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RE: st: Factor variables and mim


From   "Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Factor variables and mim
Date   Mon, 10 Aug 2009 11:42:52 -0700

This sounds like a nice option.  Does this imply that I can run a
stepwise regression or LARS by using cmdok?

Tony

Peter A. Lachenbruch
Department of Public Health
Oregon State University
Corvallis, OR 97330
Phone: 541-737-3832
FAX: 541-737-4001


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Yulia
Marchenko, StataCorp LP
Sent: Sunday, August 09, 2009 12:14 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Factor variables and mim

Fred Wolfe <fwolfe@arthritis-research.org> pointed out that although -mi
estimate- supports factor variables, it does not support -xtmixed-:

> Yes, -mim- does not accept factor variables - too bad.  and -mi
estimate-
> doesn't work with xtmixed or mfp
> mim works with xtmixed.
> 
> From my perspective, if you want to use multiply imputed data sets and
> -xtmixed-, it appears that -ice- and -mim- are what must be used, but
> without factor variables - something that could be done in Stata 10.1.

Fred is right that -mi estimate- does not yet officially support
-xtmixed-.
However, -mi estimate- provides a way of obtaining results from
virtually any
estimation command via option -cmdok-.  For example, you can type:

. mi estimate, cmdok: xtmixed y x1 i.x2 || group:

to obtain MI results from -xtmixed- with factor variables.


--Yulia
ymarchenko@stata.com
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