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Re: st: Inequality constraint with mata -optimize-

From   Richard Williams <>
Subject   Re: st: Inequality constraint with mata -optimize-
Date   Sun, 29 May 2011 19:21:30 -0500

At 06:09 PM 5/29/2011, Dorothy Bridges wrote:
Thanks, Stas.  I am using ML to estimate a disequilibrium model, in
which the likelihood function is set up as in Maddala and Nelson,
"Maximum Likelihood Methods for Models of Markets in Disequilibrium,"
Econometrica, 1974.  I simply want to constrain two of the parameters
-- variances of the error terms in the demand and supply equations --
to be greater than or equal to zero.

Often this is done by estimating the log of the parameter. See, for example, Stata's -hetprob- program.

Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu

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