Finally, we will use JMP and G*Power (a free software download) to practice obtaining required sample sizes based on different effect sizes and desired levels of power. Becoming comfortable with ...

The selection of suitable outcomes and sample size calculation are critical factors in the design of a randomised controlled trial (RCT). The goal of this study was to identify the range of ...

The power calculation approach to the determination of sample size for comparing two independent means and two independent proportions in cross-sectional surveys, cohort studies, case-control studies, ...

This study discusses the sample size requirement for the Welch test in the one-way fixed-effect analysis of variance with unknown and possibly unequal variances. The authors propose a formula of ...