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


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: st: Re: st: Re: st: Re: st: Re: st: Re: st: RE: Truncated sample or Heckman selection‏
Date   Fri, 5 Oct 2012 18:56:02 +0200

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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