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st: Re: st: Re: st: RE: Truncated sample or Heckman selection‏


From   Joerg Luedicke <joerg.luedicke@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: st: Re: st: RE: Truncated sample or Heckman selection‏
Date   Thu, 4 Oct 2012 16:45:59 -0500

On Thu, Oct 4, 2012 at 4:34 PM, Ebru Ozturk <ebru_0512@hotmail.com> wrote:
> For Tobit regression, the dependent variable is the percent of total firm sales revenues that derived from the sales of new products. Therefore, it is censored as sales of new products can only be zero or positive.
>
This just isn't a censoring problem. Consider having a look at:

http://en.wikipedia.org/wiki/Censoring_%28statistics%29

Joerg
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