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Journal of Pediatric Psychology Advance Access originally published online on February 16, 2009
Journal of Pediatric Psychology 2009 34(9):917-928; doi:10.1093/jpepsy/jsp004
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© The Author 2009. Published by Oxford University Press on behalf of the Society of Pediatric Psychology. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

How to Select, Calculate, and Interpret Effect Sizes

Joseph A. Durlak

Loyola University Chicago

All correspondence concerning this article should be addressed to Joseph A. Durlak, Department of Psychology, Loyola University Chicago, 6525 N. Sheridan Road, Chicago, IL 60626, USA. E-mail: jdurlak{at}luc.edu.


  Abstract

The objective of this article is to offer guidelines regarding the selection, calculation, and interpretation of effect sizes (ESs). To accomplish this goal, ESs are first defined and their important contribution to research is emphasized. Then different types of ESs commonly used in group and correlational studies are discussed. Several useful resources are provided for distinguishing among different types of effects and what modifications might be required in their calculation depending on a study's purpose and methods. This article should assist producers and consumers of research in understanding the role, importance, and meaning of ESs in research reports.

Key words: clinical significance; effect size; meta-analysis; statistics.

Received April 8, 2008; revision received January 9, 2009; accepted January 10, 2009


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