[R] overdispersion

Peter Dalgaard p.dalgaard at biostat.ku.dk
Thu Jan 11 19:04:26 CET 2007

evaiannario wrote:
> How can I eliminate the overdispersion for binary data apart the use of the quasibinomial?
There is no such thing as overdispersion for binary data. (The variance 
of a two-point distribution is a known function of the mean.) If what 
you want to do is include random effects of some sort of grouping then 
you might look into generalized linear mixed models via lmer() from the 
lme4 package or glmmPQL from MASS.

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