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st: test for rho=0 in Heckman two-step procedure?


From   Michael Boehm <michael.boehm1@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: test for rho=0 in Heckman two-step procedure?
Date   Wed, 17 Feb 2010 20:18:59 +0000

Dear all,

when I run the "heckman depvar [indepvars], select(varlist_s) twostep"
command I do not get a test for rho=0 (no correlation between errors
in the selection and the main equation) - contrary to the ML version
without the [twostep] option. I also do not find an option that
provides this test and couldn't find anything on a google search.

Can someone help?

Michael
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