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st: How do I impose the constraint that rho is a given number (eg 0.2) using biprobit?


From   Claudia Berg <cberg@gwmail.gwu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: How do I impose the constraint that rho is a given number (eg 0.2) using biprobit?
Date   Sat, 20 Mar 2010 14:57:07 -0400

Hi,

I'm a newcomer to statalist and hoped you could help me.  I'm trying
to run a biprobit model with the constraint that rho (the correlation
between the errors of the two equations) is fixed at a given value,
say 0.2.  I found instructions online how to set rho to zero using
heckman (see http://www.stata.com/support/faqs/stat/constraints.html)
but am unclear how to modify it to fix rho at another value.

Thank you!

Claudia
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