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Re: st: Multiple group latent growth models with xtmixed


From   Stas Kolenikov <skolenik@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Multiple group latent growth models with xtmixed
Date   Tue, 24 Nov 2009 14:16:16 -0600

On Tue, Nov 24, 2009 at 2:08 PM, Roberto G. Gutierrez, StataCorp
<rgutierrez@stata.com> wrote:

> Such a covariance is, of course,
> unidentified because a child cannot be both male and female within the course
> of this study.

... and that explains missing standard errors in -xtmixed- output, as
well as correlations of exactly 1 in -gllamm- output.

I wonder what Mplus does there. They probably just set it to zero,
that may be the most sensible thing to do.

-- 
Stas Kolenikov, also found at http://stas.kolenikov.name
Small print: I use this email account for mailing lists only.
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