Why don't you use the heckman command which takes care of the selection and correct the standard error in your second step equation?
Arnaud
-----Original Message-----
From: Mary Silles [mailto:[email protected]]
Sent: Mon 10/06/2002 14:58
To: Stata List
Cc:
Subject: st: Date: Mon, 10 Jun 2002 14:58:06 +0100
I have generated a selection term in stata to correct for
schooling sample selection in earnings regressions. As the inverse mills
ratio is a generated regressor, I would be most grateful if you would show
me how to correct the standard errors
to take account of this.
Mary
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