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Psychol Methods. 2003 Dec;8(4):448-67.

Effect-size indices for dichotomized outcomes in meta-analysis.

Author information

1
U Murcia, Dept of Basic Psychology & Methodology, Faculty of Psychology, Murcia, Spain. jsmeca@um.es

Abstract

It is very common to find meta-analyses in which some of the studies compare 2 groups on continuous dependent variables and others compare groups on dichotomized variables. Integrating all of them in a meta-analysis requires an effect-size index in the same metric that can be applied to both types of outcomes. In this article, the performance in terms of bias and sampling variance of 7 different effect-size indices for estimating the population standardized mean difference from a 2 x 2 table is examined by Monte Carlo simulation, assuming normal and nonnormal distributions. The results show good performance for 2 indices, one based on the probit transformation and the other based on the logistic distribution.

PMID:
14664682
DOI:
10.1037/1082-989X.8.4.448
[Indexed for MEDLINE]
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