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From |
"Austin Nichols" <austinnichols@gmail.com> |

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 12:12:03 -0400 |

Nick-- Suppose the original poster wants to compare income distributions--the sd of log income is a common measure applied to such distributions, but income can be zero or negative, though mean income in some population is unlikely to be zero. The CV is a natural comparison measure, as is squared CV or any other inequality measure discussed in Stephen Jenkins' talk (http://www.stata-journal.com/article.html?article=st0095) or SSC programs (findit jenkins). ps. why not degrees Kelvin? On Fri, Jul 11, 2008 at 5:57 AM, Nick Cox <n.j.cox@durham.ac.uk> wrote: > There are some references in > > Sokal, R.R. and Rohlf, F.J. 1995. Biometry. New York: W.H. Freeman. > > The rough argument for thinking logarithmically goes like this. It makes > sense to work with the coefficient of variation whenever standard > deviation is proportional to mean. That implies that variability is > multiplicative, not additive, which in turn implies working on a > logarithmic scale. * * 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/

**Follow-Ups**:**RE: st: How do I test that two subsample have different coefficient of variation?***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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

**Re: st: How do I test that two subsample have different coefficient of variation?***From:*Maarten buis <maartenbuis@yahoo.co.uk>

**Re: st: How do I test that two subsample have different coefficient of variation?***From:*"Austin Nichols" <austinnichols@gmail.com>

**RE: st: How do I test that two subsample have different coefficient of variation?***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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