Ok maybe I have these things spun around. Here is a snapshot of what the
data might look like:
dv1 dv2
0 0
0 0
1 0
1 0
1 0
1 1
0 0
0 0
1 1
Should I flip these around? Do I have the selection variable in the wrong
place or something? dv1 is the initiation of disputes and dv2 is the
escalation of disputes. So all cases where dv1=1 don't mean dv2=1. What
am I doing wrong?
Mike
On Wed, 18 May 2005, jyotsna puri wrote:
> The way I understand it, as of now:
> Within subset dv2==1 (select variable),
> dv1==1 always.
>
> Question: Why is dv1 different from dv2
> within this subset?
>
> My thoughts:
> I know you are trying to find out whether the
> variables that impact selection also impact
> scale (of dispute). Shouldn't you have a dv1 which
> says something like
> dv1 =1 if disputes escalate
> dv1 =0 otherwise.
> Otherwise, there is no way for the specf'n to
> distinguish between the two variables (dv1 and dv2)....
>
> Or is there something here that I am not seeing?
>
>
>
>
>
> Jyotsna (Jo) Puri
> Cell and Voicemail: 201-805-1690
> [email protected]
>
>
>
>
> ----Original Message Follows----
> From: Michael Horowitz <[email protected]>
> Reply-To: [email protected]
> To: [email protected]
> Subject: RE: st: question about heckprob
> Date: Wed, 18 May 2005 17:30:51 -0400 (EDT)
>
> Ok. dv2 is a subset of dv1. All times dv2 is 1, dv1 is 1, but many of
> the times where dv1 is 1, dv2 is not 1. Does that make sense? Should the
> DV be set up differently?
>
> On Wed, 18 May 2005, jyotsna puri wrote:
>
> > Michael,
> > Can you check/send a cross-tab of dv1 and
> > dv2, i.e.
> > table dv2 dv1
> > Is dv1 varying within dv2==1? The way you've explained your
> > variable construction below, it may not be.
> > Considered using a Tobit?
> > -Jo
> >
> > Jyotsna (Jo) Puri
> > Cell and Voicemail: 201-805-1690
> > [email protected]
> >
> >
> >
> >
> > ----Original Message Follows----
> > From: Michael Horowitz <[email protected]>
> > Reply-To: [email protected]
> > To: [email protected]
> > 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
> >
> > *
> > * For searches and help try:
> > * http://www.stata.com/support/faqs/res/findit.html
> > * http://www.stata.com/support/statalist/faq
> > * http://www.ats.ucla.edu/stat/stata/
> >
> >
> > *
> > * For searches and help try:
> > * http://www.stata.com/support/faqs/res/findit.html
> > * http://www.stata.com/support/statalist/faq
> > * http://www.ats.ucla.edu/stat/stata/
> >
>
> *******************************************************************************
>
> Michael Horowitz
> 78 Kirkland Street, #1
> Cambridge, MA 02138
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*******************************************************************************
Michael Horowitz
78 Kirkland Street, #1
Cambridge, MA 02138
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
