-----Original Message-----
From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces at r-project.org] On
Behalf Of Michael Dewey
Sent: Wednesday, 07 July, 2021 12:32
To: Jack Solomon; R meta
Subject: Re: [R-meta] Studies that use several formulas to capture the same
outcome
Dear Jack
My immediate reaction is to use it as a moderator. Am I missing some
problem you have identified?
Michael
On 07/07/2021 03:31, Jack Solomon wrote:
Hello All,
Studies in my study pool have used different formulas to capture the same
construct. Ideally, I want to be able to generalize beyond the set of
formulas used in my study pool.
But, given the structure of my data (below), I wonder whether to use
"formula" as a random effect nested (while it doesn't vary within studies)
in studies or simply use "formula" as a study-level moderator?
```
rma.mv(yi, vi, random = ~ 1 | study/formula)
# OR
rma.mv(yi ~ formula, vi, random = ~ 1 | study)
```
Many thanks, Jack
study formula
1 2
1 2
2 1
2 1
3 1
4 2
4 2