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st: pw in Heckman twostep method


From   <[email protected]>
To   [email protected]
Subject   st: pw in Heckman twostep method
Date   Mon, 14 Apr 2008 12:06:29 -0500 (CDT)

Hi, 

I am sorry to ask you very elementary question, but could anyone tell me why "pw" option is not allowed in "heckman" command with "twostep" option? Thank you very much.
 
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