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

[Ron�n Conroy <rconroy@rcsi.ie>]

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) 
-------------------- 
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