Blog post

2023/12/31 Pages written in 2023
2023/09/12 Too many colors spoil the graph
2023/09/06 Information for a new research grant
2023/09/02 Using a linear Taylor series approximation to estimate rounding error
2023/08/30 Displaying SPSS syntax commands
2023/08/19 A few details about myself
2023/07/22 Reshaping longitudinal data in SAS
2023/07/12 Swarm plot examples
2023/07/06 Another pitch for my graphic novel project
2023/05/30 Version control basics, creating a personal repository
2023/05/30 Version control basics, updating a local project using git
2023/05/28 Version control basics, installing a local version of git
2023/05/28 Version control basics, updating a local project using git
2023/05/24 Resources mentioned during SDSS
2023/05/19 NLM Grants for Scholarly Works in Biomedicine and Health
2023/04/04 Non-standard evaluation inside functions and loops
2023/03/24 A mixture of normal distributions
2023/03/21 The hedging hyperprior for the normal distribution: unknown mean, unknown precision
2023/03/14 The hedging hyperprior for the normal distribution: known mean, unknown precision
2023/03/04 The modified power prior
2023/02/28 A thank you from BMJ Open
2023/02/28 The hedging hyperprior for the exponential distribution
2023/02/28 The hedging hyperprior for the normal distribution: unknown mean, known precision
2023/02/27 Using work resources on outside consulting
2023/02/21 Early pages on micro-arrays
2023/02/17 A critique of data sharing practices
2022/12/31 Pages written in 2022
2022/06/01 Testing d3
2022/05/24 My writing goals for Summer 2022
2022/02/26 Confusion about observational designs
2022/01/02 Progress on my website through the end of 2021
2021/12/31 Pages written in 2021
2021/12/11 Overfitting example using hurricane frequencies
2021/12/01 Dataset recommendations from statlib
2021/12/01 Dataset recommendations from the Journal of Statistics Education
2021/11/27 Joke about the dangers of extrapolation
2021/11/19 An overview of the National Health and Nutrition Examination Survey
2021/11/16 How many pages do I have in my website?
2021/10/30 Test diagrams
2021/10/28 The dark side of big data
2021/10/18 Diagnostics for a generalized linear model
2021/10/09 First steps with blogdown
2021/09/28 UMKC Faculty Researcher Award
2021/09/20 Deviance in a generalized linear model
2021/09/20 Direct standardization of mortality rates
2021/09/20 Quasi-likelihood models
2021/09/20 Zero-inflated models
2021/08/30 Working with negative binomial regression
2021/08/30 Working with Poisson regression
2021/08/30 Working with the Poisson distribution
2021/08/01 Learning more about SAS
2021/06/12 Basic Python Resources
2021/06/10 Anonymizing ids
2021/05/07 Downweighting informative prior distributions
2021/01/26 An Undergraduate Bayesian Statistics Course
2021/01/26 Help for teaching statistical computing skills
2021/01/23 How to run SAS inside an RMarkdown file
2021/01/23 How to save RMarkdown output in the results folder
2021/01/06 I have too many github repositories
2020/12/31 Pages written in 2020
2020/12/12 How can you learn R?
2020/11/21 How I use R Markdown to write research papers
2020/11/20 Advice for a beginner Bayesian
2020/10/12 Basic notation for survival or time-to-event analyses
2020/10/01 How I got started in Evidence-Based Medicine
2020/09/01 Research interests
2020/08/09 Biography for a research grant
2020/06/11 How to Call B.S. on Big Data.
2020/05/12 The Bioconductor library of packages for R
2020/04/30 Reading text files
2020/04/27 An incomplete list of data repositories
2020/04/23 Criticisms of the IHME COVID-19 model
2020/04/15 Codes for COVID-19 in the electronic health record
2020/03/15 Different map projections
2020/03/11 An example of a poor color choice
2020/03/11 An example of a poor color choice
2020/03/10 UMKC big data and data science initiatives
2020/03/02 Smart quotes, em dashes, and en dashes
2020/02/27 Proposed talk on secondary data analysis
2020/02/04 Data collection in a research methods class
2020/02/04 Data visualizaiton as art
2020/01/29 Printing R Markdown output to png files
2020/01/26 Artist wanted, here are the details
2020/01/23 Celebrating the failures of medical research using a graphic novel format
2020/01/17 Imbalanced sample sizes in the Fisher Exact test
2020/01/07 Identifying and manipulating non-breaking spaces
2019/12/31 Pages written in 2019
2019/05/15 Finding me on the Internet
2019/05/02 Several Python resources
2019/04/25 Writing the methods section of a research paper
2019/04/01 Ethical Practice in Data Mining
2019/03/29 Writing the introduction section of a research thesis or dissertation
2019/03/03 Slapping the word pilot on a failed study
2019/02/15 Make a loud mistake
2019/02/12 Another short biography
2019/02/11 Finding those weird characters
2019/01/23 Think positively - what has research done for us
2019/01/20 (Being updated)
2019/01/15 Citing one of my web pages
2019/01/14 Hints for designing effective questionnaires
2018/12/31 Pages written in 2018
2018/11/11 Getting R to shut the heck up
2018/10/30 Fighting SASism
2018/09/21 What to do about claims of borderline statistical significance
2018/09/19 What I did in the last twelve months
2018/09/10 Super Pi, a group to teach cluster computing using the Raspberry Pi
2018/09/04 Python bindings for MPI
2018/09/04 Python, Raspberry Pi, and cluster computing
2018/08/27 What day is it in my R program?
