[R] Metafor: Differences between two categories of a moderator

From: Holger Steinmetz <Holger.steinmetz_at_web.de>
Date: Tue, 31 May 2011 03:52:00 -0700 (PDT)


Hi there,

when using the metafor package for testing mixed effects models with categorical moderators, I get a regression table reporting betas. These betas are mean differences between a certain category in the effect size to the reference category (intercept). In addition, the QM-tests allows testing if the differences between all the categories TO the reference are significant or not.

The problem is that if there are differences AMONG the categories (but not to the reference), the QM-test will not notice that. Hence, my question is if there is an option to test differences among specific categories (e.g., simple subgroup comparison).

Best,
Holger

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Received on Tue 31 May 2011 - 10:54:44 GMT

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