[R-meta] Meta-analysis of meta-analyses

Viechtbauer, Wolfgang (SP) wo||g@ng@v|echtb@uer @end|ng |rom m@@@tr|chtun|ver@|ty@n|
Wed Feb 2 11:40:25 CET 2022

Yes, of course - good point.


>-----Original Message-----
>From: Dr. Gerta Rücker [mailto:ruecker using imbi.uni-freiburg.de]
>Sent: Wednesday, 02 February, 2022 11:33
>To: Viechtbauer, Wolfgang (SP); Gladys Barragan-Jason; R meta
>Subject: Re: [R-meta] Meta-analysis of meta-analyses
>Dear all,
>But you could easily identify the overlapping studies, couldn't you? Why
>not simply do a first-order meta-analysis of the union set of all
>studies found?
>(Another, much more intricate problem is overlap between participants of
>different studies ...)
>Am 02.02.2022 um 11:03 schrieb Viechtbauer, Wolfgang (SP):
>> Dear Gladys,
>> This is sometimes called a 'second-order meta-analysis' or simply 'meta-meta-
>analysis'. The tricky part is that the different MAs are likely to include
>overlapping sets of studies, which introduces dependency between the various
>pooled estimates that is difficult to account for.
>> Best,
>> Wolfgang
>>> -----Original Message-----
>>> From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces using r-project.org]
>>> Behalf Of Gladys Barragan-Jason
>>> Sent: Wednesday, 02 February, 2022 10:15
>>> To: R meta
>>> Subject: [R-meta] Meta-analysis of meta-analyses
>>> Dear all,
>>> I would like to know whether it is possible to make a meta-analysis of meta-
>>> analysis when several meta-analyses have been done on the same topic if you
>>> gather the number of studies, average effect size and number of participants
>>> is it more appropriate to simply do a systematic review of meta-analyses to
>>> a summary of a specific question/field.
>>> Best wishes,
>>> Gladys
>>> --
>>> ------------------------------------------
>>> Gladys Barragan-Jason, PhD.  Website / Site web
>>> Station d'Ecologie Théorique et Expérimentale (SETE)
>>> CNRS de Moulis
>> _______________________________________________
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>Dr. rer. nat. Gerta Rücker, Dipl.-Math.
>Guest Scientist
>Institute of Medical Biometry and Statistics,
>Faculty of Medicine and Medical Center - University of Freiburg
>Zinkmattenstr. 6a, D-79108 Freiburg, Germany
>Mail:     ruecker using imbi.uni-freiburg.de
>Homepage: https://www.uniklinik-freiburg.de/imbi-

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