[R] When to use quasipoisson instead of poisson family
ronggui.huang at gmail.com
Tue Apr 10 07:25:55 CEST 2007
It seems that MASS suggest to judge on the basis of
sum(residuals(mode,type="pearson"))/df.residual(mode). My question: Is
there any rule of thumb of the cutpoiont value?
The paper "On the Use of Corrections for Overdispersion" suggests
overdispersion exists if the deviance is at least twice the number of
degrees of freedom.
Are there any further hints? Thanks.
Department of Sociology
Fudan University, Shanghai, China
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