Finally, we will use 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 sample size ...

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 ...

We consider the problem of calculating power and sample size for tests based on generalized estimating equations (GEE), that arise in studies involving clustered or correlated data (e.g., longitudinal ...