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Date:   Tue, 6 May 2008 10:13:16 -0700
Reply-To:   Amy Smith <asmith197401@YAHOO.COM>
Sender:   "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:   Amy Smith <asmith197401@YAHOO.COM>
Subject:   Re: Is it true that a zero-inflated Gamma model is not possible in either GENMOD or NLMIXED?
Content-Type:   text/plain; charset=iso-8859-1

I'm now going to offer a $15 gift card for Amazon.com to the first person that can give me functional NLMixed or GENMOD code that allows me to do the two part model that I am trying to do here.  I'm looking for one p-value here.  Yes, I'm officially that frustrated with NLMixed.  My gift card offer expires at 5PM Eastern time on May 7, 2008. A ----- Forwarded Message ---- From: Amy Smith <asmith197401@yahoo.com> To: SAS-L@LISTSERV.UGA.EDU Sent: Monday, May 5, 2008 5:52:43 PM Subject: Is it true that a zero-inflated Gamma model is not possible in either GENMOD or NLMIXED? Has anyone found a procedure in SAS for creating a zero-inflated Gamma model?  My response variable is cost.  I have a class variable called group that has three levels Intervention1, Intervention2, and Control.    The following two models succeed without any problem. PROC GENMOD;   CLASS group;   MODEL cost = group / LINK=log DIST = bin;   PROC GENMOD;   CLASS group;   MODEL cost = group / LINK=log DIST = gamma;   I cannot figure out how to get GENMOD to join these to give a zero-inflated gamma model.  Or I thought maybe NLMixed could handle this model but I cannot get the syntax to work right and I'm now questioning if it is even possible.  Has anyone ever written SAS code that successfully runs on a zero-inflated gamma?  I would really love to see the syntax on a simple example like I have here.   Thanks for your help!    ________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ


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