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
THE AUTHOR (USDA FOREST SERVICE, FOREST PRODUCTS LABORATORY) DOES
GUARANTEE OR MAKE ANY REPRESENTATIONS REGARDING
THE SOFTWARE OR DOCUMENTATION IN TERMS OF THEIR CORRECTNESS,
CURRENTNESS, OR OTHERWISE. THE ENTIRE RISK AS TO THE RESULTS AND
PERFORMANCE OF THE SOFTWARE IS ASSUMED BY YOU. IN NO CASE WILL ANY
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.
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.
also have programs that do the following:
The theory behind these programs is described in three publications:
Confidence Bounds for Normal and Lognormal Distribution Coefficients of Variation,
2003, Research Paper 609, USDA Forest Products Laboratory, Madison, Wisconsin.
Confidence Bounds and Hypothesis Tests
for Normal Distribution Coefficients of Variation,
2007, Research Paper 638, USDA Forest Products Laboratory, Madison,
- Verrill, S. and Johnson, R.A. (2007). "Confidence Bounds and
Hypothesis Tests for Normal Distribution Coefficients of Variation."
Communications in Statistics -- Theory and Methods, Volume 36,
Number 12, pages 2187-2206.
For questions or comments about this Web page, please contact Steve Verrill at
[FPL Statistics Group]
Last modified on 9/9/09.
As of last midnight, this page had been accessed