2018/08/17 Business essentials for starting an independent consulting practice
2018/08/13 The Dark Side of Data Science
2018/07/24 A simple structure for documentation
2018/07/20 Grading rubric for computer assignments
2018/07/10 How to be more effective in your professional life
2018/07/07 How much missingness can you tolerate?
2018/07/03 Section 508 CoP: PDF Accessibility – Part One
2018/06/24 What goes into a contract for a consultation
2018/06/09 Big data groups at UMKC and UM/Columbia
2018/05/17 What are we doing to justify all that time we’re budgeting?
2018/05/13 Some interesting quality improvement resources
2018/05/10 Draft policy on statistical support for research
2018/05/01 Learning more about SAS
2018/04/11 Definitions of Criteria and Considerations for Research Project Grant Critiques
2018/04/03 Guidelines for estimating biostatistician effort and resources on grants
2018/04/03 Statistical and Machine Learning forecasting methods: Concerns and ways forward
2018/04/02 Developing an interdisciplinary research program
2018/04/02 My research interests
2018/04/02 My research interests, one page limit
2018/04/02 My teaching approach
2018/04/02 My teaching interests, one page limit
2018/04/02 Pmean: My teaching and research statement
2018/04/01 To combat physician burnout and improve care, fix the electronic health record
2018/03/29 Starting a heron-i2b2-analytics repository
2018/03/28 And the least important variable is
2018/03/28 Recommended format for homework assignments
2018/03/28 Using the transpose procedure in SAS
2018/03/27 Next stop - BMC Medical Informatics and Decision Making
2018/03/25 Two articles published in the Encyclopedia of Big Data
2018/03/23 Exporting a graph in SAS
2018/03/23 Tests of equivalence and non-inferiority
2018/03/23 They want a short biography from me
2018/03/22 Mining the electronic health record, why and how
2018/03/22 Peer grading in Introduction to R - SPSS - SAS
2018/03/21 Changes to the Introduction to R - SAS - and SPSS classes
2017/12/31 Pages written in 2017
2017/12/15 No more rainbows
2017/11/08 Writing about numbers
2017/04/07 Obnoxious use of red text in RStudio
2017/03/23 Medicare Claims Synthetic Public Use Files (SynPUFs)
2017/02/23 Text Mining with R
2017/02/02 R and SQL Server 2016
2016/12/31 Pages written in 2016
2016/09/23 By the skin of my teeth
2016/08/08 Changing the font size in R
2016/08/08 Changing the font size in RStudio
2016/08/03 The Importance of Reproducible Research in High-Throughput Biology
2016/04/18 Interpretation of Changes in Health-related Quality of Life: The Remarkable Universality of Half a Standard Deviation
2016/04/10 Some open source Kaplan Meier curves
2016/03/08 PLOS ONE 2015 Reviewer Thank You
2016/02/05 Calculating power for a test of association in a two by two table
2016/02/05 Simulating power for a test of association in a two by two table
2016/01/13 My book chapter on R
2015/12/31 Pages written in 2015
2015/12/02 A book review of my first book
2015/12/02 Safeguarding Patients in Clinical Trials with High Mortality Rates
2015/11/16 My Google Scholar profile
2015/10/13 How many research subjects
2015/06/30 This is Statistics promotional toolkit
2015/06/03 My research contributions to Evidence Based Medicine
2015/06/03 My research contributions to patient accrual models
2015/05/30 My research contributions to numerical accuracy
2015/05/30 My research contributions to reproductive toxicology
2015/05/27 I am now a number in the ORCID database
2015/05/26 Developing Grant Proposals: Guidelines for Statisticians Collaborating Under Limited Resources
2015/04/16 Restoring invisible and abandoned trials
2015/04/12 Equations using MathType
2015/04/03 Examining relationships in R
2015/01/15 The answer is 17 years, what is the question. Understanding time lags in translational research
2014/12/31 Pages written in 2014
2014/12/23 Report on Survey Participation Refusals
2014/11/01 Cox regression in R
2014/11/01 More Kaplan-Meier curves in R
2014/10/31 Kaplan-Meier curves in R
2014/08/13 Sample size of 12 per group rule of thumb for a pilot study
2014/07/24 What is the probability of a probability of one
2014/07/22 An example of a simple sample size justification
2014/05/31 What should go into a data codebook
2014/05/03 Using BUGS within the R programming environment
2014/05/01 Not all scientific studies are created equal
2014/04/14 Using statistical design principles to plan a Monte Carlo analysis – part 2
2014/04/06 Predicting clinical trial results based on announcements of interim analyses
2014/03/12 Estimating the efficiency of a completely randomized block design
2014/03/05 foreach: Foreach looping construct for R
2014/02/24 NIH is interested in big data
2014/02/20 Why Coincidences, Miracles And Rare Events Happen Every Day.
2014/01/29 Will 2015 be the Beginning of the End for SAS and SPSS?
2014/01/15 Resources for a workshop in R
2013/12/31 Pages written in 2013
2013/12/18 Sample size for comparing two diagnostic tests
2013/12/10 Claims lacking specificity are meaningless
2013/12/09 Is Possibility Theory better than Probability Theory?
