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st: question about heckprob


From   Michael Horowitz <horowitz@fas.harvard.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: question about heckprob
Date   Wed, 18 May 2005 16:34:40 -0400 (EDT)

To whom it may concern:

I am trying to run a censored probit model in STATA but I am not sure what
the structure of the 2 dependent variables for the heckprob command needs
to look like.  The way my dependent variable is currently set up is that
there is a 0,1 variable of whether or not states enter into disputes and
then a 0,1 variable that only has values for those states that are in
disputes and codes whether they escalated them (what I want to know is
whether the same variables that influence whether or not states select
into disputes also predict whether states will escalate disputes).

But every time I try to use heckprob I get the following error message:

Fitting probit model:

outcome does not vary; remember:
                                  0 = negative outcome,
        all other nonmissing values = positive outcome
r(2000);


Could someone please help me and tell me what the structure of a
successful heckprob command is (I looked at the help file already) and
more importantly, how the DVs for it are coded.  The way my code is set up
is:

heckprob dv1 iv1 iv2 iv3 iv4 iv5, sel(dv2 = iv4 iv6 iv7)

Mike

*******************************************************************************

Michael Horowitz
78 Kirkland Street, #1
Cambridge, MA 02138

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