[Limdep Nlogit List] Bivariate Probit Selection for a Tobit model

[William Greene]

Diana.  The bivariate probit selectiion model is only supported 
for the linear model, not the tobit model.  Note, the linear 
model is estimated using two step least squares.  The tobit model
would have to be fit using ML, for a trivariate normal based log
likelihood.  I have never seen it derived.
/Bill Greene

----- Original Message -----
From: "Diana Fletschner" <fletschn at u.washington.edu>
To: "Limdep and Nlogit Mailing List" <limdep at limdep.itls.usyd.edu.au>
Sent: Thursday, August 30, 2007 4:57:34 PM (GMT-0500) America/Bogota
Subject: [Limdep Nlogit List] Bivariate Probit Selection for a Tobit model


Hello--

I am trying to estimate a Tobit model with a Bivariate Probit selection but cannot get the results I am interested in. This is what I have:

Bivariate Probit;
    Lhs = p1, p2;
    rhs = x1;
    rh2 = x2;
    wts = ...;
    hold for SELECT$

Select;
    Lhs = y;
    Rhs = x3, p1, p2;
    wts = ...;
    all;
    tobit$

The output I get is only for the Bivariate Probit and the 2sls of the second regression. I do not obtain the Tobit (corrected) results. Is there a way to obtain these results? I would like to use the entire sample for the Tobit to be able to say something about the parameters associated with p1 and p2.

Any help would be much appreciated!
Diana
_______________________________________________
Limdep site list
Limdep at limdep.itls.usyd.edu.au
http://limdep.itls.usyd.edu.au


-- 
Professor William Greene
Department of Economics
Stern School of Business
New York University
44 West 4th St., Rm. 7-78
New York, NY   10012
http://www.stern.nyu.edu/~wgreene
212.998.0876