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st: Heckman Selection Rule


From   mtavoni <mtavoni@Princeton.EDU>
To   statalist@hsphsun2.harvard.edu
Subject   st: Heckman Selection Rule
Date   Mon, 24 Aug 2009 18:08:13 -0400

Dear all,

a quick question on sample selection estimation. In Heckman, STATA estimates the parameters in the model:

       (regression equation: y is depvar, x is varlist)
       y = xb + u_1

       (selection equation: Z is varlist_s)
       y observed if Zg + u_2 > 0


What if I want to change the rule for the selection equation to something like:
 y observed if Zg + u_2 < Constant


thanks for helping out.

cheers
max

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