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

Dr. Gerta Rücker ruecker @end|ng |rom |mb|@un|-|re|burg@de
Wed Feb 2 11:32:42 CET 2022

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] On
>> 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 can
>> gather the number of studies, average effect size and number of participants or
>> is it more appropriate to simply do a systematic review of meta-analyses to five
>> 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-en/employees.html?imbiuser=ruecker

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