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Re: st: RE: Poisson regression with score/scale as DV


From   David Hoaglin <dchoaglin@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Poisson regression with score/scale as DV
Date   Tue, 3 Apr 2012 06:48:36 -0400

It would help to know more about the "pile-up of responses at zero."
Do the frequencies of positive scores tend to decrease, with the
largest frequency at 1?  Or do the positive scores have a mode at some
value greater than 1?  Those are two kinds of zero-inflated mixtures.
You may need a mixture or two-part model.

David Hoaglin
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