Effect size
A quantitative measure of the magnitude of a difference, association, or model effect.
How to interpret it
Report the exact definition because measures such as Cohen's d, eta squared, odds ratios, and correlations answer different questions.
Related practical guides
- How to Report p Values, Confidence Intervals, and Effect Sizes in APA 7
- Eta Squared vs Partial Eta Squared: Which Effect Size Should You Report?
- Confidence Intervals for Proportions: Wald, Wilson, and Exact Methods