Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: constraints


From   "Joseph Coveney" <jcoveney@bigplanet.com>
To   "Statalist" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: constraints
Date   Wed, 25 Jun 2008 21:00:36 +0900

Chiara Mussida wrote:

yes, but it is related to the same eq specified w r to 2 different cons.
In a mvprobit I have 6 different equations with 6 different constraints:
mvprobit (private = years logptax loginc) (vote = years logptax
           loginc) (pub12 = years loginc):
how could I add different cons to each eq??

--------------------------------------------------------------------------------

It would be like the following:

use http://www.stata-press.com/data/r7/school.dta, clear
constraint define 1 [private]loginc = 0.4
constraint define 2 [vote]loginc = 0.6
mvprobit (private = years logptax loginc) ///
(vote = years logptax loginc, nocons), constraints(1 2)
exit

If I copied the -mvprobit- command from your last post correctly, it looks
as if you've got two equations (UE and UN) represented thrice each in your
model:

mvprobit(UE=sex age xfamsize loweduc compulsory diploma ///
 urate experience north centre southislands, constraints(1)) ///
 (UN=sex age married xfamsize loweduc compulsory diploma experience) ///
 (UE=sex age newdiploma urate experience) ///
 (UN=sex age famsize loweduc compulsory diploma experience) ///
 (UE=sex married loweduc compulsory diploma experience) ///
 (UN=sex age married nodiploma experience), cons(1-3)

I'm surprised that you hadn't got an error message like

Equation/parameter /private/ multiply defined
r(110);

in a pilot run prior to attempting applying constraints.

Joseph Coveney


*
*   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/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index