[R-meta] Exclude answer category from moderation test

-----Original Message-----
From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces at r-project.org] On
Behalf Of Wiertsema, M.
Sent: Friday, 24 June, 2022 14:21
To: r-sig-meta-analysis at 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!

Best,
Maria Wiertsema

--
PhD student | University of Groningen | Youth Studies | Grote
Rozenstraat 38 | email: m.wiertsema at rug.nl | phone: 050 - 363 3182

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").

Best,
Wolfgang

-----Original Message-----
From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces at r-project.org] On
Behalf Of Wiertsema, M.
Sent: Friday, 24 June, 2022 14:21
To: r-sig-meta-analysis at 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!

Best,
Maria Wiertsema

--
PhD student | University of Groningen | Youth Studies | Grote
Rozenstraat 38 | email: m.wiertsema at rug.nl | phone: 050 - 363 3182

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").

Best,
Wolfgang

-----Original Message-----
From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces at r-project.org] On
Behalf Of Wiertsema, M.
Sent: Friday, 24 June, 2022 14:21
To: r-sig-meta-analysis at 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!

Best,
Maria Wiertsema

--
PhD student | University of Groningen | Youth Studies | Grote
Rozenstraat 38 | email: m.wiertsema at rug.nl | phone: 050 - 363 3182