[R] statistical prediction for glm()

Thomas W Blackwell tblackw at umich.edu
Mon Nov 24 17:11:31 CET 2003

Martin  -

Do you want a goodness of fit measure for a Poisson glm ?

I would start py plotting the residuals and doing an
analysis of deviance on nested models.  See McCullagh and
Nelder, as well as more recent references.

-  tom blackwell  -  u michigan medical school  -  ann arbor  -

On Fri, 21 Nov 2003, Martin Wegmann wrote:

> Hello,
> possibly it is a stupid question but after few hours of trying and searching,
> perhaps I used the wrong key words, I decided to post it.
> I have the output of a glm() of count data (poisson).
> I would like to get the prediction error (cross-validation).
> cv.glm() does not work with poisson error family data. Or I have to transform
> the output error pred. in some way.
> are there method especially for glm() with different error families to receive
> the model goodness / the model badness?
> thanks in advance, Martin
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