[UPDATE: Thanks to twitter I came across this marvelous book(Jussim, 2012) that does a great job explaining the Pygmalion effect, the controversy around it, and the overall state of research on expectancy effects.  I’ve amended parts of this post based on …

We’ve Been Here Before: The Replication Crisis over the Pygmalion Effect Read more »

Pawel (Pav) Kalinowski and Jerry Lai completed their PhDs a few years back. A recently published Frontiers article (citation below) reports what was primarily Pav’s research on how people understand confidence intervals (CIs). The short version is “for many people, …

The Beautiful Face of a Confidence Interval: The Cat’s Eye Picture Read more »

This is a post about the Diamond Ratio (DR), a simple measure of the extent of heterogeneity in a meta-analysis. We introduced the DR in ITNS. But first, some background. Fixed Effect (FE) model for meta-analysis The diamond at the …

Measuring Heterogeneity in Meta-Analysis: The Diamond Ratio (DR) Read more »