2013/12/07 Simple example of Fourier transform
2013/12/04 The cost of a bad prediction
2013/12/01 Five Fridays in a month
2013/11/30 You can now register for an account on my blog.
2013/11/29 Two questions you should always ask at the end of a consulting session
2013/11/27 Blog is up and ready for testing
2013/11/02 Testing an R function
2013/09/26 Hedging your bets on an informative prior
2013/09/10 Can I focus on a subset of conditions in my experiment
2013/09/04 Running JAGS from R, a simple example
2013/09/03 Confusion about BUGS
2013/09/03 Developing a computer program using modern methods
2013/08/26 I get a letter published in the Kansas City Star
2013/08/14 Resource for statisticians called as legal experts in a trial
2013/08/07 Data sources for a proposed course on secondary data analysis
2013/08/01 Sample chapter: The first three steps in a descriptive data analysis
2013/07/31 Calculating predicted probabilities from a logistic regression model
2013/07/29 R code for estimating the duration of a clinical trial with a fixed sample size
2013/07/29 R code for estimating the sample size of a clinical trial with a fixed duration
2013/04/26 How do you compute an adjusted probability?
2013/04/23 The confidence interval for my odds ratio is too narrow!
2013/04/09 Deciphering a non-linear curve
2013/04/02 Counting squares
2013/03/25 A complex subgroup definition
2013/02/19 Placing the mind of a statistician into software
2013/01/14 What does it really mean to say that a mean of a large number of variables is approximately normal
2012/12/31 Elbow model for accrual
2012/12/31 Mixture of two binomial distributions
2012/12/31 Pages written in 2012
2012/12/31 What you should look for in a statistical consultant
2012/12/12 A single wildly large value makes you less confident that the mean of your data is large
2012/12/12 A single wildly large value makes you less confident that the mean of your data is large
2012/12/08 Animations in R
2012/12/04 Analyzing data from the National Hospital Ambulatory Care Survey
2012/11/21 Data sharing
2012/11/05 Lasso talk
2012/11/05 Lasso talk, figure 1
2012/11/05 Lasso talk, figure 2
2012/11/05 Lasso talk, figure 3
2012/11/05 Lasso talk, figure 4
2012/11/05 Lasso talk, figure 5
2012/11/05 Lasso talk, figure 6
2012/10/13 Accrual with a slow start-up
2012/10/10 Mapping my runs in R
2012/10/08 Are you qualified to make that comment?
2012/10/04 Don’t write your own questionnaire
2012/10/01 Debating the validity of snowball sampling
2012/09/19 Borderline p-values
2012/09/19 When should I use the Fisher’s Exact Test and when should I use the Chi-Square Test
2012/09/12 What’s the name of the test for comparing two proportions?
2012/08/27 Data management in R versus SAS
2012/07/27 Whiskers in a boxplot
2012/07/20 Parsing information in an XML file
2012/07/16 The secret to great wealth is …
2012/07/03 Counting pages at my old and new websites
2012/05/22 (Being updated)
2012/05/17 Reviewing how the binomial and negative binomial distributions work
2012/05/15 A simple example of change of variable
2012/05/12 A fishy story about randomization
2012/05/02 Statistical distributions borrowed from Wikipedia
2012/04/22 Accrual with refusals, exclusions, or dropouts
2012/04/22 Accrual with refusals, exclusions, or dropouts
2012/04/19 The simple accrual model, redefined
2012/04/18 BUGS model for the simple Poisson accrual model
2012/04/13 Fitting the homogenous accrual model in BUGS
2012/04/09 Bad scaling choices for the SPSS ROC curve
2012/04/09 Deriving accrual using the geometric distribution
2012/04/03 Iowa talk on accrual
2012/03/21 Those pesky tab characters
2012/03/19 Free consultation means no co-authorship?
2012/03/19 Free consultation means no co-authorship?
2012/03/07 Making predictions based on just the correlation
2012/03/07 Why use a Bayesian adaptive trial?
2012/02/23 How sample size calculations are reported in the literature
2012/02/18 What non-statistical skills do consultants need?
2012/02/08 Questions for a panel on statistical consulting
2012/02/06 Percentage of care that does not have a medical basis
2012/01/27 Promoting your consulting career in the era of web 2.0
2012/01/25 Honorable mention for my R code on accrual
2012/01/12 Arguing with the material in an ethics training program
2012/01/09 What to report when SPSS says the p-value is zero
2012/01/06 Is sample size justification really different for animal studies compared to human studies?
2012/01/04 Post hoc power persists because peer-reviewers demand it
2012/01/01 A very silly graph
2011/12/31 Author pays model
2011/12/31 Definition of translational research
2011/12/31 Pages written in 2011
2011/12/31 Review of new James Penston book
2011/12/31 Some thoughts on a backup policy
2011/12/31 Strange results in KMeans clustering
2011/12/20 Unrealistic scenarios for sample size calculations
2011/12/16 Discrepancies in the chisquare test
2011/12/08 Example abstracts for a training class
2011/11/22 Justifying the sample size in a qualitative research study
2011/11/21 Why is a 20% dropout rate bad?
2011/11/14 Possible webcast topics for a new client
2011/11/08 SPSS won’t compute my odds ratio!
