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dc.contributor.author	Rosenthal, Robert
dc.contributor.author	Rosnow, Ralph L.
dc.contributor.author	Rubin, Donald
dc.date.accessioned	2009-07-27T18:59:24Z
dc.date.issued	2000
dc.identifier.citation	Rosnow, Ralph L., Robert Rosenthal, and Donald B. Rubin. 2000. Contrasts and correlations in effect-size estimation. Psychological Science 11(6): 446-453.	en
dc.identifier.issn	0956-7976	en
dc.identifier.issn	1467-9280	en
dc.identifier.uri	http://nrs.harvard.edu/urn-3:HUL.InstRepos:3199067
dc.description.abstract	This article describes procedures for presenting standardized measures of effect size when contrasts are used to ask focused questions of data. The simplest contrasts consist of comparisons of two samples (e.g., based on the independent t statistic). Useful effect-size indices in this situation are members of the g family (e.g., Hedges's g and Cohen's d) and the Pearson r. We review expressions for calculating these measures and for transforming them back and forth, and describe how to adjust formulas for obtaining g or d from t, or r from g, when the sample sizes are unequal. The real-life implications of d or g calculated from t become problematic when there are more than two groups, but the correlational approach is adaptable and interpretable, although more complex than in the case of two groups. We describe a family of four conceptually related correlation indices: the alerting correlation, the contrast correlation, the effect-size con-elation, and the BESD (binomial effect-size display) correlation. These last three correlations are identical in the simple setting of only two groups, but differ when there are move than two groups.	en
dc.description.sponsorship	Psychology	en
dc.language.iso	en_US	en
dc.publisher	Blackwell Publishers	en
dc.relation.isversionof	http://dx.doi.org/10.1111/1467-9280.00287	en
dash.license	LAA
dc.title	Contrasts and Correlations in Effect-size Estimation	en
dc.relation.journal	Psychological Science	en
dash.depositing.author	Rosenthal, Robert

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  Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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