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


From   Ebru Ozturk <ebru_0512@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Re: st: Re: st: RE: Truncated sample or Heckman selection‏
Date   Fri, 5 Oct 2012 00:53:09 +0300

Innovation success is heavily left-censored - many firms do not have any market novelties and thus no sales from this type of innovation (Grimpe & Kaiser, 2010). 

Is that wrong then?

I'm really confused now.

Ebru

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