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


From   Louis Boakye-Yiadom <L.Boakye-Yiadom@bath.ac.uk>
To   statalist@hsphsun2.harvard.edu
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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