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In addition to examining the
overall results of combined studies in a meta-analysis, it is also important to look for
potential moderators, even in the absence of heterogeneity. Categorical models for
examining potential moderators in meta-analysis consist of ANOVA like models for assessing
within and between-group differences. Weighted least-squares regression models are used to
examine associations and potential predictors of the primary outcome. For more information
on moderator analysis see Hedges LV, Olkin I. Statistical methods for meta-analysis.
San Diego, California Academic Press, 1985. |