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 ...

Furthermore, we will define each component of a power analysis and discover how to find the information necessary to complete a sample size calculation. Then, we will explore how to apply this ...

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 in a ...

Because the number of published clinical trials on coronavirus disease 2019 (COVID-19) patients has been increasing rapidly, I have reviewed all these trials published between Jan. 1, 2020, and Mar.

A meta-analysis of two factor analysis outcome measures, the percentage of variance accounted for and the average (absolute) factor loading, in 803 substantive factor analyses was undertaken. The ...

For a desired power of detecting the association between a disease and several potential risk factors in case-control studies, Yang (1978, Biometrika 65, 635-640) and Halperin (1980, Biometrika 67, ...