Being updated
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2019/01/20
(Being updated)
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2013/11/02
Testing an R function
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2013/09/10
Can I focus on a subset of conditions in my experiment
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2013/09/03
Confusion about BUGS
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2013/08/26
I get a letter published in the Kansas City Star
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2013/08/14
Resource for statisticians called as legal experts in a trial
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2013/08/07
Data sources for a proposed course on secondary data analysis
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2013/07/31
Calculating predicted probabilities from a logistic regression model
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2013/07/29
R code for estimating the duration of a clinical trial with a fixed sample size
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2013/07/29
R code for estimating the sample size of a clinical trial with a fixed duration
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2013/04/02
Counting squares
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2013/03/25
A complex subgroup definition
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2013/02/19
Placing the mind of a statistician into software
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2013/01/14
What does it really mean to say that a mean of a large number of variables is approximately normal
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2012/12/12
A single wildly large value makes you less confident that the mean of your data is large
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2012/12/08
Animations in R
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2012/11/21
Data sharing
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2012/10/10
Mapping my runs in R
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2012/10/01
Debating the validity of snowball sampling
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2012/09/19
Borderline p-values
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2012/09/19
When should I use the Fisher’s Exact Test and when should I use the Chi-Square Test
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2012/09/12
What’s the name of the test for comparing two proportions?
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2012/08/27
Data management in R versus SAS
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2012/07/27
Whiskers in a boxplot
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2012/05/22
(Being updated)
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2012/05/17
Reviewing how the binomial and negative binomial distributions work
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2012/05/15
A simple example of change of variable
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2012/05/12
A fishy story about randomization
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2012/04/22
Accrual with refusals, exclusions, or dropouts
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2012/04/19
The simple accrual model, redefined
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2012/04/18
BUGS model for the simple Poisson accrual model
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2012/04/13
Fitting the homogenous accrual model in BUGS
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2012/04/09
Bad scaling choices for the SPSS ROC curve
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2012/04/03
Iowa talk on accrual
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2012/03/21
Those pesky tab characters
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2012/03/19
Free consultation means no co-authorship?
-
2012/03/07
Making predictions based on just the correlation
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2012/02/23
How sample size calculations are reported in the literature
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2012/02/08
Questions for a panel on statistical consulting
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2012/01/27
Promoting your consulting career in the era of web 2.0
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2012/01/25
Honorable mention for my R code on accrual
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2012/01/12
Arguing with the material in an ethics training program
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2012/01/09
What to report when SPSS says the p-value is zero
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2012/01/04
Post hoc power persists because peer-reviewers demand it
-
2012/01/01
A very silly graph
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2011/12/16
Discrepancies in the chisquare test
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2011/11/21
Why is a 20% dropout rate bad?
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2011/11/07
Looking at another grant opportunity
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2011/10/31
Meta-analysis with non-comparable procedures
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2011/10/20
My entry into the Applications of R in Business Competition
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2011/10/11
Conditional Frailty Models
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2011/09/13
Draft grant submission on patient accrual
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2011/09/12
Sharing the same classroom for five consecutive years
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2011/08/13
Banning editorials and clinical reviews from authors with industry ties
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2011/06/14
Cartoon about placebos
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2011/06/02
When you’re stuck writing major sections of another person’s grant
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2011/05/11
Is it ethical to provide statistical consulting on a disseration to a Ph.D. candidate
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2011/05/09
How independent consulting is different
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2011/01/01
Good news about my second book proposal
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2010/12/20
Creating LaTex formulas on the fly
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2010/12/09
Location of my UMKC office
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2010/12/01
Are certain CAM therapies undeserving of further study
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2010/12/01
Lost page
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2010/12/01
Lost page
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2010/11/26
Poem to help you remember the quotient rule
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2010/11/25
Transforming the parameter also transforms the prior distribution
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2010/11/22
The odds ratio in logistic regression is the opposite of what it should be
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2010/11/19
BUGS is more than just one program
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2010/11/16
Ambiguity in the definition of the exponential distribution
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2010/11/09
The Science-Based Medicine blog defends itself
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2010/11/06
Lost page
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2010/11/03
Would you hire someone who knew theory
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2010/11/02
Lost page
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2010/10/16
Lost page
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2010/10/12
Lost page
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2010/10/04
Poster presentation at the Missouri Technology conference
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2010/10/01
If you knew that failure was not an option what would you do
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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
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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
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2010/08/25
Lost page
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2010/08/19
Is Evidence-Based Medicine too rigid
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2010/08/19
What is a Generalized Estimating Equations Model
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2010/08/16
Competing books to the book I am planning to write
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2010/08/14
What should clients get from you at the end of your first consulting session
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2010/08/11
Glossary for my second book
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2010/08/06
What’s a fair price for SPSS?
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2010/08/05
Fighting the claim that any size difference is clinically important
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2010/07/30
Standard operating procedures for a statistical consulting center
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2010/07/26
Lost page
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2010/07/26
Pooling different measures of risk in a meta-analysis
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2010/07/24
Sample chapter: The first three steps in selecting an appropriate sample size
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2010/07/24
Tentative table of contents for my second book
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2010/07/23
Jumpstart Statistics, a proposal for my second book
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2010/07/21
Salary survey for Biostatisticians
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2010/07/19
What is principal components analysis?
