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st: biprobit model

From   "Alfredo Paloyo" <>
To   <>
Subject   st: biprobit model
Date   Fri, 4 Feb 2005 09:08:36 +0800

Dear all,

Is it valid to run -biprobit- on a model described by the following:

y = f(x, a)
x = f(y, a, w)

In other words, the dependent variable of the first equation is among
the independent variables of the second equation, and vice-versa.

The results of the command gives exactly the same P>|z|'s for the common
arguments (i.e., a), with the coefficients having simply the opposite
signs (i.e., same absolute value).  Variables x and y have exactly the
same coefficient and P>|z|.  Standard errors are the same everywhere.

Much thanks.


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