Re: Comparing two variation coefficients


Michael.Lacy.junk@xxxxxxxxxxxxx wrote:
Alfred <fredo@xxxxxxxx> wrote:
Dear All,

What test (possibly non -parametric) can be used to test
the differences between two variation coefficient (std dev / mean) ?

Thanks

Fredo

Here's a comprehensive source on your problem and related
ones.

Donnelly SM, Kramer A 1999. Testing for multiple species in fossil
samples: An evaluation and comparison of tests for equal relative
variation. American Journal of Physical Anthropology 108 (4): 507-529

I have to admit that this is the FIRST time that I have heard of
testing the equality two Coefficients of Variations, in parametric
or non-parametric statistics books.

Perhaps there are applications for which the test is appropriate for
a problem at hand, but I can't think of any at this moment.

Perhaps it would be more interesting and instructive for someone to
give a REASON for that specific test of difference of "coefficients of
variation" (a well-defined statistical term), without just citing some
article in a paper in a non statistical journal such as that of
Anthropology.

-- Bob.

.

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