Across contemporary cardiovascular clinical trials, the estimates of expected event rates and effect sizes that investigators use to calculate sample sizes—and funding requirements—often come in ...

Readers are often - and understandably - frustrated when it comes to reports of educational experiments and effect sizes. Let’s say a given program had an effect size of +0.30 (or 30% of a standard ...

Basic concepts in hypothesis testing, including effect sizes, type I and type II errors, calculation of statistical power, non-centrality parameter, and applications of these concepts to twin studies.