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Re: st: Inequality constraints in single and multi-equation models


From   "Michael Blasnik" <michael.blasnik@verizon.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Inequality constraints in single and multi-equation models
Date   Sat, 24 Dec 2005 09:15:14 -0500

Actually, this advice is incorrect. Stata only allows equality constraints. A quick look at -help constraint- or a google of "Stata inequality constraints" would have led either poster to that answer.

Michael Blasnik
michael.blasnik@verizon.net

----- Original Message ----- From: "Rose Medeiros" <rosem@cisunix.unh.edu>
To: <statalist@hsphsun2.harvard.edu>
Sent: Saturday, December 24, 2005 8:57 AM
Subject: Re: st: Inequality constraints in single and multi-equation models



Michael.
In general, Stata does not accept the form "0 < lnpl < 1" I believe you are getting the error message "0 not found" because Stata does not expect a numeric value in that position. Instead you probably want something of the form:
define constraint 7 lnpl < 0 & lnpl < 1
or
define constraint 7 lnpl < 0
define constraint 8 lnpl < 1
HTH,
Rose
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