Hello,
I am currently working with the betareg package, which allows the fitting of a
variable dispersion beta regression model (Simas et al. 2010, Computational
Statistics & Data Analysis). I was wondering whether there is any package in R
that allows me to fit variable dispersion parameters in the standard logistic
regression model, that is to make the dispersion parameter contingent upon some
covariates. I know that glm() from the base package allows the fitting of a
common dispersion parameter via selection of the quasibinomial family, but
glm() seems not to be able to individualize the dispersion parameter. Every
hint is welcomed!
Chris
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