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st: -xtmixed- Statistics question about testing differences between groups at specific times


From   "Sun, Wensheng" <wsun@bcm.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: -xtmixed- Statistics question about testing differences between groups at specific times
Date   Tue, 8 Jan 2013 17:16:00 -0600

Hi,

I am using –xtmixed- on a longitudinal study with planned measurements at 0, 6, 12 and 24 months, but very few follow-up measurements at the planned time.  I have fitted the model and need to evaluate changes from baseline and also differences between two treatment groups at exactly 6, 12 and 24 months.  The –xtmixed- followed by –margins- gives margins and standard error at each time.  How do I compare them?  I am using Stata 12 for Windows.  Thanks. 

Carol
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