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


From   "Verkuilen, Jay" <JVerkuilen@gc.cuny.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: regression with dependent variable ranging from 0 to 1
Date   Tue, 30 Dec 2008 15:38:28 -0500

Al Feiveson wrote:

>>Andrea - How many exact zeros do you have? This looks like a mixed
discrete-continuous distribution, requiring something like a
zero-inflated model. Also, do you have repeated measures; i.e. is there
a clustering variable involved here?<<

It could be one of those. I'm (slowly) working on a paper for a zero
inflation model on this. We had issues getting these to fit as it's hard
to tell a degenerate boundary beta mixed with an L-shaped one. 

These concentration indices are, if I'm not mistaken, actually somewhat
discrete, too, but I could be wrong. I don't recall the exact formula
for the H-H index. 

JV

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