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Re: st: variance components are not shown using xtmixed

From (Roberto G. Gutierrez, StataCorp)
Subject   Re: st: variance components are not shown using xtmixed
Date   Mon, 16 Apr 2007 13:51:28 -0500

Tsui-o Tai <> writes:

> I used xtmixed to run random-tntecept models. Somehow I could not get the
> variance components. The results indicated that "dzeros () not allowed" and
> "option notab not allowed". My results are shown in the following. Could
> anyone help me delect the problem?  Thank you very much for your help.

These error messages seem to indicate that your Stata 9 ado files have 
been corrupted or otherwise comprimised by some pre-Stata 9 versions of 
these files.  These error messages point out that you are getting pre-Stata
9 behavior for the commands -_diparm- and -ml model-, whereas -xtmixed- is 
relying on Stata 9 behavior.  

Another possibility is that you have altered your adopath so that the
pre-Stata 9 files are taking precedence where they should not be.

You should also make sure that your ado-files and executable are in sync.
Type -update query- and follow the instructions.

If after checking for the above, the problem persists, please write in to 
tech support at 

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