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st: xtmixed with repeated measurements at each time point


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: xtmixed with repeated measurements at each time point
Date   Thu, 26 Jan 2012 15:07:40 -0800 (PST)

Hello,

I have longitudinal data where each patient is tested with two different methods at 4 discrete time points. We are interested in testing whether the two methods differ (compare means). Because the observations are conditionally independent at each time point, I used a pair t-test to test means at each time point. However, that approach ignores the longitudinal nature of the data, so I was wandering how I can use -xtmixed- to compare the two methods while taking into account that each patient is tested twice, once with each method, at each time point.

Thank you,
Ricardo. 


Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK
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