Forest Products Laboratory





A Likelihood Ratio Test of the Equality of the Coefficients of Variation of k Normally Distributed Populations


DISCLAIMER OF WARRANTIES

THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. THE AUTHOR (USDA FOREST SERVICE, FOREST PRODUCTS LABORATORY) DOES NOT WARRANT, GUARANTEE OR MAKE ANY REPRESENTATIONS REGARDING THE SOFTWARE OR DOCUMENTATION IN TERMS OF THEIR CORRECTNESS, RELIABILITY, CURRENTNESS, OR OTHERWISE. THE ENTIRE RISK AS TO THE RESULTS AND PERFORMANCE OF THE SOFTWARE IS ASSUMED BY YOU. IN NO CASE WILL ANY PARTY INVOLVED WITH THE CREATION OR DISTRIBUTION OF THE SOFTWARE BE LIABLE FOR ANY DAMAGE THAT MAY RESULT FROM THE USE OF THIS SOFTWARE.

Sorry about that.



What is the number of populations, k?
(As currently written this web program requires that k be less than or equal to 50. If your k is larger than 50, please e-mail us at sverrill@fs.fed.us)


What are the k sample sizes?


What are the k sample means?


What are the k sample standard deviations?
(The sum of squares divisor in the standard deviation calculation should be n - 1 rather than n.)


What is the istart value for the random number generator?
(An integer between 1 and 1000000000)





This page is a form for performing a likelihood ratio test of the equality of the coefficients of variation of k normally distributed populations. Here is FORTRAN source code for a standalone program that performs the likelihood ratio test.

We also have programs that do the following:

The theory behind these programs is described in three publications:




For questions or comments about this Web page, please contact Steve Verrill at sverrill@fs.fed.us or 608-231-9375.

[Forest Service] [Forest Products Lab] [FPL Statistics Group]


Last modified on 9/9/09.

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