Date:         Mon, 16 Jul 2007 17:05:37 -0400
Reply-To:     Peter Flom <peterflomconsulting@mindspring.com>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Peter Flom <peterflomconsulting@MINDSPRING.COM>
Subject:      Re: question about stepwise in poisson regression
Comments: To: jn mao <jn_mao@YAHOO.COM>
Content-Type: text/plain; charset=UTF-8

>Hello SAS-Ls,
>
>  I have 11 covariates in a possion model. Could someone give me some advise on STEPWISE selection? Seems SPTEWISE selection can't be used in poisson model. How should I find the final model? Thanks much.
>
>  Jane
>
>

First advice: Don't use stepwise.
David Cassell and I are working on a paper (accepted at NESUG, already given at NYASUG) entitled: Stopping Stepwise.

You can read it here:

http://www.sascommunity.org/wiki/Image:NYASUG-2007-June-Flom-Stopping_stepwise.pdf

Now, if you tell us more about what your data are like, what N is, what your DV is, what you're trying to find out, and so on, then we can provide advice.  Please write to SAS-L, not just to me.

Peter