Statalist The Stata Listserver


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

st: RE: inequality constraints for regression models


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: inequality constraints for regression models
Date   Thu, 6 Apr 2006 17:51:50 +0200

-constraint- only excepts equality constraints.

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z214 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Stephan Brunow
Sent: donderdag 6 april 2006 14:37
To: statalist@hsphsun2.harvard.edu
Subject: st: inequality constraints for regression models

we want to estimate a regression model (Zellners SUR model) with some
restrictions on parameters and equal explanatory variables. Especially we
want to say that the parameters have to be between 0 and 1.
At the moment we wrote
 
Constraint define 1 [eq1]variable1>=0 & [eq1]variable1<=1
Sureg (yvar1-yvar3 = variable1), cons(1)
 
The error message we get is
 
'not possible with test - r(131)'
 
What did we wrong? Finally, it turns out that the question is: How to write
the constraint?!
 

*
*   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