[R-meta] Exclude answer category from moderation test

Viechtbauer, Wolfgang (NP) wo||g@ng@v|echtb@uer @end|ng |rom m@@@tr|chtun|ver@|ty@n|
Fri Jun 24 15:28:54 CEST 2022

Dear Maria,

If you want to exclude the studies where the moderator is equal to 'x' from the analysis, then you could use the 'subset' argument (e.g., subset=moderator!="x").


>-----Original Message-----
>From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces using r-project.org] On
>Behalf Of Wiertsema, M.
>Sent: Friday, 24 June, 2022 14:21
>To: r-sig-meta-analysis using r-project.org
>Subject: [R-meta] Exclude answer category from moderation test
>Hi everyone,
>Perhaps a silly question, but I cannot seem to find the answer I need.
>So here's my question: I have a certain variable with three answer
>categories (x, y, and z). Now, I want to perform a moderation test
>based on this variable but I only want to compare Y and Z in this
>moderation test. Is there a way to exclude answer option 'x' in the
>moderator analysis via code?
>I know I can also adjust my data set and create a new variable with
>only the options 'y' and 'z', but I was wondering if it could be
>easier with the metafor package.
>I hope anyone knows this!
>Many thanks in advance!
>Maria Wiertsema
>PhD student | University of Groningen | Youth Studies | Grote
>Rozenstraat 38 | email: m.wiertsema using rug.nl | phone: 050 - 363 3182

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