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st: RE: xtmixed


From   "Hoffman, George" <ghoffman@mcw.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: xtmixed
Date   Tue, 14 Feb 2012 10:16:38 -0600

Have you xtset your dataset?
What about xtsum, to get within- and between-subject variance components?
George Hoffman

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Erik Carter
Sent: Monday, February 13, 2012 10:01 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: xtmixed

Hello,

I am attempting to do a icc using the quickicc command following the use of xtmixed. I'm attempting to check repeatability in a sample of 24 individuals with QT measures (a measure of ventricular depolarization).  Each individual has various readings of QT; some have 31 whilst others have 5.  My question: is it possible to do an analysis using the xtmixed command when obs vary in numbers?   Furthermore, I'm unclear if I am using the commands properly as when I use the command xtmixed qt || study_id: I get a iteration string that goes on endlessly. 

Any assistance would be appreciated.

Best,

Erik


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