-
2010/07/04
Another counter-intuitive probability problem
-
2010/07/01
Lost page
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2010/06/30
Resources using Stack Overflow
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2010/06/29
Classic references in Statistics
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2010/06/29
The SPSS t-test is confusing
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2010/06/28
Lost page
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2010/06/28
Lost page
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2010/06/28
What I use for talks instead of Powerpoint
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2010/06/16
The futility of small sample sizes for evaluating a binary outcome
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2010/06/11
An example of a bad survey
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2010/06/09
An interesting alternative to power calculattions
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2010/06/08
Minimum sample size needed for a time series prediction
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2010/06/03
Lost page
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2010/05/28
What is the premier conference for statistical consulting
-
2010/05/26
Lost page
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2010/05/24
How I got started in my career as an independent statistical consultant
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2010/05/21
How do I handle criticism
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2010/05/15
How to avoid charges of plagiarism
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2010/05/15
Withdrawing from a study and taking your data with you
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2010/05/14
Lessons learned the hard way: don’t throw good money after bad
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2010/05/03
More discussion on instrumental variables
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2010/04/14
Interpreting p-values in a published abstract, part 1
-
2010/04/14
Quiz about p-values
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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?
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2010/04/05
Should I learn R instead of SAS
-
2010/04/02
Dealing with a large text file that crashes your computer
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2010/03/25
What to say when any data analysis is pointless
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2010/03/22
Calculating weights to correct for over and under sampling
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2010/03/20
Ordinal surprisals
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2010/03/16
Can sex be an outcome variable?
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2010/03/11
Ordinal entropy
-
2010/03/02
Finding duplicate records in a 19 million record database
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2010/02/13
Abstract submitted to Missouri Regional Life Sciences Summit
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2010/02/11
Exponential interpolation
-
2010/02/11
Fan page for The Monthly Mean
-
2010/02/10
Lost page
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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
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2010/02/07
What are the characteristics of a good consultant
-
2010/02/03
Proposed poster for the Missouri Regional Life Sciences Summit
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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
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2010/01/14
Lost page
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2010/01/11
Power calculations for comparison of Poisson counts across two groups
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2010/01/06
What is residual confounding?
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2010/01/01
Lessons learned the hard way. Don’t
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2010/01/01
My life so far, fails to meet expectations
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2010/01/01
What is a good surrogate measure for
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2009/01/01
A simple example of joint and
-
2009/01/01
A sportswriter tackles the Monty Hall problem
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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
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2009/01/01
Developing a website logo
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2009/01/01
DNA binding image
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2009/01/01
Do multiple time points require
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2009/01/01
Drawing simple mathematical graphs
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2009/01/01
Entering and analyzing data from a two by two table
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2009/01/01
Fewer than 10 events per variable
-
2009/01/01
Five points or seven points on a
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2009/01/01
Formula for multiple imputation
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2009/01/01
Generating multinomial random
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2009/01/01
Getting a good cut-off
-
2009/01/01
Good papers for a journal club
-
2009/01/01
I love to write
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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
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2009/01/01
Maybe Powerpoint isn’t so bad
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2009/01/01
New Bioinformatics degree
-
2009/01/01
NYTimes advice on increasing website traffic
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2009/01/01
Power for a three arm experiment
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2009/01/01
Randomly generating simple math
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2009/01/01
Rotating locations
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2009/01/01
Sneaking ineligible patients
-
2009/01/01
Standard error for an odds ratio
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2009/01/01
Tentative training schedule
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2009/01/01
The controversy over
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2009/01/01
The first three steps in
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2009/01/01
The perils of self-evaluation
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2009/01/01
The problem with being too sensitive
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2009/01/01
The surprisal matrix and
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2009/01/01
Two business contacts
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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
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2008/11/05
The Myth of Equipoise in Phase 1 Clinical Trials
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2008/11/05
The Myth of Equipoise in Phase 1 Clinical Trials
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2008/11/01
Components of placebo effect, Randomised controlled trial in patients with irritable bowel syndrome
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2008/11/01
Helping Doctors and Patients Make Sense of Health Statistics
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2008/11/01
Regression with SAS. Additional coding systems for categorical variables
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2008/10/20
Computing a difference between first and last variables
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2008/10/20
Intervening variable
-
2008/10/20
Variables and hypotheses
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2008/09/25
Can I ask you a question
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2008/09/17
Categorizing entropy values
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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
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2008/09/09
Multiple email accounts
-
2008/09/09
Where did you get that formula for the confidence interval
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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
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2008/08/11
Biostatistics or Health Informatics programs in or near Kansas City
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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
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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
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2008/01/01
Anti-intellectualism
-
2008/01/01
Business aspects of an independent
-
2008/01/01
Cytel software has developed a Poisson
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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
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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
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2008/01/01
To be updated
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2008/01/01
To be updated
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2008/01/01
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2008/01/01
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2008/01/01
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2008/01/01
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2008/01/01
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2008/01/01
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2008/01/01
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2008/01/01
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2008/01/01
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2008/01/01
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2008/01/01
Undeclared missing code leads
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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
