cramersv {confintr} | R Documentation |
Cramer's V
Description
This function calculates Cramer's V, a measure of association between two categorical variables.
Usage
cramersv(x)
Arguments
x |
The result of |
Details
Cramer's V is a scaled version of the chi-squared test statistic \chi^2
and
takes values in [0, 1]
. It is calculated as
\sqrt{\chi^2 / (n \cdot (k - 1))}
, where n
is the number of observations,
and k
is the smaller of the number of levels of the two variables.
Yates continuity correction is never applied. So in the 2x2 case, if x
is the
result of stats::chisq.test()
, make sure no continuity correction was applied.
Otherwise, results can be inconsistent.
Value
A numeric vector of length one.
References
Cramer, Harald. 1946. Mathematical Methods of Statistics. Princeton: Princeton University Press, page 282 (Chapter 21. The two-dimensional case).
See Also
Examples
cramersv(mtcars[c("am", "vs")])