Prof. Dewey, sorry for the trivial question and many thank for the replay.
> Using which package? In this case I used the meta package, but I know that for all but the DerSimonian-Laird method the R function rma.uni of R package metafor is called internally. > What did you expect the weights to sum to, I wonder. I think that, to better explain the influence of single study in pooling the effect size, the weight are presented as percentage of the sum of total weight of each study, but I ask for a confirm. Nevertheless, I ask if it is possible to obtain for each study the value of the absolute weight, other than the relative weight, or at least the absolute value of the sum of the weights. Sincerely Mario Petretta >Department of Translational Medical Sciences >Naples University Federico II >Italy > Message: 2 Date: Thu, 17 Apr 2014 12:43:06 +0100 From: Michael Dewey <i...@aghmed.fsnet.co.uk> To: petre...@unina.it, r-help@r-project.org Subject: Re: [R] interpreting weight in meta-analysis of proportion Message-ID: <zen-1wakio-0009tp...@smarthost01b.mail.zen.net.uk> Content-Type: text/plain; charset="us-ascii"; format=flowed At 16:30 16/04/2014, petre...@unina.it wrote: >Dear all, > >I use R 3.0 for Windows. > >I performed a meta-analysis of the prevalence (single proportion) >reported in 14 different studyes using the command: > >res<-metaprop(case,n,sm="PFT", comb.fixed=FALSE, comb.random=TRUE, >studlab<- paste(Study)) Using which package? >print(res) > >A referee ask a brief explanation of the W-statistic reported in the >results, in particular, why the summ of the individual weights of all >the studies is 100%. What did you expect the weights to sum to, I wonder. >Any suggestion is welcome. > > >-- >Mario Petretta >Department of Translational Medical Sciences >Naples University Federico II >Italy > > Michael Dewey i...@aghmed.fsnet.co.uk http://www.aghmed.fsnet.co.uk/home.html ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
