[R] glm and overdispersion

Hardouin Loïc hardouin at cebc.cnrs.fr
Tue Feb 18 12:09:02 CET 2003


I am performing glm with binomial family and my data show slight
overdispersion (HF<1.5). Nevertheless, in order to take into account for
this heterogeneity though weak, I use F-test rather than Chi-square
(Krackow & Tkadlec, 2001). But surprisingly, outputs of this two tests
are exactly similar. What is the reason and how can I scale the output
by overdispersion ??

Thank you,

Alexandre MILLON
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