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Re: st: Re: Logit with constraints and no constant


From   "Rodrigo A. Alfaro" <ralfaro76@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Re: Logit with constraints and no constant
Date   Tue, 26 Sep 2006 11:16:43 -0400

Thanks!
R.
----- Original Message ----- 
From: "Ulrich Kohler" <kohler@wz-berlin.de>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, September 26, 2006 10:45 AM
Subject: Re: st: Re: Logit with constraints and no constant


Rodrigo A. Alfaro wrote:
> Also, I could not add constraint to -mlogit-. The following
> is the result using auto dataset:
>
>  sysuse auto
> (1978 Automobile Data)
>
>  constraint define 1 _cons = 0
>
>  mlogit  foreign mpg weight, const(1)

There is a constant in each equation. You need to tell Stata, which of the 
constants you want to constrain. Here are just two examples:

 constraint 1 [1]_cons = 0
 mlogit rep78 mpg, const(1)

 constraint 2 [Foreign]_cons = 0
 mlogit for mpg, const(2)

(the second example gives the error message -redundant or inconsistent 
constraints-, but that was not the question here.)

-help constraint- provides other examples.


Uli
-- 
kohler@wz-berlin.de
+49 (030) 25491-361
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