Dispersion parameter calculation for Poisson glmer
<juwb08 at ...> writes:
Hi All, I would like to calculate a dispersion parameter for a glmer with a Poisson family (in lme4). I found a function posted on this mailing list that had been suggested to use for calculating a dispersion parameter for a glmer with a binomial family. (Found on https://stat.ethz.ch/pipermail/r-sig-mixed-models/2011q1/015383.html )
[snip] Please see slightly more robust code at http://glmm.wikidot.com/faq#overdispersion_est It should be applicable to GLMMs generally, although please note all the boldface warnings about this being a crude approximation of the overdispersion parameter.