[R] Overdispersion in the lmer models

David Winsemius dwinsemius at comcast.net
Mon Oct 13 03:42:00 CEST 2008

Have you considered  using glm() with  family = "quasipoisson" or  
family = quasibinomial ? I know from experience that the quasipoisson  
choice reports an index of dispersion.


David Winsemius

On Oct 12, 2008, at 4:55 AM, Fucikova, Eva wrote:

> Dear All,
> I am working with linear mixed-effects models using the lme4 package  
> in R. I created a model using the lmer function including some main  
> effects, a three-way interaction and a random effect.
> Because I work with a binomial and poisson distribution, I want to  
> know whether there is overdispersion in my data or not. Does anybody  
> know how I can retrieve this information from R?
> Thank you in advance,
> Eva Fucikova
> 	[[alternative HTML version deleted]]
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