[Limdep Nlogit List] double hurdle models
William Greene
wgreene at stern.nyu.edu
Thu May 20 02:11:14 EST 2010
Brett
If you want to fit a double hurdle model with rho = 0, you can
just fit the two equations separately: a probit model and a truncated
regression or truncated poisson. I don't see what SELECT has to do
with this, however. SELECT, by construction, with RHO = 0 is just a
linear regression. That is why SELECT won't let you set RHO=0. IF
RHO=0, you have to use a different routine (REGRESS or TOBIT).
/Bill Greene
----- Original Message -----
From: "Brett Smith" <Brett.Smith at uwa.edu.au>
To: "Limdep and Nlogit Mailing List" <limdep at limdep.itls.usyd.edu.au>
Sent: Tuesday, May 18, 2010 8:45:09 PM GMT -05:00 US/Canada Eastern
Subject: [Limdep Nlogit List] double hurdle models
Dear all
I would like to restrict rho=0 in a double-hurdle estimation, but I cannot
see how to do this.
I have the general code
Probit...;hold$
Select; tobit; ...$
The estimate of rho=1 gives me the same model estimate as the Heckman
2-stage selection model (using ;mle does not converge, so I am
investigating).
Thank you in advance
Brett
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