- 2019/01/20 (Being updated)
- 2013/11/02 Testing an R function
- 2013/09/10 Can I focus on a subset of conditions in my experiment
- 2013/09/03 Confusion about BUGS
- 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
- 2013/07/31 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
- 2013/04/02 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
- 2012/12/12 A single wildly large value makes you less confident that the mean of your data is large
- 2012/12/08 Animations in R
- 2012/11/21 Data sharing
- 2012/10/10 Mapping my runs in R
- 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
- 2012/05/22 (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
- 2012/04/22 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
- 2012/04/03 Iowa talk on accrual
- 2012/03/21 Those pesky tab characters
- 2012/03/19 Free consultation means no co-authorship?
- 2012/03/07 Making predictions based on just the correlation
- 2012/02/23 How sample size calculations are reported in the literature
- 2012/02/08 Questions for a panel on statistical consulting
- 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
- 2012/01/04 Post hoc power persists because peer-reviewers demand it
- 2012/01/01 A very silly graph
- 2011/12/16 Discrepancies in the chisquare test
- 2011/11/21 Why is a 20% dropout rate bad?
- 2011/11/07 Looking at another grant opportunity
- 2011/10/31 Meta-analysis with non-comparable procedures
- 2011/10/20 My entry into the Applications of R in Business Competition
- 2011/10/11 Conditional Frailty Models
- 2011/09/13 Draft grant submission on patient accrual
- 2011/09/12 Sharing the same classroom for five consecutive years
- 2011/08/13 Banning editorials and clinical reviews from authors with industry ties
- 2011/06/14 Cartoon about placebos
- 2011/06/02 When you’re stuck writing major sections of another person’s grant
- 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
- 2011/01/01 Good news about my second book proposal
- 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 Lost page
- 2010/12/01 Lost page
- 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 Lost page
- 2010/11/03 Would you hire someone who knew theory
- 2010/11/02 Lost page
- 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
- 2010/08/25 Lost page
- 2010/08/19 Is Evidence-Based Medicine too rigid
- 2010/08/19 What is a Generalized Estimating Equations Model
- 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 Lost page
- 2010/07/26 Pooling different measures of risk in a meta-analysis
- 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
- 2010/07/19 What is principal components analysis?
- 2010/07/04 Another counter-intuitive probability problem
- 2010/07/01 Lost page
- 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 Lost page
- 2010/06/28 Lost page
- 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 Lost page
- 2010/05/28 What is the premier conference for statistical consulting
- 2010/05/26 Lost page
- 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
- 2010/04/14 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
- 2010/02/13 Abstract submitted to Missouri Regional Life Sciences Summit
- 2010/02/11 Exponential interpolation
- 2010/02/11 Fan page for The Monthly Mean
- 2010/02/10 Lost page
- 2010/02/10 Lost page
- 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
- 2010/01/25 Facebook account
- 2010/01/20 Abstracts for a possible upcoming talk
- 2010/01/19 SPSS or Stata?
- 2010/01/17 Where can I find free online textbooks
- 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 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 A simple example of joint and
- 2009/01/01 A sportswriter tackles the Monty Hall problem
- 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 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?
- 2008/12/01 Zotero, The Next Generation Research Tool
- 2008/11/05 Four assumptions of multiple regression that researchers should always test
- 2008/11/05 The Myth of Equipoise in Phase 1 Clinical Trials
- 2008/11/05 The Myth of Equipoise in Phase 1 Clinical Trials
- 2008/11/05 The Myth of Equipoise in Phase 1 Clinical Trials
- 2008/11/01 Components of placebo effect, Randomised controlled trial in patients with irritable bowel syndrome
- 2008/11/01 Helping Doctors and Patients Make Sense of Health Statistics
- 2008/11/01 Regression with SAS. Additional coding systems for categorical variables
- 2008/10/20 Computing a difference between first and last variables
- 2008/10/20 Intervening variable
- 2008/10/20 Variables and hypotheses
- 2008/09/25 Can I ask you a question
- 2008/09/17 Categorizing entropy values
- 2008/09/15 Should I abandon FrontPage?
- 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
- 2008/09/09 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
- 2008/08/28 Checks for data quality using metadata
- 2008/08/20 Where to look for information in a controversial area
- 2008/08/20 Where to look for information in a controversial area
- 2008/08/11 Biostatistics or Health Informatics programs in or near Kansas City
- 2008/08/11 Cumulative entropy as a measure of data quality
- 2008/08/06 Harsh sanctions are only part of the solution
- 2008/08/02 Resources from the Statistical Consulting Section of the American Statistical Association
- 2008/07/23 Godwin’s Law
- 2008/07/23 My very first meta-analysis
- 2008/05/08 Why does a Bayesian approach make sense for monitoring accrual?
- 2008/03/12 ROC curve for an imperfect gold standard
- 2008/01/05 High altitude effects on athletic performance
- 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 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 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 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 To be updated
- 2008/01/01 To be updated
- 2008/01/01 To be updated
- 2008/01/01 To be updated
- 2008/01/01 To be updated
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- 2008/01/01 To be updated
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- 2008/01/01 To be updated
- 2008/01/01 To be updated
- 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?
- 2007/07/28 Bibliography of papers relating to predicting accrual in clinical trials
- 2007/02/27 Stats
- 2007/02/27 Stats
- 2005/12/21 Vote for me
- 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
- 2005/10/14 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
- 2005/10/03 Sample size for a binomial confidence interval
- 2005/09/19 An error slips through the peer review process
- 2005/09/15 Dishonesty in medical research
- 2005/09/15 Free statistics software
- 2005/09/13 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
- 2005/08/10 Dates in Excel and R
- 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 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
- 2005/06/20 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?
- 2005/05/31 The paired availability design
- 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
- 2005/04/19 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 More on the top ten studies in EBM
- 2005/02/22 Taguchi methods
- 2005/02/21 Security tends to be
- 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 A false sense of frugality
- 2005/01/27 Statistical Evidence in Medical Trials
- 2005/01/27 Statistical Evidence in Medical Trials
- 2005/01/25 Re-weighting the data
- 2005/01/21 How good is your intuition?
- 2005/01/21 Summary Receiver Operating Characteristic Curve
- 2005/01/19 The Digital Object Identifier
- 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
- 2005/01/04 Spectrum Bias
- 2005/01/03 Monetary incentives
- 2005/01/01 A controversial meta-analysis
- 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
- 2004/12/29 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 Is the randomized trial the gold standard for research?
- 2004/12/24 Outcomes research
- 2004/12/21 Subgroup analysis
- 2004/11/29 Confidence intervals
- 2004/11/29 Lost page
- 2004/11/17 Ratio of observations to independent variables
- 2004/07/08 Testing for side effects
- 2004/06/24 Lost page
- 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
- 2004/01/01 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?
- 2003/09/08 An introduction to diagnostic testing
- 2002/06/24 Lost page
- 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
- 2001/01/15 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
- 1999/01/01 (Being updated)
- 1999/01/01 (Being updated)
- 1999/01/01 (Being updated)
- 1999/01/01 Steps for establishing a quality control program
- 1999/01/01 Steps in a typical Bayesian model
- 1999/01/01 Steps in establishing validity/reliability
- 1998/01/01 Lost page
- 1998/01/01 Lost page
- 1998/01/01 Lost page
- 0001/01/01 Lost page