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RE: st: xtsur cmd problem with missing values in matrices


From   "Nguyen Cong Minh" <congminh6@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: xtsur cmd problem with missing values in matrices
Date   Thu, 16 Oct 2008 15:04:13 -0400

Christian,

Based on Christian's message
(http://www.stata.com/statalist/archive/2008-10/msg00723.html), it seems
that co-variance matrix of estimated parameters has missing values (.). This
could be the results of too many zero observations or underflow issue (where
the calculated number is very small, smaller than -smallestdouble()- and
Stata assigns it as missing value.

In terms of underflow/overflow issue, I have no idea how to correct these
problems, perhaps some users on the list can help.

Best regards,

Minh Nguyen

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