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st: Question_Heckman-Test_Mills-ratio

From   "朱琦" <>
To   "statalist" <>
Subject   st: Question_Heckman-Test_Mills-ratio
Date   Wed, 6 May 2009 23:44:13 +0800

Dear STATA List!

It seemed that Mills ratio is based on the first probit regression instead the first and second stage of the model. 
Then what is the function of heckman two step here? 
Thank you!

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