Hello,
    I would like to ask if it is possible (and if so how) to obtained an estimate of the residual variance of a mixed model having a set of nested random factors when using family=Poisson. I have searched in the help files and in the forum and I found no information in this regard. When using family=Gaussian, one obtains by default this variance but not when using Poisson. In the latest verion of lme4, one can now obtain the residuals of a fitted model when family=Poisson, and one can of course calculated the variance of these residuals. However, not being sure of how these residuals are calculated (are they standardised?, raw?, etc), I am unsure of using their variance as an estimate of the residual variance in a nested mixed model.
Many thanks in advance,
Regards,
Pablo



      _____________________________________________________________________________ 

o.fr
	[[alternative HTML version deleted]]


