[R-meta] question on multilevel model results
Hello Michael, I assume that tau^2 in multilevel models is divided into tow: 1. tau^2 _1 for level 3 that is between-cluster variance equal to between study heterogeneity 2, tau^2_2 for level 2 that is within study variance or within study heterogeneity. Is this correct? Thanks a lot. Kind regards, Gabriel
On Thu, Jul 27, 2023 at 3:31?PM Gabriel Cotlier <gabiklm01 at gmail.com> wrote:
Dear Michael, Yes, Thank you!! It is indeed very useful for I^2 in multilevel models. But I was also wondering how to obtain Tau and Tau-squared in multilevel models? And if such a thing is possible? Kind regards, Gabriel On Thu, Jul 27, 2023 at 1:22?PM Michael Dewey <lists at dewey.myzen.co.uk> wrote:
Dear Gabriel Does http://www.metafor-project.org/doku.php/tips:i2_multilevel_multivariate help? Michael On 27/07/2023 08:18, Gabriel Cotlier via R-sig-meta-analysis wrote:
Hello all, I would like to ask why, conversely, rma() objects for rma.mv() objects (with and without moderators ) in the summary report do not provide
values
of heterogeneity measures besides Cohen's *Q* such as "tau/hat/ square"
or
"tau/square" or H^2?
Is this maybe because this type of model (rma.mv()) does not allow the
estimation of these measures?
Alternately, could they be calculated separately for rma.mv() objects?
If so, is there a code for doing this ?
Thanks a lot.
Kind regards,
Gabriel
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