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st: Unknown number in constraints


From   jjc.li@utoronto.ca
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Unknown number in constraints
Date   Tue, 10 Mar 2009 01:17:06 -0400

Dear Statalist,

I have to regress the translog cost function with parametric restrictions. One of the restrictions is

a11= -d11^2+a1-a1^2
a12= -d11d21-a2a1
.................
a33= -d31^2-d32^2-d33^2+a3-a3^2

a11 to a33 are all parameters appeared in the cost function and other constraints, but d11 to d33 are all unknown numbers. So how to define the constrain above in stata?

Thank you.

Jingjing Li
University of Toronto

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