If you would simply like to run this code over the Web, go here.

The theory behind this program is discussed in two publications:

- Confidence Bounds and Hypothesis Tests for Normal Distribution Coefficients of Variation, 2007, Research Paper 638, USDA Forest Products Laboratory, Madison, Wisconsin.
- 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.

The FORTRAN source for this code comes in five files:

- covratio.f --- A FORTRAN main routine written by Steve Verrill of the USDA Forest Service Forest Products Laboratory.
- rnor.f --- rnor is a FORTRAN routine that generates normally distributed random numbers with mean 0, variance 1. It was written by David Kahaner and George Marsaglia. It includes uni, a FORTRAN routine that generates uniform random numbers on [0,1]. uni was written by James Blue, David Kahaner, and George Marsaglia.
- dfzero.f --- dfzero is a FORTRAN routine that searches "for a zero of a function F(X) in a given interval (B,C)". It was written by L.F. Shampine and H.A. Watts.
- dpsort.f --- dpsort is a FORTRAN routine that sorts double precision numbers. It was written by Steve Verrill.

The program also depends upon DCDFLIB. DCDFLIB is a public domain library of "routines for cumulative distribution functions, their inverses, and their parameters." It was produced by Barry Brown, James Lovato, and Kathy Russell of the Department of Biomathematics, M.D. Anderson Cancer Center, The University of Texas. DCDFLIB can be found at http://biostatistics.mdanderson.org/SoftwareDownload/SingleSoftware.aspx?Software_id=21 .

Last modified on 9/9/09.

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