Date: Sun, 16 Mar 2008 21:36:24 -0700
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
Subject: Are there any tricks through which PROC GENMOD of SAS can be used
to deal with nested correlation for GEEs approach?
Content-Type: text/plain; charset=ISO-8859-1
Can anyone help me on this problem?
Setting: Outcome: Hearing loss (0: no hearing loss; 1: hearing loss).
The study includes about 2000 families (every family has one
FAMILY_ID ). Every family includes 1 mom and/or 1 dad, 0-6 offspring.
The mom/dad was repeatedly measured 3 times (in 1994, 1999, and 2004),
while the offspring were only measured once in 2007. Every participant
has one uniform SUBJECT_ID.
Question: How should I deal with the nested correlation issue?
Originally I had thought to use:
CLASS FAMILY_ID SUBJECT_ID;
MODEL <outcome variable> = <predictors> / DIST = BIN;
REPEATED SUBJECT = SUBJECT_ID (FAMILY_ID) / TYPE = UNSTR;
But I was told that this was incorrect.
Thanks a lot.