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st: Using the maximum likelihood heckman - in the presence of missing variables
From
"georg wernicke" <[email protected]>
To
[email protected]
Subject
st: Using the maximum likelihood heckman - in the presence of missing variables
Date
Wed, 8 Aug 2007 13:00:54 +0100
Hello,
I tried to use the maximum likelihood heckman and got the error term
r(504) saying that the hessian matrix has become unstable. most likely
that error term evolved since i, for some years, miss some independent
variables.
Do i have to use the heckman two step instead?
Thank you very much,
regards
georg wernicke
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