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Re: st: RE: tobit or anything else?


From   Berthold Hoppe <berthold.hoppe@charite.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: tobit or anything else?
Date   Sun, 13 Apr 2008 10:01:05 +0200

Dear Jay,

you are completely right, it is right skewed. I will try it with - intcens-.
As this command needs a description of the distribution:
Do you know a way to choose the correct type of distribution?

Thanks,
Berthold


Am 12 Apr 2008 um 23:59 schrieb Verkuilen, Jay:


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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