I checked my copy of Coleman, and he does not use Poisson models for
ordinal attidunal scales. All the applications of thie Poisson model in
his book are to counts of events. David Greenberg, Sociology Department,
New York University
----- Original Message -----
From: David Bell <[email protected]>
Date: Wednesday, October 11, 2006 3:47 pm
Subject: Re: st: NBREG for ordinal scales
> On Oct 10, 2006, at 1:08 PM, n j cox wrote:
>
> > I think it's pretty much wired in that Poisson,
> > negative binomial, etc., really are for counts.
> >
> Actually, I seem to recall that Poisson processes are based on
> probabilities of changes of state. If you are counting the
> sequential changes, then you have count data and it is
> straightforward to label each state with the number of persons (or
> other entities) the state represents. If, on the other hand, the
> changes are psychological (such as the change from being strongly
> opposed to some action to being "only opposed") then the labels for
>
> the states are not counts. As I recall, James Coleman, in
> Introduction to Mathematical Sociology (1965) used Poisson models
> of
> responses to ordinal attitudinal scales.
>
> The approach never became popular in sociology, but it gives a
> justification for using Poisson and related processes on non-count
> data, as Matthew seems to want to do.
>
> Dave
> ====================================
> David C. Bell
> Sociology
> Indiana University Purdue University Indianapolis (IUPUI)
> ====================================
>
>
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