of Bayes theorem
2006/10/13 Differences between children and adults
2006/10/10 Frank Harrell's Philosophy of Biostatistics
2006/10/05 Book reviews for Statistical Evidence
2006/10/02 My second grant, part 3
2006/09/25 Improvements to weblog categories
2006/09/21 Is my confidence interval too wide?
2006/09/19 Two talks for PharmaIQ
2006/09/18 Oops! I found statistical significance in my pilot study
2006/09/15 Resources for the use of Statistical Process Control in Healthcare
2006/09/15 Special issues for research involving children
2006/09/14 Pharmacogenetics Research Network
2006/09/13 Ambiguous nature of the word "risk"
2006/09/13 Email discussion groups
2006/09/13 My second grant, part 2
2006/09/12 Graphics options in R
2006/09/07 Postmodern thought and evidence based medicine
2006/09/07 Rules for rounding numbers
2006/09/02 Continuous monitoring of the number needed to harm
2006/08/31 Changing page breaks in SPSS
2006/08/29 Wikipedia entry on Binomial Confidence Interval, Part 3
2006/08/25 Citing statistical software in research papers
2006/08/22 Wikipedia entry on Binomial Confidence Interval, Part 2
2006/08/20 Quality control humor
2006/08/18 An exact confidence interval for a binomial proportion
2006/08/16 More than one thousand web pages now available on my site
2006/08/15 American Statistical Association Traveling Course committee
2006/08/03 When should you worry about recall bias?
2006/08/02 Sales figures for Statistical Evidence in Medical Trials
2006/07/28 R libraries for sample size justification
2006/07/26 My second grant
2006/07/25 Using a colloquial tone in a grant application
2006/07/18 Questions a volunteer should ask before participating in a clinical trial
2006/07/18 Selecting randomly from a list
2006/07/17 Seminar notes. Adjustments for multiple comparisons
2006/07/17 Seminar notes. Issues in the analysis of mixed linear models
2006/07/17 Seminar notes. Missing values in a dose response model
2006/07/17 Seminar notes. Working with molecular biologists
2006/07/12 Fraudulent images in research
2006/07/10
2006/07/06 Possible sources of funding for my grant
2006/07/05 Stopping rules for a Data Safety Monitoring Plan
2006/06/30 Some resources for Analysis of Means
2006/06/30 What is block randomization
2006/06/29 Likelihood software for clinical trials
2006/06/29 The problem with ranking ordinal scales
2006/06/28 Colors for R graphs
2006/06/28 Resources for Item Response Theory
2006/06/26 Slash and burn models
2006/06/23 Using a charge of fraud to achieve a political end
2006/06/20 Applications of the CUSUM chart
2006/06/20 Auditing for data entry errors
2006/06/20 Philosophy of teaching
2006/06/20 Putting a human face on Evidence Based Medicine
2006/06/20 Withholding Personal Health Information from a patient
2006/06/17 Seminar notes. Confidence intervals for a variance ratio
2006/06/07 New entry in the Chance Wiki
2006/06/05 An amusing correlation
2006/06/05 Seminar on control charts and adverse events
2006/05/31 Methods for haplotype analysis
2006/05/30 Interesting stuff for the month of May
2006/05/30 Monitoring accrual rates
2006/05/26 Relationship between the standard deviation and the sample size
2006/05/25 Upcoming talks about control charts
2006/05/24 Using APR-DRGs for risk adjustment
2006/05/24 You won't have Steve Simon to kick around anymore
2006/05/23 Another regular expression tip
2006/05/23 Can the p-value actually equal 1.0?
2006/05/23 Lost files
2006/05/18 Using regular expressions to insert line breaks
2006/05/17 Searching high level sources first
2006/05/10 Using a web site to promote your book
2006/05/08 Always ask why
2006/05/04 Data mining and drug safety
2006/05/04 What constitutes a conflict of interest?
2006/04/26 A simple application of propensity scores
2006/04/25 Surviving Statistical Spitting Matches
2006/04/19 Abstainer errors in study of alcohol abuse
2006/04/19 Giving credit where credit is due
2006/04/18 Univariate Model Based Clustering
2006/04/17 Placing the symbol X-bar in a document
2006/04/17 Three new koans
2006/04/17 Topic list is complete!
