Date: Tue, 28 Jul 2009 09:07:53 -0700
Reply-To: elodie <elodie.gillain@GMAIL.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: elodie <elodie.gillain@GMAIL.COM>
Subject: sample size question when using proc mixed
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I am running a (longitudinal) proc mixed analysis. The table below
gives the sample size at each timepoint from time=0 through time=4.
The output of proc mixed says there are 51 subjects in the analysis,
with a max of 5 observations per subject. The output also says Number
of Observations Read is 205, and the Number of Observations Used is
I am not sure how there can be 51 subjects used for this analysis. I
am guessing that it is OK for a subject to have data at time 0, but
not at time 3 for example. Am I right?
I greatly appreciate your help.