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- Title
Assessing heterogeneity in meta-analysis: Q statistic or I2 index?
- Authors
Huedo-Medina, Tania B; Sánchez-Meca, Julio; Marín-Martínez, Fulgencio; Botella, Juan
- Abstract
In meta-analysis, the usual way of assessing whether a set of single studies is homogeneous is by means of the Q test. However, the Q test only informs meta-analysts about the presence versus the absence of heterogeneity, but it does not report on the extent of such heterogeneity. Recently, the I(2) index has been proposed to quantify the degree of heterogeneity in a meta-analysis. In this article, the performances of the Q test and the confidence interval around the I(2) index are compared by means of a Monte Carlo simulation. The results show the utility of the I(2) index as a complement to the Q test, although it has the same problems of power with a small number of studies.
- Publication
Psychological methods, 2006, Vol 11, Issue 2, p193
- ISSN
1082-989X
- Publication type
Journal Article
- DOI
10.1037/1082-989X.11.2.193