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Handbook of Meta-analysis in Ecology and Evolution$
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Julia Koricheva, Jessica Gurevitch, and Kerrie Mengersen

Print publication date: 2013

Print ISBN-13: 9780691137285

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691137285.001.0001

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Effect Sizes: Conventional Choices and Calculations

Effect Sizes: Conventional Choices and Calculations

(p.61) 6 Effect Sizes: Conventional Choices and Calculations
Handbook of Meta-analysis in Ecology and Evolution

Michael S. Rosenberg

Hannah R. Rothstein

Jessica Gurevitch

Princeton University Press

One of the fundamental concepts in meta-analysis is that of the effect size. An effect size is a statistical parameter that can be used to compare, on the same scale, the results of different studies in which a common effect of interest has been measured. This chapter describes the conventional effect sizes most commonly encountered in ecology and evolutionary biology, and the types of data associated with them. While choice of a specific measure of effect size may influence the interpretation of results, it does not influence the actual inference methods of meta-analysis. One critical point to remember is that one cannot combine different measures of effect size in a single meta-analysis: once you have chosen how you are going to estimate effect size, you need to use it for all of the studies to be analyzed.

Keywords:   meta-analysis, effect size, ecology, evolutionary biology

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