[R] Categorical variable in MA

[Bert Gunter]

This list  is about general help for coding in R. I see no indication
of that in your query, which appears to concern statistical
methodology.  In any case, R has a meta-analysis SIG that would seem
to fit your query better:
https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis

Cheers,
Bert

On Tue, Mar 21, 2023 at 9:47 AM Pier-Alexandre Tardif
<pier-alexandre.tardif.1 using ulaval.ca> wrote:
>
> Good morning,
>
> We're undertaking a meta-analysis in which we have an association between a dichotomous outcome (mortality) and a categorical variable with multiple choices (usually between 3 and 4). However, the reference isnt always the same, so we could have study A who present results with A/B/C/D categories with «A» as reference, but study B who presents results with the same A/B/C/D categories but with B as the reference. In the case of a dichotomous variable and an odds ratio, we could ensure a common denominator among the study using 1/OR. Is there any reliable way to do so with a categorical variable (with OR mostly, and possibly relative risks [RR])?
>
> Thanks in advance,
>
> Pier-Alex
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.