Meta-analysis pools all studies to estimate effect sizes and moderators

Evidence

We recently completed a meta-analysis of intergroup contact effects to review and evaluate this vast research literature (Pettigrew & Tropp, 2004a). … Meta-analysis is a statistical technique for determining the size and consistency of effects across tests of hypotheses. To perform a meta-analysis, researchers first attempt to find every study conducted on a particular topic. Then, they statistically pool the results to examine the overall patterns of effects and to uncover additional variables that moderate those effects (Rosenthal, 1991; Johnson & Eagly, 2000). We applied this technique first to evaluate the overall effects of intergroup contact on prejudice, and then we used this approach to assess support for the specific factors identified by Allport as important for successful contact. — , Rudman, Laurie A - On the Nature of…, 1677

Categorization

• DEFINE: Defines meta-analysis as applied to the contact literature.
• corroborated: 2 independent passages support this claim — , Rudman, Laurie A - On the Nature of…, 1677