[R-sig-ME] Heteroscedastic error model

David Duffy davidD at qimr.edu.au
Fri Jun 17 07:16:21 CEST 2011

On Thu, 16 Jun 2011, GRIGNOLA, FERNANDO E [AG/1000] wrote:

> I've done quite a bit of search and have not been able to find
> information on how to fit a model with heteroscedastic error variances.
> For example, I would like to fit a simple model with genotypes
> crossclassified across locations and heterogeneous residual variances.
> It looks like the functionality was there in lme but not anymore in
> lmer. Are there any workarounds or new packages (lme4a, Bayesian, ...)
> that can do this type of analyses?

Perhaps I misunderstand, but can't one get this model by adding 
appropriate random effects interaction terms?

Cheers, David Duffy.
| David Duffy (MBBS PhD)                                         ,-_|\
| email: davidD at qimr.edu.au  ph: INT+61+7+3362-0217 fax: -0101  /     *
| Epidemiology Unit, Queensland Institute of Medical Research   \_,-._/
| 300 Herston Rd, Brisbane, Queensland 4029, Australia  GPG 4D0B994A v

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