Date: Tue, 28 Oct 2003 09:06:51 -0600
Reply-To: "Striley, Cathy" <STRILEYC@EPI.WUSTL.EDU>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: "Striley, Cathy" <STRILEYC@EPI.WUSTL.EDU>
Subject: log likelihoods in negative binomial regression
Thanks for all the help I have received before from this list!
I am exploring an anomaly between SAS and STATA output.
I am using PROC GENMOD with these options dist=nb link=log type3 wald.
Comparing this to STATA nbreg, I find that my dispersion parameters are very
close to the same value, my slope coefficients are close but not exact, but
my log likelihoods are very, very different (SAS =-.563.3051; STATA
Does anyone have a possible explanation?
Thank you for any help!
Catherine Woodstock Striley, MSW, LCSW, Ph.D.
NIMH Postdoctoral Fellow
Washington University School of Medicine
Department of Psychiatry
40 N. Kingshighway, Suite 4
St. Louis, MO 63108