2006/04/12 Interesting websites, publications and quotes for the month of April
2006/04/11 The Healthcare Cost and Utilization Project
2006/04/04 Can you use the coefficient of determination for categorical variables?
2006/04/04 Interpretation of the correlation coefficient
2006/04/04 What is a beta coefficient?
2006/04/04 When is a co-authorship warranted?
2006/03/30 Articles on Bayesian data analysis
2006/03/30 Contradictory research
2006/03/30 How many charts should I pull?
2006/03/29 New koan page
2006/03/29 Proper treatment will cure a cold in seven days, but …
2006/03/29 Small sample size, yet again
2006/03/29 The role of a statistician on an IRB
2006/03/26 Statistical koan #4
2006/03/24 Examples of a fishbone diagram
2006/03/24 Seminar notes, Creating More Effective Graphics
2006/03/17 My ten favorite books, #10
2006/03/16 Crash Course in Spss for Windows
2006/03/16 Statistical koan #3
2006/03/15 Post hoc comparisons
2006/03/14 Software for structural equations models
2006/03/10 More on the Emily Rosa experiment
2006/03/10 Poisson regression? Maybe not!
2006/03/10 Propensity scores
2006/03/08 What is construct validity?
2006/03/06 Best EBM articles in 2005
2006/02/28 Statistical koan #2
2006/02/28 Update on my book, Statistical Evidence in Medical Trials
2006/02/27 Statistical koans
2006/02/15 Difficulties in generalizing research
2006/02/14 Meta-analysis and diagnostic tests
2006/02/13 Checking a Chi-square test
2006/02/13 What makes a good book? A sense of humor.
2006/02/03 Reporting serious adverse events
2006/02/01 An Ensembl search
2006/02/01 Learning more about control charts
2006/01/31 How do the various clustering algorithms work?
2006/01/31 More lessons learned the hard way
2006/01/31 Not everything that can be counted …
2006/01/31 Real-life examples of survey mistakes
2006/01/31 Recent developments in searching for evidence
2006/01/24 A simple function for a Biplot in R
2006/01/24 Machine Learning tools in R
2006/01/24 Randomization tests for paired data
2006/01/20 Multicollinearity is not a violation of assumptions
2006/01/19 Davis Balestracci seminar
2006/01/19 Excluding zip codes with insufficient data
2006/01/18 Categorizing my weblog entries
2006/01/18 The Journal of Statistical Software
2006/01/17 Characterizing reasons for refusal
2006/01/16 Handling dropouts in NNT/NNH calculations
2006/01/12 First peek at the cover of my new book
2006/01/11 Where to go, where to go
2006/01/09 Extreme value distribution
2006/01/05 An entry in Chance News
2006/01/04 The past year in my weblog
2005/12/21 Vote for me
2005/12/15 Confidence intervals are needed to evaluate clinical importance
2005/12/13 Fractions are funny
2005/12/13 Group Sequential Monitoring of Clinical Trials in R
2005/12/12 The HapMap project
2005/11/28 Withholding information
2005/11/25 Hard learned lessons
2005/11/25 Slow progress on my weblog
2005/11/25 Stepwise regression to screen for covariates
2005/11/17 Web page for Fisher’s Exact test
2005/11/02 Non-destructive data editing
2005/11/02 Seventeen years between research and practice
2005/10/24 A nice definition of anecdotal evidence
2005/10/24 RMA normalization of microarrays
2005/10/14 A totally negative microarray experiment
2005/10/14 The fate of retracted articles
2005/10/14 Two nice R libraries
2005/10/13 A nonspecific diagnostic test
2005/10/11 A simple trick in R
2005/10/10 Responding to a critique of meta-analysis
2005/10/05 Quality control exercises, Part 2
2005/10/03 Sample size for a binomial confidence interval
2005/09/19 An error slips through the peer review process
2005/09/15 All models are …
2005/09/15 Dishonesty in medical research
2005/09/15 Free statistics software
2005/09/15 Testing for bimodality
2005/09/13 Self experimentation
2005/09/12 Science mentoring
2005/09/09 From my associations with doctors in controlled trials …
2005/09/09 Two articles debating equipoise
2005/09/08 Naming conventions for genes, proteins, etc.