2011/11/07 Looking at another grant opportunity
2011/11/03 A bunch of univariate nonparametric tests versus a single parametric model
2011/10/31 Meta-analysis with non-comparable procedures
2011/10/24 Lasagna’s Law on patient recruitment
2011/10/20 My entry into the Applications of R in Business Competition
2011/10/19 Net-accessible resources for group sequential designs
2011/10/17 How you can teach Bayesian methods in an introductory Statistics class and why you should
2011/10/11 Conditional Frailty Models
2011/10/06 Statistical literacy talk
2011/10/04 Proposal for session on grant writing
2011/09/16 What single idea will make the biggest impact on healthcare today
2011/09/13 Draft grant submission on patient accrual
2011/09/12 Sharing the same classroom for five consecutive years
2011/09/07 Should I report the univariate or the multivariate logistic regression analysis?
2011/09/06 Statistics is more than just cutting computer code
2011/09/02 Can I salvage my negative confidence interval
2011/09/02 I can’t get SAS to model the cluster effects in the MEPS data set
2011/09/01 What are the assumptions of logistic regression
2011/08/17 New flat rate for consulting
2011/08/16 Positive statements about no conflicts of interest
2011/08/13 Banning editorials and clinical reviews from authors with industry ties
2011/08/11 The advantages of IBM SPSS software
2011/08/04 Publicity for your consulting career
2011/08/04 What goes on your business card
2011/08/01 Using Social Media to promote your consulting career
2011/07/30 Twelve subjects in a within subject design
2011/07/27 Validation of OpenEpi software
2011/07/24 Second invitation to talk about how independent consulting is different
2011/07/21 There’s more than one way to calculate a Fisher’s exact p-value
2011/07/14 Establishing accuracy for a statistical program (created 2011-07-14).
2011/07/11 Teaching classes for a fee
2011/07/10 Calculating a confidence interval for a standard deviation
2011/06/21 Software that I use on my computers
2011/06/20 How much work does that second reviewer have to do in a meta-analysis
2011/06/17 Statistical calculators on the web
2011/06/16 Looking for help to test software for monitoring accrual in a clinical trial
2011/06/16 Small business grant? Maybe not (created 2011-06-16).
2011/06/15 How I became a skeptic
2011/06/14 Cartoon about placebos
2011/06/03 Which version of SPSS should you get
2011/06/02 New shortened structure for NIH grants
2011/06/02 When you’re stuck writing major sections of another person’s grant
2011/06/01 It’s been a quiet year
2011/05/31 Can prisons randomly assign prisoners without their consent?
2011/05/25 A simple segmented linear regression model, borrowed from the BUGS manual
2011/05/22 Bayesian inference on the geometric distribution
2011/05/21 Using a binary coding trick illustrated by a Car Talk puzzler
2011/05/20 A simple hierarchical model for the Poisson distribution, borrowed from the BUGS manual
2011/05/20 Promoting your consulting career in the era of Web 2.0
2011/05/16 What I’d look for in a new computer
2011/05/16 Yet another biography
2011/05/11 Is it ethical to provide statistical consulting on a disseration to a Ph.D. candidate
2011/05/09 How independent consulting is different
2011/05/05 The importance of being self-critical
2011/05/02 Why is my standard deviation so small
2011/04/26 I can’t find a standard deviation for my power calculations
2011/04/22 Examples of the difference made by high quality research
2011/04/20 Can Bayesian methods help with small sample sizes?
2011/04/13 Resources for Comparative Effectiveness Research
2011/04/11 Thinking about the title for my second book
2011/04/07 Quotes and references from Dr. Harrell
2011/03/24 Does a wide confidence interval mean that my conclusions are all wrong?
2011/03/08 Macros in Stata
2011/03/08 The nature of advice on email discussion lists
2011/02/22 My special Zotero style
2011/02/17 I won’t serve on my IRB, but there is a way I can still help.
2011/01/01 Good news about my second book proposal
2010/12/31 Pages written in 2010
2010/12/20 Creating LaTex formulas on the fly
2010/12/09 Location of my UMKC office
2010/12/01 Are certain CAM therapies undeserving of further study
2010/12/01 Closed form solution for homogenous accrual
2010/12/01 Using the Poisson distribution for modeling accrual
2010/11/26 Poem to help you remember the quotient rule
2010/11/25 Transforming the parameter also transforms the prior distribution
2010/11/22 The odds ratio in logistic regression is the opposite of what it should be
2010/11/19 BUGS is more than just one program
2010/11/16 Ambiguity in the definition of the exponential distribution
2010/11/09 The Science-Based Medicine blog defends itself
2010/11/06 Taking conflict of interest too far
2010/11/03 Would you hire someone who knew theory
2010/11/02 Justifying the sample size in an equivalence study
2010/10/23 Work in pharma versus work in academia
2010/10/16 Lost page
2010/10/12 Lost page
2010/10/04 Poster presentation at the Missouri Technology conference
2010/10/01 If you knew that failure was not an option what would you do
2010/10/01 Why the least squares regression line has to pass through XBAR, YBAR
2010/09/20 Is there something better than Evidence Based Medicine out there
2010/09/20 Putting variable names into a model automatically
2010/09/16 Oh those pesky interactions!
