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st: RE: How do I impose the constraint that rho is a given number (eg 0.2) using biprobit?
From
"Martin Weiss" <[email protected]>
To
<[email protected]>
Subject
st: RE: How do I impose the constraint that rho is a given number (eg 0.2) using biprobit?
Date
Sat, 20 Mar 2010 21:40:00 +0100
<>
Transfer the FAQ to your case:
*************
webuse school, clear
constraint define 1 [athrho]_cons=`=.5*log((1+.2)/(1-.2))'
biprobit private vote logptax loginc years, constr(1)
*************
HTH
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Claudia Berg
Sent: Samstag, 20. März 2010 19:57
To: [email protected]
Subject: st: How do I impose the constraint that rho is a given number (eg
0.2) using biprobit?
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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