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 ...

A new paper from Nick J. Broers of Maastricht University argues that the size of the effects measured in psychology experiments is essentially meaningless. An 'effect size' is simply the magnitude of ...

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 ...

Low statistical power undermines the purpose of scientific research; it reduces the chance of detecting a true effect. Perhaps less intuitively, low power also reduces the likelihood that a ...

Please provide your email address to receive an email when new articles are posted on . Differences between individuals with autism and those without have lessened over time, which may be tied to ...

Standard effect sizes are more meaningful outcomes in Alzheimer's disease drug trials than the widely used metric of percent slowing of decline, an analysis suggested. In recent trials of Alzheimer's ...

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.

In 2015, researcher John Hattie updated his seminal research Visible Learning. Hailed as “teaching’s Holy Grail,” 1 Hattie synthesized 15 years of research on more than 800 meta-analysis about what ...