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st: simultaneous probit with two binary variables

From   Q Cher Li <>
To   "''" <>
Subject   st: simultaneous probit with two binary variables
Date   Mon, 9 Jan 2006 12:32:53 -0000

Dear Statalisters,

I've been trying to estimate the following simultaneous probit models:

(1) Y1=a*Y2 + b*X1 + e1;
(2) Y2=c*Y1 + d*X2 + e2.

where Y1 and Y2 are two endogenous binary variables; X1, and X2 are two sets
of exogenous variables of Y1 and Y2 respectively; e1 and e2 error terms.
That is to say, Y1 and Y2 suspected to be endogenously determined by each

I am thinking of implementing the two-stage method discussed in Maddala
(1983) P246-247 (Model 6. y1 and y2 both binary); but am having problems
calculating the adjusted standard errors of the second-stage models. 

I understand there's a procedure 'cdsimeq' by Keshk that implements
Maddala's approach when one dependent variable is binary, but the other one
CONTINUOUS. Could someone kindly point out whether there is also a similar
Stata/user-written programme that deals with the case of two binary

I've searched through the Statalist archive, but couldn't find any relevant

Your kind help will be greatly appreciated!

Best wishes,

Q. Cher Li
Department of Economics
Adam Smith Building
University of Glasgow
Glasgow G12 8RT, UK
Tel: +44 (0)141 330 2220
Fax: +44 (0)141 330 1880

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