cramer {pedometrics} | R Documentation |
Compute the Cramer's V, a descriptive statistic that measures the association between categorical variables.
cramer(x)
x |
Data frame or matrix with a set of categorical variables. |
Any integer variable is internally converted to a factor.
A matrix with the Cramer's V between the categorical variables.
The original code is available at http://sas-and-r.blogspot.nl/, Example 8.39: calculating Cramer's V, posted by Ken Kleinman on Friday, June 3, 2011. As such, Ken Kleinman <Ken_Kleinman@hms.harvard.edu> is entitled a ‘contributor’ to the R-package pedometrics.
The function bigtabulate
used to compute the chi-squared test is the
main bottleneck in the current version of cramer
. Ideally it will be
implemented in C++.
Alessandro Samuel-Rosa alessandrosamuelrosa@gmail.com
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.
## Not run: data <- read.csv("http://www.math.smith.edu/r/data/help.csv") data <- data[, c("female", "homeless", "racegrp")] str(data) test <- cramer(data) test ## End(Not run)