On 15/09/2009, at 9:11 AM, Maria Sagot wrote:
Dear all,
I'm performing poisson regressions using the glm(family=poisson) and
zero-inflated regressions using the zeroinfl from the package pscl.
However
any of those give an R^2 and I was wondering if there is a way to
get it.
R^2 is meaningless for such models. They are fitted via maximum
likelihood, not least squares.
cheers,
Rolf Turner
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