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When is meta-analysis useful? Recurrent issues: Small effect sizes: e.g. average r in ecology and evolution is often lower than 0.20 (Møller & Jennions 2002) Studies on small and/or highly variable sample size Debated theories Møller AP, Jennions MD How much variation can be explained by ecologists and evolutionary biologists? Oecologia 132:
Handbook of Univariate and Multivariate Data Analysis and Interpretation with SPSS. Chapman & Hall. Tabachnick B.G. & Fidell L.S. (2001). Using multivariate statistics. Allyn & Bacon. West B., Welch K.B. & Galecki A.T. (2006). Linear Mixed Models: A Practical Guide Using Statistical Software. Chapman & Hall..

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Flowchart of the general meta-analysis process. *The term ''studies

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Variables Used for the Meta-Analysis (Continued)