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How to determine the overall model fit for Neg Binomial and Poisson Models?

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Occasional Contributor
Posts: 9

How to determine the overall model fit for Neg Binomial and Poisson Models?

Hi All,

Can someone explain me how I can determine the overall model fit for a negative binomial and Poisson model?

(I'm not an expert with SAS enterprise guide, so please explain it simple :-) )

I want to know how much of the variance is determined by my estimated models (in order to check if it's a steadfast model

Thanks in advance,

Regards,

Peter

Community Manager
Posts: 2,889

Re: How to determine the overall model fit for Neg Binomial and Poisson Models?

While I cannot offer specific analytical advice (not my background), your request seems to fit the use of PROC GENMOD in SAS.  To find this in SAS Enterprise Guide: Tasks->Regression->Generalized Linear Models. 

That's a place to start.  I don't know if it will take you all of the way to your solution.

Chris

Occasional Contributor
Posts: 9

Re: How to determine the overall model fit for Neg Binomial and Poisson Models?

what I actually mean is;

how much of the variance is determined by the model.. I thought that normally the r² calculated this rate but my NEGBINOM and POISS did not calculate this..

I want to know how much of the variance is determined by my estimated models (in order to check if it's a steadfast model)

can someone help?

thanks

Community Manager
Posts: 2,889

Re: How to determine the overall model fit for Neg Binomial and Poisson Models?

This is probably a better question for the discussion forum.

Occasional Contributor
Posts: 9

Re: How to determine the overall model fit for Neg Binomial and Poisson Models?

thanks Chris!

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