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Re: st: xtmixed: cov structure for within REs


From   Raphael Fraser <raphael.fraser@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xtmixed: cov structure for within REs
Date   Tue, 10 Feb 2009 13:03:13 -0500

Perhaps if you provide the SAS code we could translate into Stata.

On Mon, Feb 9, 2009 at 2:32 PM, SR Millis <srmillis@yahoo.com> wrote:
> In xtmixed, is it possible to model the covariance structure for the within-individual random errors (R matrix), ie, an xtmixed equivalent of the "repeated" statement in SAS?
>
> Of course, using "random" and "repeated" statements in SAS likely over-specifies the model--and non-convergence often occurs.
>
> Thanks,
> Scott
>
>
>
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-- 
Raphael A. Fraser, MSc
Lecturer in Biostatistics
Tropical Medicine Research Institute
Faculty of Medical Sciences
University of the West Indies
Mona Campus
Kingston, JAMAICA

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