Carlijn Wibbelink <wibbelt...@hotmail.com> wrote : Dear Carlijn I think that if you set sigma2 to a vector of length 2 it will be possible.
> Hi all, > > I have a question about metafor and the rma.mv function. I have fitted a > multivariate model (effect sizes are nested within studies) and I've found two > variances: > > Variance Components: > estim sqrt nlvls fixed factor > sigma^2.1 0.0257 0.1602 72 no y > sigma^2.2 0.0694 0.2635 10 no ID > > I want to test whether there is significant variantion between the effect > sizes > within studies (sigma^2.1: 0.0257) and/or between studies (sigma^2.2: 0.0694). > In metaSEM you can fix for example the variance within studies (sigma^2.1) to > zero to test whether there is a significant difference in fit between the > models > (and if so, then there is significant heterogeneity between the effect sizes > within studies). I was wondering if this is also possible in metafor. If I fix > sigma2 to zero, then both variances are fixed to zero. However, I want to fix > only one variance to zero. > I hope that someone can help me. Thank you in advance! > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org > mailing list -- To UNSUBSCRIBE and more, see > 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. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
