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From |
Robert A Yaffee <bob.yaffee@nyu.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: RE: st: Constraints for simultaneous equations model |

Date |
Wed, 16 Apr 2008 21:49:29 -0400 |

Beat, Suppose you have reg3 (y1 y2 x1 x2 x3) (y2 y1 x1 x2 x3) and you want to drop out x1 from the first y1 equation, you could specify this as follows: constraint 1 [x1] y1 = 0 reg3 (y1 y2 x1 x2 x3) (y2 y1 x1 x2 x3) , 3sls constr(1) This sets up the constraint of x1 = 0. Bob Yaffee Robert A. Yaffee, Ph.D. Research Scientist Silver School of Social Work New York University ----- Original Message ----- From: Beat Hintermann <bhintermann@arec.umd.edu> Date: Wednesday, April 16, 2008 9:33 pm Subject: RE: st: Constraints for simultaneous equations model To: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> > I wasn't using anything specific yet, but probably will end up using reg3. > > In any case, I'm aware of the conditions necessary for identification. > My system will end up being over-identified because I have a whole lot > of exclusion restrictions. My problem is how to enter these > restrictions in a reasonably efficient way. My system actually > contains over 300 equations, not the 10 I used in the example, so > typing them in individually is simply unfeasible. > > > ________________________________________ > From: owner-statalist@hsphsun2.harvard.edu > [owner-statalist@hsphsun2.harvard.edu] On Behalf Of Robert A Yaffee [bob.yaffee@nyu.edu] > Sent: Wednesday, April 16, 2008 9:26 PM > To: statalist@hsphsun2.harvard.edu > Subject: Re: st: Constraints for simultaneous equations model > > Beat, > Are you using reg3? You need to check to be sure the rank condition > is satisfied. > Regards, > Bob Yaffee > > > Robert A. Yaffee, Ph.D. > Research Scientist > Silver School of Social Work > New York University > > > ----- Original Message ----- > From: Beat Hintermann <bhintermann@arec.umd.edu> > Date: Wednesday, April 16, 2008 6:22 pm > Subject: st: Constraints for simultaneous equations model > To: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> > > > > I wonder whether there is an efficient way to define constrains for > a > > simultaneous equation model. > > > > For example, assume I have 10 endogenous variables. For identification > > purposes I need to place at least 9*10/2=45 restrictions on the > > parameters. Is there a way to do this in matrix form, as opposed to > > defining 45 individual constraints? > > > > Any help much appreciated > > > > Beat > > > > * > > * For searches and help try: > > * http://www.stata.com/support/faqs/res/findit.html > > * http://www.stata.com/support/statalist/faq > > * http://www.ats.ucla.edu/stat/stata/ > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: RE: st: Constraints for simultaneous equations model***From:*Beat Hintermann <bhintermann@arec.umd.edu>

**References**:**st: Constraints for simultaneous equations model***From:*Beat Hintermann <bhintermann@arec.umd.edu>

**Re: st: Constraints for simultaneous equations model***From:*Robert A Yaffee <bob.yaffee@nyu.edu>

**RE: st: Constraints for simultaneous equations model***From:*Beat Hintermann <bhintermann@arec.umd.edu>

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