meta-analysis-guide

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Meta-Analysis Guide

A skill for conducting rigorous meta-analyses: computing and pooling effect sizes, assessing heterogeneity, evaluating publication bias, and generating forest plots. Follows Cochrane Handbook and PRISMA guidelines.

Effect Size Computation

Common Effect Size Measures

Measure Use Case Formula Interpretation
Cohen's d Mean difference (2 groups) (M1 - M2) / S_pooled 0.2 small, 0.5 medium, 0.8 large
Hedges' g d with small-sample correction d * J(df) Preferred over d for small N
Pearson r Correlation r 0.1 small, 0.3 medium, 0.5 large
Odds Ratio Binary outcomes (ad)/(bc) 1 = no effect
Risk Ratio Binary outcomes (a/(a+b))/(c/(c+d)) 1 = no effect
SMD Standardized mean difference Same as Hedges' g When scales differ

Computing Effect Sizes in Python

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