2005/09/06 Finding more information about a gene
2005/09/01 Quality control exercises
2005/08/17 What's New in SPSS version 14.0
2005/08/16 Another disaster averted
2005/08/15 Contacting and working with me
2005/08/12 IRBs and scientific validity
2005/08/12 Sample size for a binary endpoint
2005/08/11 Case cohort design
2005/08/10 Dates in Excel and R
2005/08/03 Converting an odds ratio to a relative risk
2005/08/02 Publication in the ChanceWiki
2005/08/01 Information content of a continuous distribution
2005/07/29 Expected value and moments
2005/07/29 Overview of evidence-based-medicine
2005/07/28 More on normalization
2005/07/28 Moving R objects
2005/07/27 Permutation tests for microarrays
2005/07/26 Analysis of Gene Expression Data Short Course
2005/07/26 Merging in R
2005/07/22 Registration of clinical trials
2005/07/21 More on regular expressions
2005/07/19 Counterpoint on Google Scholar
2005/07/19 Very low values from Cronbach's Alpha
2005/07/15 The difference between absolute risks and relative risks
2005/07/11 Confidence interval for a correlation coefficient
2005/06/27 Dumping data from R to a text file
2005/06/20 What does a 60% drop mean?
2005/06/16 Step-down procedures for multiple comparisons
2005/06/10 More on the retroactive prayer study
2005/06/10 Some articles on meta-analysis
2005/06/06 When can I stop my CQI study?
2005/06/04 Taking charges of conflicting interest too far
2005/06/01 Information theory and microarrays
2005/05/31 The paired availability design
2005/05/26 Application of the ROC curve to microarray data
2005/05/25 Changes to STAT-L/sci.stat.consult
2005/05/25 Dimension reduction in a microarray experiment
2005/05/24 Importing value labels from Access into SPSS
2005/05/24 When one group only has a single observation
2005/05/23 Another open site closes
2005/05/20 Adjusting for covariate imbalance
2005/05/19 Computing normal probabilities
2005/05/17 What is critical thinking?
2005/05/16 A disaster averted
2005/05/16 Geometric distribution
2005/05/16 You have to make a distinction between the science and the technological applications …
2005/05/13 Hedge’s G
2005/05/13 Post hoc power is never justified
2005/05/11 Confidence intervals around a safety level
2005/05/10 String manipulations in R
2005/05/06 Preserving spacing in html code
2005/05/03 Searching the literature
2005/05/02 Meta-analysis talk
2005/04/28 PubMed tags
2005/04/27 Determining the optimal threshold for a diagnostic test
2005/04/26 Searching the Internet
2005/04/25 MedStats discussion group
2005/04/22 Microarray data analysis, again
2005/04/22 More than 90% censored values
2005/04/20 The test of a first rate intelligence …
2005/04/19 Incidence density ratio
2005/04/19 Measuring agreement
2005/04/19 S-plus version 7
2005/04/18 Profile analysis and MANOVA
2005/04/15 Fair Use of copyrighted material
2005/04/15 Presenting Numbers, Tables, and Charts
2005/04/15 Tolerance limits
2005/04/05 Do I have enough data after 24 months of time?
2005/04/05 Summing ordinal data
2005/03/31 Where is the confidence interval?
2005/03/25 Non-random samples
2005/03/25 Open-ended questions on a survey
2005/03/24 Inferential and descriptive statistics
2005/03/24 More on information theory models
2005/03/23 Surrogate outcomes
2005/03/22 A collection of randomized and non-randomized studies
2005/03/22 Coming soon!
