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Re: st: Tobit interaction effect

From   Maarten Buis <>
Subject   Re: st: Tobit interaction effect
Date   Thu, 10 May 2012 11:17:11 +0200

On Wed, May 9, 2012 at 10:31 PM, Ebru Ozturk wrote:
> I would like to measure the interaction effects as it is in OLS. My data is cross-sectional and dependent variable is censored. So, I guess I need to see the expected value of the observed value. I use Stata 10.

Not necessarily. Given that information I could just as easily justify
the interpretation in terms of the latent variable or the observed
values and the censored values fixed at the cut-off point.

As I said before: if you interpret your results in terms of the latent
variable you can just do what you would always do in a linear
regression(*). When you want the other interpretation you will need to
derive the cross partial derivatives yourself. Once you have done that
you can use -predictnl- to compute those effects and their standard
error for each observation.

-- Maarten

(*) Notice that OLS is just an algorithm while linear regression is
the model. I guess you mean the latter and not the former.

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
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