Calculate the "phi coefficient" between two binary variables
The phicoef function calculates the "phi coefficient" between
two binary variables.
phicoef(x, y=NULL)
x, y |
Two logical vectors of the same length.
If |
The "phi coefficient" between the two binary variables. This is a single numeric value ranging from -1 to +1.
H. Pagès
set.seed(33) x <- sample(c(TRUE, FALSE), 100, replace=TRUE) y <- sample(c(TRUE, FALSE), 100, replace=TRUE) phicoef(x, y) phicoef(rep(x, 10), c(rep(x, 9), y)) stopifnot(phicoef(table(x, y)) == phicoef(x, y)) stopifnot(phicoef(y, x) == phicoef(x, y)) stopifnot(phicoef(x, !y) == - phicoef(x, y)) stopifnot(phicoef(x, x) == 1)
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