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st: Heckman Procedure
From
Annie Zhang <[email protected]>
To
[email protected]
Subject
st: Heckman Procedure
Date
Tue, 11 Jun 2013 14:05:45 +1200
Hi there,
When using the heckman procedure I want to use the independent
variable in the first stage as well as make it a dependent variable in
the selection model, however stata will drop the variable due to
collinearity each time.
How can I use the heckman procedure in this case?
My model is
heckman cash fa age sex logfum, select(fa=age sex logfum) twostep
And the 'fa' variable keeps dropping.
Thanks for your help!
Kind Regards,
Annie
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