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Date:         Thu, 9 Nov 2000 08:42:24 -0500
Reply-To:     John Jones <jonesj@PHARMARESEARCH.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         John Jones <jonesj@PHARMARESEARCH.COM>
Subject:      Re: PHREG and dummy variables
Comments: To: Luca Boni <boni@CBA.UNIGE.IT>
In-Reply-To:  <3.0.6.32.20001109122717.00909480@ermes.cba.unige.it>
Content-Type: text/plain; charset="us-ascii"; format=flowed

Hi Luca,

There does not appear to be a CLASS statement for PHREG. You'll need to create indicator variables in a data step. Pick a reference treatment and omit its respective variable from the PHREG model.

Data Shmata; set MyTreatment; TrT1=0; TrT2=0; TrT3=0; if (TrT='PLACEBO') then TrT1=1; else if (TrT='LOW') then TrT2=1; else if (TrT='HIGH') then TrT3=1; run;

Proc PHReg data=Shmata; model response = TrT2 TrT3; run;

At 12:27 PM 11/9/00 +0100, Luca Boni wrote: >Hi all: > >Question about SAS V8... > >Is there any statement (such as CLASS in the PROC GLM) to define a >classification variable inside the PROC PHREG ? (i.e. the treatment >variable has three levels and I would like to apply a stepwise selection >method) > >Thanks > >Luca > > > > > \\\|/// > \\ - - // > ( @ @ ) >----o00o-(_)-o00o---------------------------------------------------- > >Luca Boni, MD >Unit of Clinical Epidemiology and Trials >Advanced Biotechnology Center-National Institute for Cancer Research >GENOVA-ITALY >Tel.: +39 010 5737477 >Cellular Phone: +39 335 6777997 >E-mail: boni@cba.unige.it


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