Message-ID: <ad2565f7cdba494584812874449f68b4@UM-MAIL3214.unimaas.nl>
Date: 2022-02-02T10:40:25Z
From: Wolfgang Viechtbauer
Subject: [R-meta] Meta-analysis of meta-analyses
In-Reply-To: <020150f4-d41c-6dd1-9c31-bf3b8fdf1073@imbi.uni-freiburg.de>
Yes, of course - good point.
Best,
Wolfgang
>-----Original Message-----
>From: Dr. Gerta R?cker [mailto:ruecker at 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 ...)
>
>Best,
>
>Gerta
>
>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 at 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 Th?orique et Exp?rimentale (SETE)
>>> CNRS de Moulis
>> _______________________________________________
>> R-sig-meta-analysis mailing list
>> R-sig-meta-analysis at r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis
>
>--
>
>Dr. rer. nat. Gerta R?cker, 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 at imbi.uni-freiburg.de
>Homepage: https://www.uniklinik-freiburg.de/imbi-
>en/employees.html?imbiuser=ruecker