2010/09/15 My new twitter account
2010/09/10 Can you compute a confidence interval for your p-value
2010/09/02 Using information theory to identify discrepancies within and between text files
2010/09/01 Is it ethical to recruit a panhandler
2010/08/31 News and announcements
2010/08/25 Learning how to fit latent growth curve in Amos
2010/08/19 Is Evidence-Based Medicine too rigid
2010/08/19 What is a Generalized Estimating Equations Model
2010/08/19 What is principal components analysis?
2010/08/16 Competing books to the book I am planning to write
2010/08/14 What should clients get from you at the end of your first consulting session
2010/08/11 Glossary for my second book
2010/08/06 What’s a fair price for SPSS?
2010/08/05 Fighting the claim that any size difference is clinically important
2010/07/30 Standard operating procedures for a statistical consulting center
2010/07/26 Acknowledgments for my second book
2010/07/26 Pooling different measures of risk in a meta-analysis
2010/07/26 When should research in a given area end?
2010/07/24 Sample chapter: The first three steps in selecting an appropriate sample size
2010/07/24 Tentative table of contents for my second book
2010/07/23 Jumpstart Statistics, a proposal for my second book
2010/07/21 Salary survey for Biostatisticians
2010/07/04 Another counter-intuitive probability problem
2010/07/01 Can political questions be resolved by science
2010/06/30 Resources using Stack Overflow
2010/06/29 Classic references in Statistics
2010/06/29 The SPSS t-test is confusing
2010/06/28 Fitting a new class of nonlinear regression models
2010/06/28 What I use for talks instead of Powerpoint
2010/06/28 What I use for talks instead of Powerpoint
2010/06/16 The futility of small sample sizes for evaluating a binary outcome
2010/06/11 An example of a bad survey
2010/06/09 An interesting alternative to power calculattions
2010/06/08 Minimum sample size needed for a time series prediction
2010/06/03 Computing power for an interaction in linear regression
2010/05/28 Lessons learned the hard way. Don’t presume to know how your software handles missing value codes
2010/05/28 What is the premier conference for statistical consulting
2010/05/26 Making simple modifications to a graph in SPSS
2010/05/24 How I got started in my career as an independent statistical consultant
2010/05/21 How do I handle criticism
2010/05/15 How to avoid charges of plagiarism
2010/05/15 Withdrawing from a study and taking your data with you
2010/05/14 Lessons learned the hard way: don’t throw good money after bad
2010/05/03 More discussion on instrumental variables
2010/05/03 What is a good surrogate measure for socioeconomic status
2010/04/14 Interpreting p-values in a published abstract, part 1
2010/04/14 Quiz about p-values
2010/04/11 Using entropy and the surprisal value to measure the degree of agreement with the consensus finding
2010/04/07 What makes a good website?
2010/04/05 Should I learn R instead of SAS
2010/04/02 Dealing with a large text file that crashes your computer
2010/03/25 What to say when any data analysis is pointless
2010/03/22 Calculating weights to correct for over and under sampling
2010/03/20 Ordinal surprisals
2010/03/16 Can sex be an outcome variable?
2010/03/11 Ordinal entropy
2010/03/02 Finding duplicate records in a 19 million record database
2010/02/25 Is intuition real?
2010/02/13 Abstract submitted to Missouri Regional Life Sciences Summit
2010/02/11 Exponential interpolation
2010/02/11 Fan page for The Monthly Mean
2010/02/11 Meta-analysis for a single mean estimate
2010/02/10 Statistical Literacy for Medical Librarians
2010/02/10 Survey of librarians in the Midcontinental Chapter of the Medical Library Association
2010/02/08 Consulting remotely versus consulting in person
2010/02/08 Humility is a good thing for researchers to have
2010/02/07 What are the characteristics of a good consultant
2010/02/03 Proposed poster for the Missouri Regional Life Sciences Summit
2010/01/27 Finding the standard deviation for a power calculation
2010/01/25 Facebook account
2010/01/20 Abstracts for a possible upcoming talk
2010/01/19 Masters or Phd in Statistics?
2010/01/19 SPSS or Stata?
2010/01/17 Where can I find free online textbooks
2010/01/15 The first three steps in selecting an appropriate sample size
2010/01/14 Lost page
2010/01/11 Power calculations for comparison of Poisson counts across two groups
2010/01/06 What is residual confounding?
2010/01/01 My life so far, fails to meet expectations
2009/12/31 Pages written in 2009
2009/12/14 Entering and analyzing data from a two by two table
2009/11/30 Randomly generating simple math problems using R
2009/11/23 Generating multinomial random variables in Excel
2009/11/07 Jump start statistics for beginning researchers
2009/11/02 Rotating locations
2009/10/30 Sneaking ineligible patients into a clinical trial
2009/10/29 What is a normal probability plot?
2009/10/16 Data layout for an ROC curve
2009/10/13 Accounting for clusters in an individually randomized clinical trial
2009/10/13 Are we statisticians gods?
2009/10/13 Use of Likert data with ANOVA
2009/09/16 Can I stop this study?
