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Re: st: Interpreting random effect variance using GLLAMM versus GLLAPRED


From   Maarten buis <[email protected]>
To   [email protected]
Subject   Re: st: Interpreting random effect variance using GLLAMM versus GLLAPRED
Date   Sun, 2 Jan 2011 16:59:39 +0000 (GMT)

--- On Sun, 2/1/11, Denise Duffy wrote:
> I'm using GLLAMM to estimate an item response type model
> with individual random effects and am having trouble
> interpreting the random effect variance reported by GLLAMM.
<snip>
> I then estimated the individual random effects using
> gllapred (gllapred u, u).  The variance of the mean
> estimate does not equal the GLLAMM-reported variance
> (.33895169).  I would expect these to be equivalent.

There was quite a detailed discussion on this recently on 
the statalist. That thread starts here:
<http://www.stata.com/statalist/archive/2010-12/msg00750.html>

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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