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From |
Michael Horowitz <horowitz@fas.harvard.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
RE: st: question about heckprob |

Date |
Wed, 18 May 2005 18:32:48 -0400 (EDT) |

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 > pjyotsna@hotmail.com > > > > > ----Original Message Follows---- > From: Michael Horowitz <horowitz@fas.harvard.edu> > Reply-To: statalist@hsphsun2.harvard.edu > To: statalist@hsphsun2.harvard.edu > 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 > > pjyotsna@hotmail.com > > > > > > > > > > ----Original Message Follows---- > > From: Michael Horowitz <horowitz@fas.harvard.edu> > > Reply-To: statalist@hsphsun2.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 > > > > * > > * 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/

**Follow-Ups**:**RE: st: question about heckprob***From:*Rafal Raciborski <rafal.raciborski@emory.edu>

**References**:**RE: st: question about heckprob***From:*"jyotsna puri" <pjyotsna@hotmail.com>

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