[R-meta] Multiple use of the same control

Arne Janssen @rne@j@n@@en @ending from uv@@nl
Thu Nov 8 17:34:57 CET 2018

Dear Wolfgang,

Thanks for your reply. As far as I understood your documentation at 
https://wviechtb.github.io/metafor/reference/rma.mv.html, I can do this 
by using struct="CAR", is that correct?

Best wishes,

On 08-Nov-18 16:42, Viechtbauer, Wolfgang (SP) wrote:
> Dear Arne,
> Are you allowing for correlation between the sampling errors over time?
> See, for example:
> Musekiwa, A., Manda, S. O., Mwambi, H. G.,&  Chen, D. G. (2016). Meta-analysis of effect sizes reported at multiple time points using general linear mixed model. PLOS ONE, 11(10), e0164898. doi:10.1371/journal.pone.0164898
> See also: help(dat.ishak2007) and help(dat.fine1993).
> Best,
> Wolfgang
> -----Original Message-----
> From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces using r-project.org] On Behalf Of Arne Janssen
> Sent: Saturday, 03 November, 2018 16:32
> To: 'r-sig-meta-analysis using r-project.org'
> Subject: [R-meta] Multiple use of the same control
> Dear list members,
> I have a similar problem as Lasse Bang ( Follow-up - Dependencies in
> data: multiple studies with overlapping sample sizes).
> I want to do a meta-analysis of studies with  time series, often with
> time series of several treatments and one control time series. To
> include all the treatments in the analysis, I therefore need to use the
> same control time series several times. How can I correct for that?
> I am using  rma.mv with time as one of the modulators and StudyID (the
> publication ID) and SampleID (time series within the same study) as
> random effects, and a continuous-time autoregressive structure.
> Thanks in advance for any advice.
> Best wishes,
> Arne Janssen
> .

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