2009/09/16 The problem with being too sensitive
2009/09/15 Simple longitudinal data analyses, part 1
2009/09/14 Getting a good cut-off
2009/09/14 Power for a three arm experiment
2009/09/12 Tentative training schedule
2009/09/12 The controversy over standardized beta coefficients
2009/08/12 Standard error for an odds ratio
2009/07/24 Formula for multiple imputation
2009/07/08 Do multiple time points require a Bonferroni adjustment
2009/06/30 The perils of self-evaluation
2009/05/24 Institute of Medicine report on conflict of interest
2009/05/22 Data that IRBs should collect about themselves
2009/05/22 The surprisal matrix and applications to exploration of very large discrete data sets
2009/05/11 NYTimes advice on increasing website traffic
2009/04/28 Is this a case-control design?
2009/04/20 Calculating NNT for
2009/04/20 Can I use you as a teaching example?
2009/04/15 Calculating NNT for infection rates
2009/03/30 Two business contacts
2009/03/19 I love to write
2009/03/12 Five points or seven points on a survey scale
2009/03/07 Good papers for a journal club
2009/03/05 Locating individual points on an ROC curve
2009/02/26 Sample size calculation for a logistic regression model
2009/02/18 Fewer than 10 events per variable
2009/02/16 Acknowledging the
2009/02/16 Interpreting a negative autocorrelation
2009/01/28 Calibrating information
2009/01/21 Updates for 2009
2009/01/19 Changes in the adjusted hazard
2009/01/14 Drawing simple mathematical graphs
2009/01/07 A simple example of joint and conditional entropy
2009/01/06 Maybe Powerpoint isn’t so bad
2009/01/01 A sportswriter tackles the Monty Hall problem
2009/01/01 Analyzing bad data
2009/01/01 Developing a website logo
2009/01/01 DNA binding image
2009/01/01 New Bioinformatics degree
2009/01/01 What is the effect of an unmeasured covariate?
2008/12/31 Pages written in 2008
2008/12/17 Viewing SPSS and SAS output without buying SPSS and SAS
2008/12/16 Using a sub-optimal approach in meta-analysis
2008/11/21 What is the Lan-DeMets approach to interim analysis
2008/11/17 Updates for 2008
2008/11/05 Explaining CART models in simple terms
2008/11/05 Reading abstracts instead of the full paper
2008/11/04 Statisticians are not gatekeepers
2008/11/01 Comparing a set of microarray experiments to a model experiment
2008/10/28 Refusing to analyze a data set
2008/10/28 To be updated
2008/10/22 A standard deviation that is too big for its own britches
2008/10/20 Computing a difference between first and last variables
2008/10/19 Errors in statistical methodology
2008/10/19 Example of power calculation for a repeated measures design
2008/10/18 Biostatistics or Health Informatics programs in or near Kansas City
2008/10/18 Defending Bonferroni
2008/10/18 Interpretations for a two by two table
2008/10/14 Normality assumptions for the paired t-test
2008/10/14 T-test with 3 treatment values and 2 controls
2008/10/11 Example of power calculation for a repeated measures design
2008/10/08 A simple example of overfitting
2008/10/07 How do I fit a piecewise linear regression
2008/10/07 What’s new in SPSS 17
2008/10/01 Evaluating private conflicts of interest
2008/09/25 Can I ask you a question
2008/09/25 Comparing pre and post data with a parallel control group
2008/09/25 Processing skip fields in SPSS
2008/09/23 Venn diagrams with proportional areas
2008/09/18 Can an outcome with three levels be used in logistic regression
2008/09/18 Links and references that I need to add
2008/09/17 Categorizing entropy values
2008/09/15 Jackknife applied to entropy calculations
2008/09/13 Use of entropy measures for sperm morphology classification
2008/09/12 Comparisons involving distinct groups collected at different times and with different methods
2008/09/12 How do you compute a continuity correction for a confidence interval
2008/09/12 What does “population-based” mean?
2008/09/09 Multiple email accounts
2008/09/09 Where did you get that formula for the confidence interval
2008/09/08 The case of Ranjit Kumar Chandra
2008/09/04 Applying the sequence logo concept to data quality
2008/08/28 Checks for data quality using metadata
2008/08/27 Controversies with a test for ovarian cancer
2008/08/25 Entropy as a measure of data quality across multiple variables
2008/08/20 Another inquiry about slash and burn models
2008/08/20 Is there a scientific basis for EBM?
2008/08/20 Source for sample size formula
2008/08/20 What resources are available for fellows
2008/08/20 Where to look for information in a controversial area
2008/08/19 Social networking as a business tool
2008/08/11 Cumulative entropy as a measure of data quality
2008/08/09 To be updated
2008/08/07 Interval scale for count data
2008/08/06 Harsh sanctions are only part of the solution
2008/08/05 Comparing two proportions out of the same multinomial population
2008/08/05 Reporting of adverse events
2008/08/02 Resources from the Statistical Consulting Section of the American Statistical Association
2008/07/30 Naming conventions for variables
2008/07/28 Business aspects of an independent statistical consultant
2008/07/28 What does the FDA think about Bayesian statistics
2008/07/24 Plug for accrual research
2008/07/24 Should I abandon FrontPage?
2008/07/23 Godwin’s Law
2008/07/23 Mail and calendar software I use in my new job
2008/07/23 My very first meta-analysis
2008/07/23 What distribution does this data come from
2008/07/21 Survey results from nine out of thirty six
2008/07/18 Can I use some material from your website
2008/07/18 Software for bootstrap and resampling
2008/07/18 Where can I learn more about Statistics?
