Rosario Garcia Gil <M.Rosario.Garcia <at> slu.se> writes:
>
> Hello
>
> I hope my question makes sense. It is possible to specify the shape
paramenters in a glm model with family Gamma?
>
It doesn't look that way, but you can do a Gamma model with
a specified shape parameter (albeit much less efficiently) via
library(bbmle)
mle2(response~dgamma(scale=(1/invmu)/a,shape=a),
parameters=list(invmu~pred1+pred2+...),
start=list(mu=1,shape=0),
data=...)
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