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| From | Maarten Buis <maartenlbuis@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Nonlinear constraints in -ml- programming |
| Date | Sun, 17 Feb 2013 16:44:33 +0100 |
On Sun, Feb 17, 2013 at 3:06 AM, Muyang Zhang <zmyfudan@gmail.com> wrote: > The FAQ you shared discussed the way to deal with interval > constraints, but my problem is a "proportional constraints" where the > coefficient of the 2nd equation over the coefficient of the 1st > equation is constant for all dummies. The mechanics is the same, and I guessed that that is what your were asking for. Alternatively, you can stack the equations, i,e. turn your dataset in a long dataset, and use -propcnsreg-, which you can get by typing in Stata -ssc install propcnsreg-. -- Maarten --------------------------------- Maarten L. Buis WZB Reichpietschufer 50 10785 Berlin Germany http://www.maartenbuis.nl --------------------------------- * * 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/