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st: RE: tobit or anything else?


From   "Verkuilen, Jay" <JVerkuilen@gc.cuny.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: tobit or anything else?
Date   Sat, 12 Apr 2008 17:59:19 -0400

Berthold Hoppe wrote:

>>As -y- in censored (due to lower detection limit of the measurements)

-tobit- instead of -reg- seems to be adequate.<<

Not necessarily. Biological variables subject to lower DLs are
frequently right skewed, sometimes a lot. I would suggest looking at the
program -intcens-, which you can download. This fits interval censored
models, which you can use to handle the DL issue.  

Jay


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