Course Topics Power analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

One study did not justify the sample size. 2 One assumed that the treatment can reduce the outcome variable by 40%, but the Cohen’s d effect size should have been provided instead. 3 One study did not ...

Some notes on the behaviour of sample size calculations and power for unequal group sizes This information was omitted from the video and so is included here as text. In many scenarios the ratio of ...

Summary Choosing the proper sample size for an investigation is one of the crucial jobs required of a statistician. Regardless of whether the statistician is deciding the number of patients to select ...

We developed a Bayesian approach to sample size calculations for cross-sectional studies designed to estimate sensitivity and specificity of one or more diagnostic tests. Sample size calculations can ...

This relationship also applies to another statistic sometimes needed for sample size calculations, which relates to variation. Take the case of the pain trial, where we are trying to see whether a ...

We present a simple sample-size formula for weighted log-rank statistics applied to clustered survival data with variable cluster sizes and arbitrary treatment assignments within clusters. This ...