cramer {pedometrics}

Association between categorical variables

Description

Compute the Cramer's V, a descriptive statistic that measures the association between categorical variables.

Usage

cramer(x)

Arguments

x

Data frame or matrix with a set of categorical variables.

Details

Any integer variable is internally converted to a factor.

Value

A matrix with the Cramer's V between the categorical variables.

Reverse dependencies

The spsann package, provider of methods for the optimization of sample configurations using spatial simulated annealing in R, requires cramer() for some of its functions to work. The development version of the spsann package is available on https://github.com/Laboratorio-de-Pedometria/spsann-package.

Note

The original code is available at https://sas-and-r.blogspot.com/, Example 8.39: calculating Cramer's V, posted by Ken Kleinman on Friday, June 3, 2011. As such, Ken Kleinman [e-mail] is entitled a ‘contributor’ to the R-package pedometrics.

Author(s)

Alessandro Samuel-Rosa [e-mail]

References

Cramér, H. Mathematical methods of statistics. Princeton: Princeton University Press, p. 575, 1946.

Everitt, B. S. The Cambridge dictionary of statistics. Cambridge: Cambridge University Press, p. 432, 2006.

Examples

if (interactive()) {
  data(meuse, package = "sp")
  str(meuse)
  test <- cramer(meuse[, c("ffreq", "soil", "lime", "landuse")])
}