RE: st: Constraining alpha and theta in slogit

["Jun Xu" <mystata@hotmail.com>]

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!
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