Bernd, Thanks. I believe this will do what I need, but do you know how I can set up my meta object so that the meta is performed on each subgroup individually? I can get the overall meta of all 6 observations, or I can get a separate meta of each subgroup using the subset command, but I can't get subgroup A, subgroup B, and subgroup C all into the same object. In order to use the plot feature it appears I need a byvar, so I think I'll need them all in the same object.
subgroup study beta se subgroupA site1 -0.35 0.12 subgroupA site2 -0.34 0.1 subgroupB site1 -0.28 0.06 subgroupB site2 -0.29 0.07 subgroupC site1 0.34 0.03 subgroupC site2 0.36 0.04 Generic inverse variance meta-analysismetagen(beta, se, studlab=study, sm="OR") Thanks, Steve --- On Tue, 3/10/09, Weiss, Bernd <bernd.we...@uni-koeln.de> wrote: From: Weiss, Bernd <bernd.we...@uni-koeln.de> Subject: Re: [R] perform subgroup meta-analysis and create forest plot displaying subgroups To: slubi...@yahoo.com, r-help@r-project.org Date: Tuesday, March 10, 2009, 2:31 AM Steven Lubitz schrieb: > Hello, I'm using the rmeta package to perform a meta analysis using > summary statistics rather than raw data, and would like to analyze > the effects in three different subgroups of my data. Furthermore, I'd > like to plot this on one forest plot, with corresponding summary > weighted averages of the effects displayed beneath each subgroup. > > I am able to generate the subgroup analyses by simply performing 3 > separate meta-analyses with the desired subset of data. However, I > can't manage to plot everything on the same forest plot. Maybe I'm wrong but the 'forest'-function (package 'meta', <http://cran.at.r-project.org/web/packages/meta/meta.pdf>) should be able to do what you want. I guess you could be interested in the 'byvar' argument. Bernd [[alternative HTML version deleted]]
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