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 ...

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.

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 ...