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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

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

Date |
Thu, 10 Jul 2008 18:14:00 +0100 |

I'd map this to the equivalent test that the standard deviations, or if you prefer variances, of log price are different for foreign and domestic cars, modulo numerous reservations on how fragile such tests are. Such literature as there is on this topic seems inordinately concentrated in systematic zoology (and indeed _Systematic Zoology_), e.g. Lewontin, R.C. 1966. On the measurement of relative variability. Systematic Zoology 15: 141--142. A more general comment is that whenever people are tempted to use coefficients of variation it is usually a signal that they should be working on log scales. Nick n.j.cox@durham.ac.uk Antonio Vezzani If, for example, in auto.dta I want to test that price have different coefficient of variation for foreign and domestic auto, which is the right procedure? * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: How do I test that two subsample have different coefficient of variation?***From:*Antonio Vezzani <antonio.vezzani@uniroma2.it>

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