[R-meta] Quick question about multiple independent samples within one study

Viechtbauer, Wolfgang (SP) wolfg@ng@viechtb@uer @ending from m@@@trichtuniver@ity@nl
Thu Dec 13 15:24:13 CET 2018

I would suggest to use a multilevel model for this. This is in fact the perfect application of the three-level model described by Konstantopoulos (2011):


So, in this case, we would add random effects for studies and groups within studies.


>-----Original Message-----
>From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces using r-
>project.org] On Behalf Of Anna-Lena Schubert
>Sent: Thursday, 13 December, 2018 9:49
>To: r-sig-meta-analysis using r-project.org
>Subject: [R-meta] Quick question about multiple independent samples
>within one study
>Hi everyone,
>in my current meta-analysis, I'm looking at a single DV in each study.
>However, some studies report multiple samples (e.g., children and
>adults). The samples are utterly independent, but the measures used
>across samples are equal. Would you suggest that I treat those studies
>as correlated in a random-effects model or can I treat them as unrelated
>as the samples are independent of each other?

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