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RE: st: How do I test that two subsample have different coefficient of variation?


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: How do I test that two subsample have different coefficient of variation?
Date   Fri, 11 Jul 2008 10:36:16 +0100

Science magazine carried a piece recently on how miles per gallon
misleads, while gallons per mile is a more natural scale. 

I've seen this picked up in many forums as a kind of discovery or
breakthrough, which does makes me wonder. 

<http://www.aaas.org/news/releases/2008/0620fuel_efficiency.shtml> 

The original article will also be accessible to many readers. 

The point does also often arise with analyses of the auto data.... 

Nick
n.j.cox@durham.ac.uk 

Verkuilen, Jay

Many seemingly ratio scale variables are actually log-interval, e.g.,
gas mileage, which can be equally well represented as miles per gallon
or gallons per mile. 

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