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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
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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
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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
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2005/10/11
A simple trick in R
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2005/10/10
Responding to a critique of meta-analysis
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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
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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
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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
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2005/08/10
Dates in Excel and R
-
2005/08/03
Converting an odds ratio to a relative risk
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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)
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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)
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2005/08/02
S-PLUS Clinical Safety Miner (March 10, 2005, Model, Software)
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2005/08/01
Information content of a continuous distribution
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2005/07/29
Expected value and moments
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2005/07/29
Overview of evidence-based-medicine
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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
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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)
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2005/06/07
When the F test is significant, but Tukey is not (created 2005-09-09)
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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
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2005/05/23
Another open site closes
-
2005/05/20
Adjusting for covariate imbalance
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2005/05/19
Computing normal probabilities
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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
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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
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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
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2005/02/09
Continuous variables in a logistic regression model
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2005/02/08
A small p-value does not mean a large difference
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2005/02/03
Sampling the entire population
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2005/02/01
A surprising application of the harmonic mean
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2005/01/27
A false sense of frugality
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2005/01/27
Statistical Evidence in Medical Trials
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2005/01/27
Statistical Evidence in Medical Trials
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2005/01/25
Re-weighting the data
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2005/01/21
How good is your intuition?
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2005/01/21
Summary Receiver Operating Characteristic Curve
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2005/01/19
The Digital Object Identifier
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2005/01/17
More thoughts on equipoise
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2005/01/13
Small relative risks
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2005/01/12
Forest plots
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2005/01/06
Odds ratios less than one
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2005/01/04
Spectrum Bias
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2005/01/03
Monetary incentives
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2005/01/01
A controversial meta-analysis
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2005/01/01
Ethical principles for Complementary and Alternative Medicine
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2005/01/01
Examples of confidence intervals
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2005/01/01
Media interview tips
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2005/01/01
More on conflicts of interest
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2005/01/01
Standard deviation versus standard error (May 16, 2005)
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2005/01/01
Statistical Analysis of Microarrays by Insightful Software
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2005/01/01
The ethics of randomization
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2005/01/01
The S+ CorrelatedData Library (May 19, 2005)
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2005/01/01
Two articles in the Chance Wiki
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2005/01/01
What alternative medicine can teach us about evidence-based medicine
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2004/12/29
Testing for side effects
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2004/12/28
Weblinks for December 2004
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2004/12/24
Acuity microarray analysis software
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2004/12/24
Can you recommend a good book?
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2004/12/24
Design and analysis of pilot studies
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2004/12/24
Is the randomized trial the gold standard for research?
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2004/12/24
Outcomes research
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2004/12/21
Subgroup analysis
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2004/11/29
Confidence intervals
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2004/11/29
Lost page
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2004/11/17
Ratio of observations to independent variables
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2004/07/08
Testing for side effects
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2004/06/24
Lost page
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2004/05/11
Information Theory Examples
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2004/05/11
Information Theory Models
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2004/05/11
Notes from JSM 2004
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2004/05/11
Response to Olshansky and Dossey
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2004/01/01
Craniosacral therapy
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2004/01/01
Deaf chairs, lost cake recipes, and a letter from Maria.
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2004/01/01
I hate PowerPoint
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2004/01/01
In vitro fertilization prayer study
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2004/01/01
In vitro fertilization prayer study
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2004/01/01
My efforts to kill PowerPoint
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2004/01/01
Recent updates
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2004/01/01
Weblog entries from the 2004 JSM
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2004/01/01
What’s a good value for Cronbach’s Alpha?
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2003/09/08
An introduction to diagnostic testing
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2002/06/24
Lost page
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2001/11/02
Unequal group sizes
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2001/10/11
BMJ letter
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2001/10/11
Problems with a very small sample
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2001/10/11
Steps in a descriptive model
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2001/07/30
Parametric versus nonparametric tests
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2001/07/30
Web polls
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2001/01/24
Loading ODBC drivers from the Microsoft Data Access Pack
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2001/01/19
The minimal impact of population size on power and precision
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2001/01/15
Writing the methods section of your grant
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2001/01/09
Odds ratio versus relative risk
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2001/01/01
Documenting negative results in a research paper
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2001/01/01
Ethics of a placebo group
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2001/01/01
Quick sample size calculations
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2001/01/01
Three things you need for a power calculation
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1999/01/01
(Being updated)
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1999/01/01
(Being updated)
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1999/01/01
(Being updated)
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1999/01/01
Steps for establishing a quality control program
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1999/01/01
Steps in a typical Bayesian model
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1999/01/01
Steps in establishing validity/reliability
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1998/01/01
Lost page
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1998/01/01
Lost page
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1998/01/01
Lost page
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0001/01/01
Lost page