Nothing
cindex.categorization <-
function (x, y) {
if (!is.Surv(y))
y <- Surv(y)
i <- is.na(x) | is.na(y)
if (any(i)) {
x <- x[!i]
y <- y[!i, ]
}
k <- concordancefit(y, x)$count
cindex <- (k[2] + (k[3]+k[4]+k[5])/2)/sum(k[1:5])
cindex
}
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