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st: Question_Heckman-Test_Mills-ratio

From	"朱琦" <[email protected]>
To	"statalist" <[email protected]>
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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