[R-sig-ME] different covariance for different groups

[David Afshartous]

Eva,
There are several threads, search the words below and also see the 
summary I provided in the link.
Cheers,
David

https://stat.ethz.ch/pipermail/r-sig-mixed-models/2007q3/000248.html

random effect variance per treatment group in lmer
heteroscedastic model in lme4
Stratifying level-1 variance with lmer()
different random effects variances for outcomes and groups
Behavior of coef() for lmer() model w/ level-2 variance stratified



On 03/04/2011 04:40 AM, eva petkova wrote:
> Dear group,
>
> I would like to fit a model with random slope and intercept for each
> subject, but would like to have different random effects covariance for my
> two different groups.  Can you tell me what is the syntax to do that?
>
> Thank you and my apologies for bothering you with this questions -- i am
> sure it is somewhere in the archives, but i could not find it.
>
> kind regards
>
> eva
>
> 	[[alternative HTML version deleted]]
>
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-- 
David Afshartous, Ph.D.
Research Associate Professor
School of Medicine
Department of Biostatistics
Vanderbilt University