2005/03/22 Language resources
2005/03/22 Meta-analysis for a diagnostic test
2005/03/22 Stratified Cox regression models
2005/03/22 Using Mathematica and Matlab for Statistics
2005/03/18 Meta-analysis
2005/03/15 Digitizing a graph
2005/03/14 Publicon software
2005/03/14 Quality of published research
2005/03/14 Selective reporting of research findings
2005/03/11 Clinical importance
2005/03/11 Cumulative meta-analysis
2005/03/10 Analysis of subgroup results …
2005/03/10 It seems to me reasonable to look for benefit or harm …
2005/03/10 More articles on microarrays
2005/03/10 Quotes for the month of March
2005/03/08 Sample size calculation for a nonparametric test
2005/03/08 Technology to end spam
2005/03/07 Review articles on microarrays
2005/03/02 PowerPoint Counterpoint
2005/03/01 Growth curves
2005/03/01 The costs of a false positive test
2005/02/28 Adjusting for a baseline measurement
2005/02/28 More on the top ten studies in EBM
2005/02/22 Taguchi methods
2005/02/21 Quotes for February
2005/02/21 Sackettisation, the artificial linkage …
2005/02/21 Scientific papers serve the needs of their authors …
2005/02/18 Developing good practice guidelines
2005/02/16 Report cards
2005/02/15 Moderator variables
2005/02/15 Public access to publications from NIH-funded research
2005/02/15 Side effects of Cox-2 inhibitors
2005/02/14 Optimization using the MM algorithm
2005/02/14 Relationship between sample size and p-values
2005/02/11 Control charts for monitoring mortality rates
2005/02/09 Continuous variables in a logistic regression model
2005/02/08 A small p-value does not mean a large difference
2005/02/03 Sampling the entire population
2005/02/01 A surprising application of the harmonic mean
2005/01/26 Placing consecutive dates in a column of an SPSS file
2005/01/25 Re-weighting the data
2005/01/24 A mathematician is …
2005/01/24 No human investigation can be called real science …
2005/01/24 Quotes for the month of January
2005/01/24 Steps in a typical Bayesian model
2005/01/24 Twas the night before surgery...
2005/01/24 What do you call the removal of …
2005/01/21 How good is your intuition?
2005/01/21 Summary Receiver Operating Characteristic Curve
2005/01/20 Adjusted odds ratios
2005/01/19 Testing baseline imbalance in a randomized study
2005/01/19 The Digital Object Identifier
2005/01/18 Confusion about p-values
2005/01/17 More thoughts on equipoise
2005/01/13 Small relative risks
2005/01/12 Forest plots
2005/01/06 Odds ratios less than one
2005/01/06 Two cautionary tales about data mining
2005/01/04 Spectrum Bias
2005/01/03 Monetary incentives
2005/01/01 A controversial meta-analysis
2005/01/01 Best EBM methods or teaching papers in 2004
2005/01/01 Ethical principles for Complementary and Alternative Medicine
2005/01/01 Examples of confidence intervals
2005/01/01 Media interview tips
2005/01/01 More on conflicts of interest
2005/01/01 More on discovering gene information
2005/01/01 Publicly available microarray data
2005/01/01 Statistical Analysis of Microarrays by Insightful Software
2005/01/01 The ethics of randomization
2005/01/01 Two articles in the Chance Wiki
2005/01/01 What alternative medicine can teach us about evidence-based medicine
2004/12/24 Acuity microarray analysis software
2004/12/24 Can you recommend a good book?
2004/12/24 Design and analysis of pilot studies
2004/12/24 Designing a questionnaire
2004/12/24 Is the randomized trial the gold standard for research?
2004/12/24 Outcomes research
2004/12/24 Subgroup Analysis
2004/12/22 Simpson's Paradox
2004/12/20 Hiring a statistician after the data has been collected …
2004/12/15 Neyman bias
2004/12/13 Prayer studies
2004/12/08 Surromed and the DecisionSite S-Plus Server Solution
2004/12/07 New in SPSS version 13.0
2004/12/01 Entrenched beliefs
2004/11/30 Sample size for cluster randomized trials
2004/11/29 Measuring heterogeneity in meta-analysis
2004/11/24 Alternatives to equipoise
2004/11/24 Intellectual conflict of interest [Incomplete]
2004/11/24 Unequal sample sizes
2004/11/19 Software patents
2004/11/12 Discrepancy between univariate and multivariate models
2004/11/09 Testing multinomial proportions
2004/11/05 Confidence intervals for complex research designs
2004/11/04 Research on therapies that have no known mechanism of action
2004/11/02 Anecdotal information
2004/11/01 Unblinding at the end of a study
2004/10/25 Automating statistical analyses
2004/10/25 Unnecessary diagnostic tests
2004/09/24 Top six mistakes in teaching EBM
2004/09/23 The price of Kaplan-Meier
2004/09/22 Multiple degree of freedom tests
2004/09/22 Sample size for an ordinal outcome
2004/09/21 A simple microarray experiment
2004/09/17 What's the best statistical model?
