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re: st: xtmixed VS xtgee


From   David Airey <david.airey@vanderbilt.edu>
To   statalist@hsphsun2.harvard.edu
Subject   re: st: xtmixed VS xtgee
Date   Tue, 19 Sep 2006 22:21:56 -0500

I want to know the relationship and differences between them?
and how about Proc mixed and xtmixed in Stata.
Many thanks.

You can do more with Proc Mixed than with xtmixed. xtmixed is essentially version 1.0, whereas Proc Mixed has been through much more development. So if you expect to find yourself doing a lot of mixed models with some variety of design, Proc Mixed is something to consider. For xtmixed and xtgee, xtgee is not a multilevel command like xtmixed (the multilevel syntax of xtmixed is something Stata is rightly proud of). However if you've just got one nested level, xtgee is fine and allows for modeling both continuous and categorical dependent variables, which xtmixed does not.

-Dave
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