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st: Explaining Gamma coefficient after bioprobit command


From   "Telli Anvernali Henry" <lexht2@nottingham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Explaining Gamma coefficient after bioprobit command
Date   Thu, 29 Apr 2010 21:29:19 +0100

Dear Statalisters,

I am using the command bioprobit for my bivariate ordered probit
regressions and I wondered if anybody can help me with an explanation
for the estimated gamma beyond just the sign. I know rho measures the
correlation of the error terms while gamma measure the actual
relationship between equation 1 and 2 but apart from the sign of the
gamma coefficient what can I say about the impact of the coefficient
itself and does it matter that gamma and rho have opposite signs? For
instance if gamma is 0.64, what can I say apart from "there is a strong
positive correlation between depvar1 and depvar2".

Thanks,

Henry.

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