Hi Pooja, I think you refer to the Heckman model (or Heckit) as described in http://en.wikipedia.org/wiki/Heckman_correction I've estimated that type of model using this SAS code: http://www.listserv.uga.edu/cgi-bin/wa?A2=ind0204b&L=sas-l&P=39988 You might also want to look at http://www.listserv.uga.edu/cgi-bin/wa?A2=ind0409c&L=sas-l&P=47590 Let me know if this helps! Chiel
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