Nothing
ari <-
function(x,y){
x <- as.vector(x)
y <- as.vector(y)
xx <- outer(x, x, "==")
yy <- outer(y, y, "==")
upper <- row(xx) < col(xx)
xx <- xx[upper]
yy <- yy[upper]
a <- sum(as.numeric(xx & yy))
b <- sum(as.numeric(xx & !yy))
c <- sum(as.numeric(!xx & yy))
d <- sum(as.numeric(!xx & !yy))
ni <- (b + a)
nj <- (c + a)
abcd <- a + b + c + d
q <- (ni * nj)/abcd
ari <- (a - q)/((ni + nj)/2 - q)
ari
}
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