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Re: st: Inequality constraint with mata -optimize-
From
Richard Williams <[email protected]>
To
[email protected], [email protected]
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: [email protected]
WWW: http://www.nd.edu/~rwilliam
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