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st: Storing random intercept estimation? (xtmixed?)


From   Christian Weiß <mail@cweiss.org>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Storing random intercept estimation? (xtmixed?)
Date   Thu, 17 Sep 2009 17:02:49 -0400

Dear Statalist,


using a textbook example on birthweight I estimated the following
model: xtmixed birwt ||: momid:, variance
yielding


------------------------------------------------------------------------------
       birwt |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
       _cons |   3467.969   7.138554   485.81   0.000     3453.977     3481.96
------------------------------------------------------------------------------

------------------------------------------------------------------------------
  Random-effects Parameters  |   Estimate   Std. Err.     [95% Conf. Interval]
-----------------------------+------------------------------------------------
momid: Identity              |
                  var(_cons) |     135686   4755.874      126677.6      145335
-----------------------------+------------------------------------------------
               var(Residual) |   142625.4   2965.965      136929.1    148558.7
------------------------------------------------------------------------------
LR test vs. linear regression: chibar2(01) =  1316.12 Prob >= chibar2 = 0.0000

with "di _b[_cons]" I can display (and thus process) the estimated
coefficient of birwt. However, I would like to process the estimated
variance components of the random intercept (i.e. var(_cons) and
var(Residual).

How can adress these values?

Best,
Chris




Viele Grüße
Christian

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