[R-meta] pooled vs separate QB statistics

[Filippo Gambarota]

Thanks!

On Mon, 3 Jun 2024 at 09:33, Viechtbauer, Wolfgang (NP) <
wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:

> Hi Filippo,
>
> That is correct.
>
> Best,
> Wolfgang
>
> > -----Original Message-----
> > From: R-sig-meta-analysis <r-sig-meta-analysis-bounces using r-project.org>
> On Behalf
> > Of Filippo Gambarota via R-sig-meta-analysis
> > Sent: Tuesday, May 28, 2024 12:39
> > To: Michael Dewey <lists using dewey.myzen.co.uk>
> > Cc: Filippo Gambarota <filippo.gambarota using gmail.com>; R Special Interest
> Group
> > for Meta-Analysis <r-sig-meta-analysis using r-project.org>
> > Subject: Re: [R-meta] pooled vs separate QB statistics
> >
> > Dear Michael,
> > Thank you. So basically when different tau2 are estimated (either
> > using a multivariate model or scale location model) the Q test for the
> > moderators is the non-pooled test? When a single tau2 is estimated the
> > Q test is the pooled version?
> > Filippo
> >
> > On Tue, 28 May 2024 at 12:31, Michael Dewey <lists using dewey.myzen.co.uk>
> wrote:
> > >
> > > Dear Filippo
> > >
> > > Does
> > >
> https://www.metafor-project.org/doku.php/tips:different_tau2_across_subgroups
> > > help?
> > >
> > > Michael
> > >
> > > On 28/05/2024 11:09, Filippo Gambarota via R-sig-meta-analysis wrote:
> > > > Hi,
> > > > I was reading the two papers (at the end) about categorical
> moderators
> > > > and the omnibus test and despite the conclusion is that the Q (or F)
> > > > test based on the pooled tau2 estimation works better in most cases,
> > > > when k in each moderator level is large and tau2 is expected to
> differ
> > > > across levels, it is better to use the non-pooled method.
> > > >
> > > > Reading the metafor documentation it is not clear to me how to
> > > > implement the non-pooled method. Maybe I am missing something but I
> > > > can change the type of test (z vs t vs knha that takes into account
> > > > tau2 uncertainty) but I see no option to choose the pooled vs non
> > > > pooled tau2 method.
> > > >
> > > > Thanks
> > > > Filippo
> > > >
> > > > Rubio-Aparicio, M., López-López, J. A., Viechtbauer, W.,
> > > > Marín-Martínez, F., Botella, J., & Sánchez-Meca, J. (2020). Testing
> > > > Categorical Moderators in Mixed-Effects Meta-analysis in the Presence
> > > > of Heteroscedasticity. Journal of Experimental Education, 88(2),
> > > > 288–310. https://doi.org/10.1080/00220973.2018.1561404
> > > >
> > > > Rubio-Aparicio, M., Sánchez-Meca, J., López-López, J. A., Botella,
> J.,
> > > > & Marín-Martínez, F. (2017). Analysis of categorical moderators in
> > > > mixed-effects meta-analysis: Consequences of using pooled versus
> > > > separate estimates of the residual between-studies variances. The
> > > > British Journal of Mathematical and Statistical Psychology, 70(3),
> > > > 439–456. https://doi.org/10.1111/bmsp.12092
>


-- 
*Filippo Gambarota, PhD*
Postdoctoral Researcher - University of Padova
Department of Developmental and Social Psychology
Website: filippogambarota.xyz
Research Groups: Colab <http://colab.psy.unipd.it/>   Psicostat
<https://psicostat.dpss.psy.unipd.it/>

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