2004/09/15 Rates versus proportions
2004/09/13 Printer friendly versions of web pages
2004/09/10 International Classification of Functioning, Disability, and Health
2004/09/06 Full-Body Computed Tomography Screening
2004/09/03 Nitty Gritty NIH
2004/08/31 More on information theory models
2004/08/27 Report cards
2004/08/25 Statistical software
2004/08/24 Free Full Text on the Web
2004/08/24 Selection bias
2004/08/24 Stratified randomization
2004/08/05 Microsoft Excel Pivot Tables
2004/08/05 Unbalanced sample sizes for evaluating a diagnostic test
2004/08/04 So you want to volunteer for a research study?
2004/08/02 Secondary Uses of Data
2004/07/29 Breaking the blind
2004/07/29 Statalist
2004/07/27 Confidence intervals for proportions
2004/07/27 Evaluating the AUC for an ROC curve
2004/07/26 Random identification numbers
2004/07/23 Is there a mechanism?
2004/07/23 Sample size calculations in studies with a baseline
2004/07/21 Retrospective chart reviews and IRB approval
2004/07/20 Conflict of interest
2004/07/19 Aliasing patterns
2004/07/15 Adaptive randomization
2004/07/15 Bluejacket Toastmasters speech
2004/07/14 Randomization test
2004/07/09 Provisional means algorithm
2004/07/06 Planning a qualitative research study
2004/07/05 Sample size for a diagnostic test
2004/07/01 Early stopping
2004/07/01 Early stopping in an animal study
2004/06/30 Small relative risk
2004/06/28 Nonlinear Least Squares in S-plus and R
2004/06/25 Excluding placebo responders
2004/06/25 Publication bias
2004/06/24 Pap smears for women without a cervix
2004/06/23 The impact of XML on Statistics
2004/06/22 S+ArrayAnalyzer web seminar
2004/06/17 McNemar’s Test
2004/06/15 Data Mining with Clementine
2004/06/15 Evidence-based Complementary and Alternative Medicine
2004/06/14 Statistical consulting
2004/06/01 Categorical variables in a logistic regression model
2004/05/31 Health effects of smoking
2004/05/31 Monte Carlo methods
2004/05/24 Analyzing percentage data
2004/05/20 Sample size calculation example
2004/05/18 Goodness of fit test
2004/05/13 Correlations with categorical variables
2004/05/13 Sample size for a survival data model
2004/05/12 Advanced SPSS methods
2004/05/10 Information Theory
2004/05/06 Acuity microarray analysis software.
2004/05/03 Overlooking one's own flaws
2004/04/15 Degrees of freedom, Part 2
2004/04/15 The Wikipedia
2004/04/13 Focus groups and qualitative research
2004/04/12 Clinically trivial effects
2004/04/12 One tailed p-values
2004/04/12 One-tailed p-values
2004/04/09 A serious problem of publication bias
2004/04/07 Temporality of Causes
2004/03/23 Constraints on Randomization
2004/03/18 Evidence-based lessons learned from Cardiology
2004/03/18 Microarray data analysis
2004/03/15 EM Algorithm
2004/03/12 Steps for establishing a quality control program
2004/03/09 Central Limit Theorem
2004/03/09 Parametric versus nonparametric tests
2004/03/09 Quality control in the laboratory
2004/02/25 Conflict of Interest
2004/02/20 Evidence Based Medicine and Ethics
2004/02/18 Number needed to harm examples
2004/02/12 S-shaped curves
2004/02/05 Enumerative and Analytic Studies
2004/02/03 Educational Resources
2004/01/14 Brief Biography
2004/01/01 Craniosacral therapy
2004/01/01 Deaf chairs, lost cake recipes, and a letter from Maria.
2004/01/01 I hate PowerPoint
2004/01/01 In vitro fertilization prayer study
2004/01/01 In vitro fertilization prayer study
2004/01/01 My efforts to kill PowerPoint
2004/01/01 Recent updates
2004/01/01 Weblog entries from the 2004 JSM
2004/01/01 What’s a good value for Cronbach’s Alpha?
2003/11/27 Steps in a typical equivalence data analysis
2003/11/26 Data is/are
2003/10/01 A simple model of nonlinear growth
2003/09/22 Steps in a typical data mining model
2003/07/29 SPSS syntax for Poisson Regression, Marta Garcia-Granero, PhD
2003/07/24 What does “overfitting” mean?
2003/06/20 Steps in a typical ANOVA model
2003/06/05 Pitch the pie! Ban the bar!
