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st: pkcross vs. proc mixed


From   SR Millis <srmillis@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: pkcross vs. proc mixed
Date   Sat, 2 Apr 2005 14:41:11 -0800 (PST)

I've been using SAS proc mixed to analyze AB/AB
cross-over designs (both mixed and fixed effects
models). Out of curiosity, I compared results with
Stata's pkcross--using the Chow & Liu data (used in
the Reference manual example).

I'm getting very different results in SAS vs Stata,
eg, SAS is finding a significant treatment effect
while Stata isn't. What could be accounting for the
differences?

Thanks,
SR Millis



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