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Re: st: regression with dependent variable ranging from 0 to 1


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: regression with dependent variable ranging from 0 to 1
Date   Tue, 30 Dec 2008 19:16:37 +0000 (GMT)

--- Andrea Rispoli <andrea.rspl@gmail.com> wrote:
> It is an Herfindahl index of concentration, it ranges from 0 to 1 (in
> principle) : in my specific case:
> 
> Variable |       Obs        Mean    Std. Dev.       Min        Max
>
-------------+--------------------------------------------------------
>  H         |    213620    .0190621    .0920916          0   .6477536

How many zeros do you have? ( type in Stata: -count if H == float(0)- )
Even though it is possible for a fractional logit to model a dependent
variable that includes zero (and one), if there are too many of these,
then that might indicate that these zeros occur due to a separate
process and need to be modeled separately.

-- Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room N515

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      
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