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From |
"Jun Xu" <mystata@hotmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
RE: st: Constraining alpha and theta in slogit |

Date |
Mon, 14 Nov 2005 19:57:31 -0600 |

Dear Mike,

For setting the first constraint, it's like

constrain def 1 [phi1_1]_cons+[phi1_2]_cons+[phi1_3]_cons+...+[phi1_j]_cons=0

and it should work well, but I do find problems with your magnitude constraints. I only have limited working knowledge with slogit, so others or Stata staff might have some suggestions. But I guess one possibility why this does not work is probably slogit in Stata has used the first strategy (impose the first phi to be 1 and last to be zero) that DiPrete's paper mentioned just above the discussion on Goodman's strategy (P.761), and that might cause Goodman's strategy hard to implement?

P.S.: we are always proud of our distinguished member!

Jun Xu

Ph.D. Candidate

Department of Sociology

Indiana University at Bloomington

_________________________________________________________________From: Michael Hout <mikehout@berkeley.edu> Reply-To: statalist@hsphsun2.harvard.edu To: statalist@hsphsun2.harvard.edu Subject: RE: st: Constraining alpha and theta in slogit Date: Mon, 14 Nov 2005 15:54:54 -0800 Dear Jun, How about the constraint the DiPrete (1990) uses: Sum_j phi_j = 0 Sum_j phi_j^2 = 1 I have not been able to figure that out. -Mike PS Warm greetings to my friends and your mentors in Bloomington! * * 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/

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* 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/

**References**:**RE: st: Constraining alpha and theta in slogit***From:*Michael Hout <mikehout@berkeley.edu>

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