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Re: st: Are my -xtmixed- intercepts accurate?

From   "Clyde Schechter" <>
Subject   Re: st: Are my -xtmixed- intercepts accurate?
Date   Sat, 21 Aug 2010 16:21:39 -0700


One side comment unrelated to the interpretation of the residuals.

If I understood the original post correctly, you want to contrast the
change over time between treatment groups.  In that case, your model
should have a time X tx interaction term among the fixed effects.  So,
assuming time is a discrete variable in your situation, I think it should
look like:

xtmixed avg i.time##i.tx || ...

Clyde Schechter, MA MD
Associate Professor of Family & Social Medicine

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