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craggit fits Cragg's "two-tier" (also sometimes called "two-stage"
or "double-hurdle") alternative to tobit for corner-solution models,
which incorporates the probit model in the first tier and truncated
normal regression in the second tier (e.g., truncreg with a lower
limit = 0). The main advantage of craggit over tobit is that an
independent variable's effect on the probability of a positive outcome
and its effect on the quantity of that outcome are determined by
separate processes. Also, tobit is nested in craggit, making it a
popular choice among "two-tier"models.
More information: http://www.stata-journal.com/article.html?article=st0179
2010/5/11 Martin Weiss <email@example.com>:
> Forwarded on behalf of Vincenzo. Note it is better to contact the list
> So, does anyone know about the fate of -dhurdle-? I have an old version
> *! version 1.0 12 Feb 2003
> lying around on my hard drive...
> -----Ursprüngliche Nachricht-----
> Von: vincenzo salvucci [mailto:firstname.lastname@example.org]
> Gesendet: Dienstag, 11. Mai 2010 15:40
> An: email@example.com
> Betreff: dhurdle-stata
> Dear Sir,
> My name is Vincenzo and I'm a phd student.
> I found on the web
> (http://www.stata.com/statalist/archive/2009-02/msg00650.html) that
> you answered to a thread about -dhurdle- in stata.
> Since the webpage where this file was previously available
> (http://www.sml.hw.ac.uk/somjaf/Stata/dhurdle.zip) does not exist
> anymore, I was wondering whether it could be possible for you to send
> me the file "dhurdle.zip".
> Thank you in advance,
> Best regards
> Vincenzo Salvucci
> Ph.D. student
> Dipartimento di Economia Politica (Department of Economics)
> Facoltà di Economia "Richard M. Goodwin" (Faculty of Economics)
> Università degli Studi di Siena
> Piazza S.Francesco, 7 - 53100 Siena, Italy
> Email: firstname.lastname@example.org
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Joao Ricardo Lima, D.Sc.
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