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

[PeterBRZ]

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

[ChrisHemedinger]

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

[PeterBRZ]

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

[ChrisHemedinger]

This is probably a better question for the discussion forum.

[PeterBRZ]

thanks Chris!