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st: Re: Left-censoring in Tobit


From   "Paolo Canino" <pcanino@hsn.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Left-censoring in Tobit
Date   Tue, 30 Sep 2003 17:43:20 +0200

Eric,
the solution is the one you expected:
try to run tobit y x, ll(0) and it would have to work.

Paolo

Paolo Canino
Istituto per la ricerca sociale
Via XX settembre, 24
20123 Milano
Italy
tel. +39.02.4676.4272
fax.+39.02.4676.4227
----- Original Message -----
From: "Neumayer,E" <E.Neumayer@lse.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, September 30, 2003 5:37 PM
Subject: st: Left-censoring in Tobit


> Hi,
>
> I have a dependent variable that is left-censored in the following sense.
Any values equal to 1 or above are recorded with their actual value. Any
values less than 1 are coded as zero. I thought I had to run the estimation
as
>
> tobit y x, ll(1)
>
> However, if I do this, then Stata also counts all observations with value
of 1 as censored. Should I therefore run
>
> tobit y x, ll(0) or something like tobit y x, ll(0.99)?
>
> Any help greatly appreciated. Best, Eric Neumayer
>
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>
>

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