Heterogeneity Assessment

Fixed vs. random effects models and moderator analysis.

Questions this Concept answers

Why does a random-effects model use wider confidence intervals than a fixed-effects model for the same set of studies?

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Interpreting Heterogeneity Statistics (Q, I^2, τ^2) in Meta-Analysis

Heterogeneity in meta-analysis refers to true variability in effect sizes across studies beyond what random sampling error alone would predict, and is quantified by three complementary statistics: Q …