topic Re: How to determine the overall model fit for Neg Binomial and Poisson Models? in SAS Enterprise Guide

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

PeterBRZ — Mon, 14 May 2012 18:07:28 GMT

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

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

ChrisHemedinger — Tue, 15 May 2012 13:11:32 GMT

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

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

PeterBRZ — Tue, 15 May 2012 16:42:45 GMT

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

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

ChrisHemedinger — Tue, 15 May 2012 16:52:28 GMT

This is probably a better question for the discussion forum.

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

PeterBRZ — Tue, 15 May 2012 16:58:24 GMT

thanks Chris!