Date:         Fri, 26 Dec 2008 20:43:30 -0800
Reply-To:     Sassy <AugustinaO@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Sassy <AugustinaO@GMAIL.COM>
Organization: http://groups.google.com
Subject:      Comparison between Observed and Predicted Probability using
              Poisson Regression
Comments: To: sas-l@uga.edu
Content-Type: text/plain; charset=ISO-8859-1

Hey all,

I am doing a analysis were I want to compared the observed number of
hospital visits patients had to the predicted number of hospital
visits they are supposed to have based on the medication they are
taking. we are looking at visits within one year only.  I think this
analysis requires a poisson regression using proc genmod, which I have
not used before.  I also want to control for other factors that might
affect the frequency of visits.  Does anyone have any idea on how to
use poisson regression for this analysis or have experience using
poisson regression?