[R-sig-ME] correlation structure with glmer?
alice at blarg.net
Wed Nov 25 22:47:35 CET 2009
Very good point, and it makes me wonder why and how other methods (like
Thanks so much for your response and all your work in R!
----- Original Message -----
From: "Douglas Bates" <bates at stat.wisc.edu>
To: "Alice Shelly" <alice at blarg.net>
Cc: <r-sig-mixed-models at r-project.org>
Sent: Monday, November 23, 2009 2:08 PM
Subject: Re: [R-sig-ME] correlation structure with glmer?
> On Mon, Nov 23, 2009 at 1:32 PM, Alice Shelly <alice at blarg.net> wrote:
>> Is there any way to introduce correlation structure into a glmer model?
>> I tried using
>> correlation = corAR1(form= ~age|plot)
>> as you would in lme, but I was ignored (so rude).
> Well, first you would need to decide how to define such a model. It
> is not trivial. For a linear mixed-effects model you can separately
> modify the specification of the mean and the variance of the
> conditional distribution of the response given the random effects.
> For common generalized linear mixed models (family = binomial or
> family = poisson) you can't. Once you have the conditional
> independence assumption and you specify the conditional mean you have
> completely specified the conditional distribution.
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