[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: Heckman Selection Rule

From   mtavoni <mtavoni@Princeton.EDU>
Subject   st: Heckman Selection Rule
Date   Mon, 24 Aug 2009 18:08:13 -0400

Dear all,

a quick question on sample selection estimation. In Heckman, STATA estimates the parameters in the model:

       (regression equation: y is depvar, x is varlist)
       y = xb + u_1

       (selection equation: Z is varlist_s)
       y observed if Zg + u_2 > 0

What if I want to change the rule for the selection equation to something like:
 y observed if Zg + u_2 < Constant

thanks for helping out.


*   For searches and help try:

© Copyright 1996–2017 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index