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

From   Clinton Thompson <>
Subject   Re: st: RE: Poisson regression with score/scale as DV
Date   Tue, 3 Apr 2012 13:30:21 +0200

Approximately a quarter of the values are zero with no other score
emerging as a clear runner-up in terms of frequency of values.  In
fact, the remaining values, [1,27], range from <1% up to >6% of the
frequency distribution w/ the responses exhibiting no discernible


On Tue, Apr 3, 2012 at 12:48 PM, David Hoaglin <> wrote:
> 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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