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RE: st: Re: st: Re: st: Re: st: 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: st: Re: st: Re: st: Re: st: RE: Truncated sample or Heckman selection‏
Date   Fri, 5 Oct 2012 21:09:11 +0300

Thank you for your e-mail.

Ebru

----------------------------------------
> Date: Fri, 5 Oct 2012 18:56:02 +0200
> Subject: st: Re: st: Re: st: Re: st: Re: st: Re: st: Re: st: RE: Truncated sample or Heckman selection‏
> From: maartenlbuis@gmail.com
> To: statalist@hsphsun2.harvard.edu
>
> On Fri, Oct 5, 2012 at 6:38 PM, Ebru Ozturk <ebru_0512@hotmail.com> wrote:
> > 1. I restrict sample to innovating firms and the dependent variables that I am interested in are percentages therefore, you agree on that I should use fractional logit model.
> >
> > 2. I do not need to do Heckman sample selection even though I restrict my sample. I also want to mention that yes I do not have some Xs but I still do have other Xs for non-innovators which I use them as control variables.
>
> In that end the choice of model can only be yours not ours, so don't
> try to shift responsibility for your choices on us.
>
> > 3. Do you think using a different model puts me trouble?
>
> Of course it will cause trouble; all models cause trouble.
>
> > 4. I use Stata 10 so can I use fractional logit model?
>
> yes
>
> > 5. What about if I have a panel data? Is fractional logit model still applicable?
>
> I vaguely remember that Jeff Wooldridge published some papers on that,
> you might want to look those up.
>
> -- Maarten
>
> ---------------------------------
> Maarten L. Buis
> WZB
> Reichpietschufer 50
> 10785 Berlin
> Germany
>
> http://www.maartenbuis.nl
> ---------------------------------
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