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st: xtmixed and estat vce


From   "VIVIAND Xavier" <xavier.viviand@mail.ap-hm.fr>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: xtmixed and estat vce
Date   Thu, 1 Sep 2005 17:03:18 +0200

Dear Statalist,


I am new to xtmixed and I have some problems with the postestimation
command estat vce. For example:

use pig
xtmixed weight week ||id :
estat vce

Covariance matrix of coefficients of xtmixed model             | weight                 | lns1_1_1   | lnsig_e            e(V) |       week       _cons |      _cons |      _cons -------------+------------------------+------------+------------weight       |                        |            |                    week |  .00152594             |            |                   _cons |  -.0076297   .36377668 |            |            -------------+------------------------+------------+------------lns1_1_1     |                        |            |                   _cons |          0           0 |  .01133685 |            -------------+------------------------+------------+------------lnsig_e      |                        |            |                   _cons |          0           0 |  -.0000421 |  .00130548


I don't understand the meaning of the two last right columns.I didn't find
any explanation into the documentation.
Thank you for your help,

Xavier



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