2008/07/17 Getting on and off various email lists
2008/07/15 A misleading bar graph
2008/07/15 Hire me as a consultant
2008/07/15 Undeclared missing code leads
2008/07/15 Using Google to search through my website
2008/07/12 How to report a one-tailed Fisher’s Exact Test
2008/07/11 Pearson correlation and ordinal data
2008/07/11 Pearson correlation and ordinal data don’t mix
2008/07/09 Where did that standard deviation come from
2008/07/01 Distrust of a Bayesian
2008/06/24 How many files
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?
2008/05/26 A simple Bayesian model for
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
2008/04/25 Directions to my new office
2008/04/24 Nomination for the Kreamer Award for Research Excellence
2008/04/24 Upcoming topics in Poisson regression
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?
2008/03/25 Statistics for Boards
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 ROC curve for an imperfect gold standard
2008/03/12 ROC curve for an imperfect gold standard
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
2008/01/31 Does prevalence affect sensitivity
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
2008/01/05 High altitude effects on athletic performance
2008/01/04 What statistic should I use when?
2008/01/03 Type III error
2008/01/01 Cytel software has developed a Poisson
2008/01/01 I hate bad research examples
2008/01/01 New format for articles, books, and websites
2008/01/01 New personal pages
2008/01/01 Reliable diagnosis of cataracts
2008/01/01 Resources for Statistical Evidence in Medical Trials
2008/01/01 Reviews of “Statistical Evidence.”
2008/01/01 To be updated
2008/01/01 To be updated
2008/01/01 To be updated
2007/12/31 Pages written in 2007
2007/12/28 When should you use a log transformation?
2007/12/28 Who wrote the law that mandates PowerPoint?
2007/12/19 Analyzing data under an Intention to Treat model
2007/12/18 The post-modern assault on evidence-based medicine
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 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 Open-access (OA) journals and their impact on research and the practice of medicine (created October 18, 2007
2007/10/18 Revising my definition section
2007/10/14 Unused resources for my open access talk
2007/10/12 Illustrations for a case study of the TGN 1412 trial (created 2007-10-12).
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
2007/09/20 The order of entering interactions into a model
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 Extra information for the resume of Stephen D. Simon
2007/09/04 Resources for grant writers
2007/08/31 External scholars needed to review my promotion materials
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?
2007/07/28 Bibliography of papers relating to predicting accrual in clinical trials
2007/07/26 Conflict of interest in the Wakefield MMR study
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
2007/07/12 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
2007/06/27 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
2007/05/30 Using real examples in teaching statistics (May 30, 2007)
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
2007/04/10 IRB review of studies with methodological flaws
2007/04/10 Quantifying the ability of dreams to predict the future
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
2007/03/16 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
2007/03/09 Manipulation of peer-review publications by pharmaceutical companies
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
2007/02/27 Stats
2007/02/27 Stats
2007/02/27 Stats
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 Searching through the Current Index to Statistics
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
2007/01/16 Technometrics review of Statistical Evidence
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
2007/01/04 Can Google replace your doctor?
2007/01/03 Variable cluster sizes and their impact on sample size calculations
2006/12/31 Pages written in 2006
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
2006/08/02 To be updated
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 A Visit From a Thief
2006/04/17 Blindfolded Donkey
2006/04/17 Ninety Nine Samples
2006/04/17 Placing the symbol X-bar in a document
2006/04/17 The Busy Tailor
2006/04/17 The Only True Path
2006/04/17 Three new koans
2006/04/17 Topic list is complete!
2006/04/17 Useless Gifts
2006/04/17 Wax Fruit
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 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
2006/03/15 To be updated
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 To be updated
2006/03/08 What is construct validity?
2006/03/06 Best EBM articles in 2005
2006/02/28 Statistical koan #2
2006/02/28 To be updated
2006/02/28 Update on my book, Statistical Evidence in Medical Trials
2006/02/27 Statistical koans
2006/02/15 Difficulties in generalizing
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 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
2005/12/31 Pages written in 2005
2005/12/21 Vote for me
2005/12/19 Object oriented features of R
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
2005/10/15 Searching for information about the molasses with milk enema
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
2005/10/12 Discovering gene information using OMIM
2005/10/12 Lost page
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
2005/09/22 HIPAA and research
2005/09/19 An error slips through the peer review process
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 Two articles debating equipoise
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
2005/08/05 Reporting of adverse events
2005/08/03 Converting an odds ratio to a relative risk
2005/08/02 A third search for the evidence
2005/08/02 Allegations of scientific misconduct (August 1, 2005)
2005/08/02 An inefficient approach to randomization (August 10, 2005)
2005/08/02 Effective communication about randomized clinical trials (created 2005-02-22)
2005/08/02 More on the weaknesses of randomized trials (created 2005-02-14)
2005/08/02 Publication in the ChanceWiki
2005/08/02 S-PLUS Clinical Safety Miner (March 10, 2005, Model, Software)
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 Moving R objects
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
2005/06/20 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
2005/06/07 Another search for evidence
2005/06/07 Another top ten study in EBM (February 14, 2005)
2005/06/07 I abhor Lilliefor and other tests of normality (created 2005-04-14).
