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Re: st: continuous data measured as ordinal catogories

From   Maarten buis <>
Subject   Re: st: continuous data measured as ordinal catogories
Date   Fri, 9 Apr 2010 00:25:45 -0700 (PDT)

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen

--- On Fri, 9/4/10, Richard Williams wrote:
> If you want it as an independent variable, my first impulse
> is to break it into dummies.  

A somewhat uncommon but sometimes useful interpretation of such
a model is that it simultaneously fits an optimal scale for 
your ordinal variable and an effect of that optimally scaled 
variable. The scale is optimal in the sense that it best 
predicts the dependent variable. The sheaf-coefficients, as 
implemented in -sheafcoef-, uses that approach. This allows 
you to _both_ present a single effect of willingness to pay and 
use the more flexible approach proposed Richard. You can 
download -sheafcoef- by typing -ssc install sheafcoef-, and it
is discussed in this paper: <>

Hope this helps,


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