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st: simple slopes after xtmixed


From   Jordan Silberman <silberman.stata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: simple slopes after xtmixed
Date   Sun, 17 Jun 2012 13:22:02 -0400

Two questions on computing simple slopes after xtmixed:

1. Some have suggested that, after xtmixed, you can compute simple slopes using either the lincom post-estimation command or the margins post-estimation command. Alternatively, to probe simple slopes for mixed effects models, Preacher created an online calculator tool (http://quantpsy.org/interact/hlm2.htm). Can anyone tell me if the Preacher approach to computing simple slopes for mixed effects models is the same as and/or is comparable to either lincom or the margins command? 

2. Using the lincom and margins commands after xtmixed to compute simple slopes yields different results. Why?

Any guidance would be greatly appreciated.
Jordan
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