You should use offset(log(Gpc)) instead of offset(Gpc)
> options(width = 65)
> fm <- glm(NPe ~ 1 + offset(log(GPc)), family = poisson,data = tab)
> fitted(fm)
1234678
3.181818 3.818182 3.818182 4.454545 3.181818 3.818182 3.181818
9
Not sure that the list is the best place for this question, but we are
going mad with this... We are trying to fit a poisson regression to
count data, eg the number of fledged youngs of blue tits (NPe) as a
function of the clutch size (GPc) and other environment variables. Here
are the original
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