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Re: st: Nominal or ordinal?


From   Richard Williams <richardwilliams.ndu@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Nominal or ordinal?
Date   Thu, 12 Aug 2010 23:18:25 -0500

At 09:06 PM 8/12/2010, Alan Acock wrote:
I don't have a hand reference, but if you generate a series of monotonic transformations of an interval scale, the linear correlations of each transformation with the interval scale variable will almost all be over .9. Of course, a non monotonic transformation would not do this, nor would it be ordinal. Also, it is possible to have an extreme monotonic transformation for which a straight line does terribly.
Alan Acock
acock@mac.com

Alan, can you clarify? Are you talking about, say, different ways of collapsing a variable into 5 categories, where you use different cutpoints each time? Or something else?


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