[R-meta] Studies that use several formulas to capture the same outcome

[Michael Dewey]

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
> 
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html