[R-meta] Separate tau for each subgroup in mixed-effect models

[James Pustejovsky]

Hi Arthur,

Yes, these sorts of models are now supported in metafor::rma.uni(). For
details, see
https://wviechtb.github.io/metafor/reference/rma.uni.html#location-scale-models
For a sub-group analysis with a categorical moderator called `mod`, the
syntax would look something like
rma.uni(yi = yi, sei = sei, mods = ~ mod, scale = ~ mod, data = dat, method
= "REML")

Best,
James

On Wed, Aug 31, 2022 at 6:43 PM Arthur Albuquerque <arthurcsirio using gmail.com>
wrote:

> Hi all,
>
> I plan to fit a mixed-effects meta-regression model with metafor::rma().
> The moderator would be categorical (3 subgroups). If I’m not mistaken,
> rma() estimates a common tau^2 across subgroups.
>
> Is it possible to estimate a separate tau for each subgroup?
>
> I believe it is possible in the {meta} package through the tau.common
> argument (https://cran.r-project.org/web/packages/meta/meta.pdf).
>
> Thanks,
>
> Arthur M. Albuquerque
>
> Medical student
> Universidade Federal do Rio de Janeiro, Brazil
>
>
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