Date:         Wed, 12 Oct 2011 09:56:13 -0400
Reply-To:     sm dong <sasdong18@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         sm dong <sasdong18@GMAIL.COM>
Subject:      question about contrast statement in proc logistic
Content-Type: text/plain; charset=ISO-8859-1

Hi:

I want to build a contrast statement in Proc Logistic. caseGrp has 3 levels,
age_in_months has 6 levels, MedEnroll has 2 levels. I want to compare the
caseGrp Level 1 vs. Level 3 within Age Level 1. But I don't know whether
caseGrp*MedEnroll should also be added in the contrast statement. If I need
to, how may I do that?

*

proc* *logistic* data=FinalData descending;

class casegrp (ref=last) MedEnroll(ref=first) sex_cd(ref=first) MSA

age_in_month(ref=first)/order=internal param=glm;

model H1N1BFFeb_fl = caseGrp MedEnroll age_in_month sex_cd MSA

caseGrp*age_in_month caseGrp*MedEnroll;

contrast 'caseGrp1 vs. caseGrp2 within Age1' caseGrp 1 -1 0

                          caseGrp*Age_in_months 1 0 0 0 0 0

                                               -1 0 0 0 0 0

                                                0 0 0 0 0 0/estimate=exp;

run;