2003/06/05 Skewed data
2003/05/09 Cluster randomization
2003/05/06 Maximum likelihood estimation
2003/04/30 For CMH employees only. Statistical Consulting Services
2003/04/23 Building a complex model
2003/02/03 Coding race/ethnicity
2003/01/01 Diagnostic …
2002/11/06 Displaying tables of percentages
2002/11/01 Post hoc power
2002/10/11 Log transformation
2002/10/11 Steps in a typical survival data analysis
2002/09/11 Checking the assumption of normality
2002/08/27 Data management for survival data
2002/08/27 Data management for survival data
2002/08/27 Data management for survival data
2002/08/01 Exploring interactions in a linear regression model
2002/07/26 Longitudinal data
2002/07/23 The concepts behind the logistic regression model
2002/07/22 SPSS dialog boxes for logistic regression
2002/07/12 So you want to write a questionnaire
2002/06/24 Interpreting coefficients in a linear regression model
2002/06/21 SPSS dialog boxes for a descriptive analysis
2002/06/21 SPSS dialog boxes for linear regression models
2002/05/06 Why 95% confidence limits?
2002/03/06 SPSS citation
2002/01/16 Biography
2002/01/01 Establishing validity and reliability
2002/01/01 Getting IRB approval for your research
2002/01/01 Stopping a study early
2001/11/02 Unequal group sizes
2001/10/11 BMJ letter
2001/10/11 Problems with a very small sample
2001/10/11 Steps in a descriptive model
2001/07/30 Parametric versus nonparametric tests
2001/07/30 Web polls
2001/01/24 Loading ODBC drivers from the Microsoft Data Access Pack
2001/01/19 The minimal impact of population size on power and precision
2001/01/09 Odds ratio versus relative risk
2001/01/01 Confidence interval with zero events
2001/01/01 Documenting negative results in a research paper
2001/01/01 Ethics of a placebo group
2001/01/01 Privacy concerns in research
2001/01/01 Quick sample size calculations
2001/01/01 Steps in a descriptive model
2001/01/01 Three things you need for a power calculation
2000/12/22 Protocol changes.
2000/09/28 Sample size for the Mann-Whitney U test
2000/08/24 Software used to create these web pages.
2000/08/23 Binary outcome sample size calculations
2000/08/23 Fisher’s Exact Test
2000/08/23 Stratified random sample.
2000/08/22 Alternating treatments
2000/06/27 Kaplan Meier
2000/02/02 Links from other sites
2000/01/28 Acknowledgements
2000/01/28 Exporting SPSS graphs and tables.
2000/01/28 Important disclaimer.
2000/01/28 Outliers
2000/01/28 Quota stratified random sampling.
2000/01/28 Spreadsheet or Database?
2000/01/27
2000/01/27 Bootstrap
2000/01/27 Composite scores
2000/01/27 Flaws in a research paper
2000/01/27 Intention to treat
2000/01/27 Jargon in Statistics
2000/01/27 Mixture models
2000/01/27 Number Needed to Treat
2000/01/27 Physician Performance Data
2000/01/27 Regression to the mean
2000/01/27 Sigma in the control chart.
2000/01/27 Splines
2000/01/27 Stein’s paradox
2000/01/27 What is collinearity?
2000/01/26 Best fitting curve
2000/01/26 Sample size for a confidence interval
2000/01/01 Copyright
2000/01/01 Future work on this website
2000/01/01 Information about myself
2000/01/01 Mean or median?
