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2012 Mar 14
1
Glm and user defined variance functions
Hi,
I am trying to run a generalized linear regression using a negative binomial
error distribution. However, I want to use an overdispersion parameter that
varies (dependent on the length of a stretch of road) so glm.nb will not do.
>From what I've read I should be able to do this using GLM by specifying my
own quasi family and describing the variance function using varfun, validmu,