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| From | Annie Zhang <annieclairezhang@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: Heckman Procedure |
| Date | Tue, 11 Jun 2013 14:05:45 +1200 |
Hi there, When using the heckman procedure I want to use the independent variable in the first stage as well as make it a dependent variable in the selection model, however stata will drop the variable due to collinearity each time. How can I use the heckman procedure in this case? My model is heckman cash fa age sex logfum, select(fa=age sex logfum) twostep And the 'fa' variable keeps dropping. Thanks for your help! Kind Regards, Annie * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/