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st: difference between -heckman- and -treatreg-

From   Shehzad Ali <[email protected]>
To   [email protected]
Subject   st: difference between -heckman- and -treatreg-
Date   31 Aug 2008 16:41:35 +0100


I was wondering if someone can explain the difference between how -heckman- and -treatreg are estimated. I understand that analysts usually prefer -heckman- for sample selection bias and -treatreg- for endogeneity bias. But I was not sure how the two models are different computationally because they both use hazard ratio (or inverse Mills). Is hazard ratio different from IMR? Can anyone direct me to an article that explains the computational and theoretical difference between the two models?

Thank you,

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