Researchers have improved the assessment of consistency in meta-analysis. The improved consistency measure considers statistical power, and it has potential to alter the interpretation of ...

To ensure all arms in a randomized clinical trial have roughly equal percentages of participants from key subgroups, statisticians often stratify patient assignment to each arm and account for these ...

To calculate the statistical power for a given Type I error α, we first use equation (4) to find the critical value λ 1−α and then use equation (5) to calculate ...

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 sample size for ...