Date: Fri, 5 Aug 2005 15:29:59 -0700
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
Subject: help on random / repeated statements in SAS PROC MIXED
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I have a question in specifying correct correlation structure using
random and/or repeated statements in SAS PROC MIXED when analyzing my
The data set consists of multiple measurements during each day on
multiple days (1-21) for each of some number of subjects. I'd like to
assume a random intercept due to subject, and a time series with
respect to day (so that measurements during a day share the same random
day effect) with an AR(1) correlation structure among observations on
different days. I'm not concerned about whether to use random or
repeated statements as long as the correct correlation matrix is
specified. Any hints or thoughts will be greatly appreciated.
MD Anderson Cancer Center
Houston, TX 77030