st: -heckman- and the identifying variable(s)

From	Louis Boakye-Yiadom <[email protected]>
To	[email protected]
Subject	st: -heckman- and the identifying variable(s)
Date	Mon, 15 Oct 2007 13:43:28 +0100

When using the -heckman- command, is there a way of checking the validity of the identifying variable(s)? Thanks.

Louis
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Follow-Ups:
- Re: st: -heckman- and the identifying variable(s)
  - From: Maarten buis <[email protected]>