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Can J Exp Psychol. 2003 Sep;57(3):221-37.

Effect sizes for experimenting psychologists.

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Temple University, USA.

Erratum in

  • Can J Exp Psychol. 2009 Jun;63(2):123.


This article describes three families of effect size estimators and their use in situations of general and specific interest to experimenting psychologists. The situations discussed include both between- and within-group (repeated measures) designs. Also described is the counternull statistic, which is useful in preventing common errors of interpretation in null hypothesis significance testing. The emphasis is on correlation (r-type) effect size indicators, but a wide variety of difference-type and ratio-type effect size estimators are also described.

[Indexed for MEDLINE]

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