2000/01/01 My resume
2000/01/01 Obsolete webpages
1999/12/15 Circular data models
1999/11/15 Meta-analysis for a diagnostic
1999/11/15 Meta-analysis for a diagnostic
1999/10/15 Longitudinal data analysis
1999/09/27 Guidelines for logistic regression models
1999/09/23 Injury index creation
1999/09/21 Poisson regression model
1999/09/21 Steps in a typical linear regression analysis
1999/09/20 Importing spreadsheet data into SPSS
1999/09/20 Where do research ideas come from? by Ronan Conroy
1999/09/18 Documenting your SPSS data sets
1999/09/18 Inputting a two-by-two table into SPSS
1999/09/18 Modifying SPSS data
1999/09/13 Interim analysis
1999/09/13 Type II error
1999/09/13 Writing a research grant
1999/09/03 Asymmetric confidence intervals
1999/09/03 Bonferroni correction
1999/09/03 Chi-squared test
1999/09/03 Degrees of Freedom
1999/09/03 E notation
1999/09/03 General guide to data entry
1999/09/03 Page's test
1999/09/03 Pilot study
1999/09/03 Sample size for a diagnostic study
1999/08/19 ROC curve
1999/08/18 All or nothing
1999/08/18 Date calculations in SPSS
1999/08/18 Developing a research hypothesis
1999/08/18 How to randomize
1999/08/18 Importing database files into SPSS
1999/08/18 R-squared
1999/08/18 Raynald’s SPSS Tools
1999/04/18 T-test
1999/04/18 T-test
1999/01/15 Merging files in SPSS
1999/01/01 (Being updated)
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1999/01/01 Abstract submitted to Missouri …
1999/01/01 Abstracts for a possible upcoming …
1999/01/01 Ambiguity in the definition of the exponential distribution
1999/01/01 An example of a bad survey
1999/01/01 An interesting alternative to power …
1999/01/01 Another counter-intuitive …
1999/01/01 Are certain CAM therapies …
1999/01/01 Array bibliography (Being updated)
1999/01/01 BUGS is more than just one program
1999/01/01 Calculating weights to correct…
1999/01/01 Can sex be an outcome variable?
1999/01/01 Can you compute a confidence interval for
1999/01/01 Classic references in Statistics
1999/01/01 Competing books to the book I …
1999/01/01 Consulting remotely versus …
1999/01/01 Creating LaTex formulas on the fly
1999/01/01 Dealing with a large text file that …
1999/01/01 Exponential interpolation
1999/01/01 Facebook account
1999/01/01 Fan page for The Monthly Mean
1999/01/01 Fighting the claim that any size…
1999/01/01 Finding duplicate records in a 19 …
1999/01/01 Glossary for my second book
1999/01/01 How do I handle criticism
1999/01/01 How I got started in my career as an …
1999/01/01 How to avoid charges of plagiarism
1999/01/01 Humility is a good thing for …
1999/01/01 If you knew that failure was not an …
1999/01/01 Interpreting p-values in a …
1999/01/01 Is Evidence-Based Medicine too rigid?
1999/01/01 Is intuition real?
1999/01/01 Is it ethical to recruit a panhandler …
1999/01/01 Is there something better than …
1999/01/01 Jumpstart Statistics, a proposal for my …
1999/01/01 Lessons learned the hard way. Don’t throw …
1999/01/01 Location of my UMKC office
1999/01/01 Masters or Phd in Statistics?
1999/01/01 Meta-analysis for a single mean
1999/01/01 Minimum sample size needed for a time …
1999/01/01 More discussion on …
1999/01/01 My new twitter account
1999/01/01 Oh those pesky interactions!
1999/01/01 Ordinal entropy
1999/01/01 Ordinal surprisals
1999/01/01 Poem to help you remember the quotient rule
1999/01/01 Pooling different measures of risk in a …
1999/01/01 Poster presentation at the …
1999/01/01 Power calculations for comparison of …
1999/01/01 Proposed poster for the Missouri …
1999/01/01 Putting variable names into a model
1999/01/01 Quiz about p-values
1999/01/01 Resources using Stack Overflow
1999/01/01 SPSS or Stata?
1999/01/01 Standard operating procedures for a …
1999/01/01 Tentative table of contents for my second
1999/01/01 The futility of small sample sizes for …
1999/01/01 The odds ratio in logistic regression
1999/01/01 The Science-Based Medicine …
1999/01/01 The SPSS t-test is confusing
1999/01/01 Transforming the parameter …
1999/01/01 Using information theory to identify …
1999/01/01 What are the characteristics of a good consultant?
1999/01/01 What I use for talks instead of …
1999/01/01 What is a Generalized Estimating Equations …
1999/01/01 What is principal components analysis?
1999/01/01 What is residual confounding?
1999/01/01 What is the premier conference for …
1999/01/01 What makes a good website?
1999/01/01 What should clients get from you at …
1999/01/01 What to say when any data …
1999/01/01 What’s a fair price for SPSS?
1999/01/01 Where can I find free online textbooks?
1999/01/01 Why the least squares regression line …
1999/01/01 Withdrawing from a study and taking …
1999/01/01 Would you hire someone who knew theory …
0001/01/01 Criticisms of the IHME COVID-19 model
0001/01/01 How I use R Markdown to write research papers