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Re: st: TOBIT command (just one little question)


From   Ronán Conroy <rconroy@rcsi.ie>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: TOBIT command (just one little question)
Date   Fri, 04 Mar 2005 15:52:44 +0000

Barbara Hofmann wrote:

hello out there,

i got one question concerning the use of the tobit-command:

i want to estimate women's labour supply by weekly hours. to control that
a lot of women do not work at all, i wanna use the tobit model.

This looks to me like a Heckman model, and, indeed, the example used to illustrate the -heckman- command in the manual is similar to yours. A tobit model implies that zero is a censoring value. Labour hours cannot be negative, so zeros are real, not censoring.

--

Ronan M Conroy (rconroy@rcsi.ie) Senior Lecturer in Biostatistics Royal College of Surgeons Dublin 2, Ireland +353 1 402 2431 (fax 2764) -------------------- Just say no to drug reps http://www.nofreelunch.org/

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