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st: heckman 2-step parameter stability

From   "Fabio Soares" <>
Subject   st: heckman 2-step parameter stability
Date   Wed, 23 Jul 2003 18:11:33 +0000

Dear statalisters,

I want to test the stability the parameters of a wage equation corrected for selectivity bias (using heckman 2-step) to changes in the exclusion restrictions of the first step. Does anyone know how to implement a minimum distance test of the stability of the parameters using stata?

Thank you,


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