Message-ID: <83e615e4412d405db0d32a139828388c@agroscope.admin.ch>
Date: 2019-10-02T13:50:19Z
From: m@tthi@s@suter m@iii@g oii @groscope@@dmi@@ch
Subject: Random-effects variance-covariance matrix in lmer?
Hi all
I'm looking for a way to specify a more complex variance-covariance matrix for the random effects in lmer(). For example, in lme() (nlme package), there are the pdMat classes to specify e.g. a compound symmetry (pdCompSym) or a multiple of an identity (pdIdent) structure for the variance-covariance matrix of random effects. Is there a possibility to code an equivalent for lmer()? I'm specifically interested in "compound symmetry" and "multiple of an identity".
I assume that Douglas Bates or Ben Bolker have a distinct answer on that.
Thanks in advance,
Matthias
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Matthias Suter, Dr.sc.nat.
Forage Production and Grassland Systems
Agroscope
Reckenholzstrasse 191, CH-8046 Z?rich
Phone +41 58 468 75 90
Fax +41 58 468 72 01
matthias.suter at agroscope.admin.ch
www.agroscope.ch
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