Tests for the Equality of Coefficients of Variation from Multiple Groups

Contains functions for testing for significant differences between multiple coefficients of variation. Includes Feltz and Miller's (1996) asymptotic test and Krishnamoorthy and Lee's (2014) modified signed-likelihood ratio test. See the vignette for more, including full details of citations.

output: github_document

Last-changedate minimal R version Licence Travis-CI Build Status Coverage Status cran version rstudio mirror downloads ORCiD

This package contains functions to test for significant differences in coefficients of variation (CVs) among multiple groups of observations.


If you use this package, please cite both the package and the paper that first presented the algorithm that you used (see the vignette on CRAN for details of these). Cite the package as follows:

And reference it in your text similar to this example:

"We used the R package cvequality (Version 0.2.0; Marwick and Krishnamoorthy 2019) to test for significant differences [etc.]."

A BibTeX entry for LaTeX users is:

    title = {cvequality: Tests for the Equality of Coefficients of Variation from Multiple Groups},
    author = {Ben Marwick and Kalimuthu Krishnamoorthy},
    note = {R package version 0.1.3},
    url = {https://github.com/benmarwick/cvequality},

You can also access the citation details from your R console with citation(package = "cvequality")


To install the package:

# from CRAN

Or you can get the development version from GitHub:

# or from GitHub

Please see the vignette on CRAN for detailed examples of how to use the functions in this package.

Contributing and Getting Help

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

If you'd like to get help with using the package, please post an issue.


cvequality 0.2.0

  • added argument to set seed in functions, thanks to @SebVen
  • added content to vignette to show how to set seed

cvequality 0.1.3

  • removed tidyverse from suggests
  • Added citation info

cvequality 0.1.0

  • Added a NEWS.md file to track changes to the package.

Reference manual

It appears you don't have a PDF plugin for this browser. You can click here to download the reference manual.


0.2.0 by Ben Marwick, 3 years ago


Report a bug at https://github.com/benmarwick/cvequality/issues

Browse source code at https://github.com/cran/cvequality

Authors: Ben Marwick [aut, cre] , Kalimuthu Krishnamoorthy [aut]

Documentation:   PDF Manual  

MIT + file LICENSE license

Suggests knitr, ggplot2, rmarkdown, testthat, dplyr, tidyr, ggbeeswarm, covr

See at CRAN