2005/06/07 Ten research studies that anyone teaching EBM should be familiar with (January 17, 2005)
2005/06/07 When the F test is significant, but Tukey is not (created 2005-09-09)
2005/06/06 When can I stop my CQI study?
2005/06/04 Taking charges of conflicting interest too far
2005/05/31 The paired availability design
2005/05/25 Changes to STAT-L/sci.stat.consult
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 More on searching the literature
2005/05/17 What is critical thinking?
2005/05/16 Geometric distribution
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 More than 90% censored values
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 Lost page
2005/03/08 Sample size calculation for a nonparametric test
2005/03/08 Technology to end spam
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
2005/02/18 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
2005/01/27 Statistical Evidence in Medical Trials
2005/01/26 Placing consecutive dates in a column of an SPSS file
2005/01/25 Re-weighting the data
2005/01/24 Steps in a typical Bayesian model
2005/01/24 Steps in a typical Bayesian model
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 Standard deviation versus standard error (May 16, 2005)
2005/01/01 Statistical Analysis of Microarrays by Insightful Software
2005/01/01 The ethics of randomization
2005/01/01 The S+ CorrelatedData Library (May 19, 2005)
2005/01/01 Two articles in the Chance Wiki
2005/01/01 What alternative medicine can teach us about evidence-based medicine
2004/12/31 Pages written in 2004
2004/12/29 Testing for side effects
2004/12/28 Weblinks for December 2004
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
2004/12/22 Simpson’s Paradox
2004/12/21 Subgroup analysis
2004/12/15 Neyman bias
2004/12/13 Prayer studies
2004/12/07 New in SPSS version 13.0
2004/12/01 Entrenched beliefs
2004/11/29 Confidence intervals
2004/11/29 Lost page
2004/11/29 Measuring heterogeneity in meta-analysis
2004/11/24 Alternatives to equipoise
2004/11/24 Controversy over stopping a study early
2004/11/24 Unequal sample sizes
2004/11/19 Software patents
2004/11/17 Ratio of observations to independent variables
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 Searching for bimodality
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
2004/07/15 Bluejacket Toastmasters speech
2004/07/14 Randomization test
2004/07/09 Provisional means algorithm
2004/07/08 Testing for side effects
2004/07/06 Planning a qualitative research study
2004/07/05 Sample size for a diagnostic test
2004/07/01 Early stopping in an animal study
2004/07/01 Lost page
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
2004/06/25 Publication Bias references
2004/06/24 Lost page
2004/06/24 Pap smears for women without a cervix
2004/06/23 The impact of XML on Statistics
2004/06/22 Missing values
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
2004/05/26 What is information theory
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
2004/05/11 Information Theory Examples
2004/05/11 Information Theory Models
2004/05/11 Notes from JSM 2004
2004/05/11 Response to Olshansky and Dossey
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
2004/04/08 Interactions in logistic regression
2004/04/07 Temporality of Causes
2004/03/23 Constraints on Randomization
2004/03/18 Evidence-based lessons learned from Cardiology
2004/03/17 Steps in a typical microarray analysis
2004/03/15 EM Algorithm
2004/03/12 Steps for establishing a quality control program
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
2004/01/13 Steps in establishing validity/reliability
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?
2003/12/31 Pages written in 2003
2003/11/27 Steps in a typical equivalence data analysis
2003/11/26 Accuracy of computations
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
2003/09/08 An introduction to diagnostic testing
2003/07/29 SPSS syntax for Poisson Regression, Marta Garcia-Granero, PhD
2003/07/28 Mean or median?
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
2003/05/09 Cluster randomization
2003/05/06 Maximum likelihood estimation
2003/05/06 Maximum likelihood estimation
2003/04/30 Why informed consent is important
2003/04/23 Building a complex model
2003/02/03 Coding race/ethnicity
2003/01/01 Diagnostic
2002/12/31 Pages written in 2002
2002/11/06 Displaying tables of percentages
2002/11/01 Post hoc power
2002/10/24 Likelihood ratio slide rule
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
2002/08/01 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 Privacy concerns in research
2002/07/12 So you want to write a questionnaire
2002/06/24 Interpreting coefficients in a linear regression model
2002/06/24 Lost page
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
2001/12/31 Pages written in 2001
2001/11/05 Statistical Training Opportunities At Children’s Mercy Hospital
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 Confidence interval with zero events
2001/01/19 The minimal impact of population size on power and precision
2001/01/15 Writing the methods section of your grant
2001/01/09 Odds ratio versus relative risk
2001/01/01 Documenting negative results in a research paper
2001/01/01 Ethics of a placebo group
2001/01/01 Quick sample size calculations
2001/01/01 Three things you need for a power calculation
2000/12/31 Pages written in 2000
2000/12/27 Stats
2000/12/27 Stats
2000/12/27 Stats
2000/12/27 Stats
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 What is the Kaplan Meier curve?
2000/02/02 Links from other sites
2000/01/28 Acknowledgements
2000/01/28 Copyright notice
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 Association versus causation
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 My resume
2000/01/01 Obsolete webpages
1999/12/31 Pages written in 1999
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 Importing databases into SPSS
1999/08/18 R-squared
1999/08/18 Raynald’s SPSS Tools
1999/04/18 T-test
1999/01/15 Merging files in SPSS
1999/01/01 (Being updated)
0001/01/01 A false sense of frugality