Sample size justification

• 2023/11/06 Documenting a sample size justification
• 2023/10/17 Illustration of the rule of 16
• 2022/05/08 What Influences Saturation? Estimating Sample Sizes in Focus Group Research
• 2022/05/08 What Influences Saturation? Estimating Sample Sizes in Focus Group Research
• 2022/01/17 How Big of a Sample Size do you need for Factor Analysis
• 2016/03/30 Reporting and methodological quality of sample size calculations in cluster randomized trials could be improved: a review
• 2016/03/30 The number of subjects per variable required in linear regression analyses
• 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
• 2015/09/24 PS: Power and Sample Size Calculation
• 2015/05/11 Validating a test of diabetes
• 2014/12/10 Requiring fuel gauges. A pitch for justifying impact evaluation sample size assumptions
• 2014/08/13 Sample size of 12 per group rule of thumb for a pilot study
• 2014/07/22 An example of a simple sample size justification
• 2014/06/16 MLPowSim software
• 2014/06/16 Sample size for a study of reproducibility
• 2014/04/30 Pmean: The IRB questions my sample size calculation
• 2014/04/16 Stretching an already borderline sample size
• 2014/02/10 Why randomized controlled trials fail but needn’t: 2. Failure to employ physiological statistics, or the only formula a clinician-trialist is ever likely to need (or understand!)
• 2014/01/22 No power calculation for a Phase II trial
• 2014/01/01 Some simple examples of manipulating the axes in a graph
• 2013/12/18 Sample size for comparing two diagnostic tests
• 2012/01/06 Is sample size justification really different for animal studies compared to human studies?
• 2011/12/20 Unrealistic scenarios for sample size calculations
• 2011/11/22 Justifying the sample size in a qualitative research study
• 2010/11/02 Justifying the sample size in an equivalence study
• 2010/10/16 Lost page
• 2010/08/05 Fighting the claim that any size difference is clinically important
• 2010/07/24 Sample chapter, the first three steps in selecting an appropriate sample size
• 2010/07/24 Sample chapter: The first three steps in selecting an appropriate sample size
• 2010/06/09 An interesting alternative to power calculattions
• 2010/06/03 Computing power for an interaction in linear regression
• 2010/01/27 Finding the standard deviation for a power calculation
• 2010/01/15 The first three steps in selecting an appropriate sample size
• 2010/01/11 Power calculations for comparison of Poisson counts across two groups
• 2009/09/14 Power for a three arm experiment
• 2008/10/19 Example of power calculation for a repeated measures design
• 2008/10/11 Example of power calculation for a repeated measures design
• 2008/08/20 Source for sample size formula
• 2008/07/09 Where did that standard deviation come from
• 2008/01/09 Too much power and precision?
• 2007/08/09 Justifying the sample size for a microarray study
• 2007/04/09 What is an adequate sample size for establishing validity and reliability?
• 2007/03/26 IRB review of a pilot study
• 2007/01/30 Do your own power and sample size calculations
• 2007/01/03 Variable cluster sizes and their impact on sample size calculations
• 2006/12/29 Be sure to account for dropouts in your sample size calculation
• 2006/11/02 Additions and improvements to my web pages
• 2006/10/23 Is a 10% shortfall in sample size critical?
• 2006/07/28 R libraries for sample size justification
• 2006/03/30 How many charts should I pull?
• 2005/10/03 Sample size for a binomial confidence interval
• 2005/08/12 Sample size for a binary endpoint
• 2005/07/11 Confidence interval for a correlation coefficient
• 2005/03/08 Sample size calculation for a nonparametric test
• 2004/11/24 Unequal sample sizes
• 2004/11/05 Confidence intervals for complex research designs
• 2004/09/22 Sample size for an ordinal outcome
• 2004/07/23 Sample size calculations in studies with a baseline
• 2004/07/05 Sample size for a diagnostic test
• 2004/05/20 Sample size calculation example
• 2004/05/13 Sample size for a survival data model
• 2003/05/09 Cluster randomization
• 2003/05/09 Cluster randomization
• 2001/01/19 The minimal impact of population size on power and precision
• 2000/09/28 Sample size for the Mann-Whitney U test
• 2000/08/23 Binary outcome sample size calculations
• 2000/01/26 Sample size for a confidence interval
• 1999/09/03 Sample size for a diagnostic study