Nothing
cr.forward <-
function (x, y, weights)
{
yname <- as.character(substitute(y))
if (!is.factor(y))
y <- factor(y, exclude = NA)
ylevels <- levels(y)
kint <- length(ylevels) - 1
y <- as.integer(y)
names <- dimnames(x)[[2]]
if (length(names) == 0)
names <- paste("V", 1:dim(x)[2], sep = "")
expand <- list()
for (k in 1:kint) {
expand[[k]] <- cbind(y[is.element(y, k:(kint + 1))], weights[is.element(y, k:(kint + 1))],
x[is.element(y, k:(kint + 1)), ])
expand[[k]][, 1] <- ifelse(expand[[k]][, 1] == k, 1,
0)
cp <- matrix(rep(0, dim(expand[[k]])[1] * kint), ncol = kint)
cp[, k] <- 1
dimnames(cp)[[2]] <- paste("cp", 1:kint, sep = "")
expand[[k]] <- cbind(expand[[k]], cp)
dimnames(expand[[k]])[[2]] <- c("y", "weights", names, paste("cp",
1:kint, sep = ""))
}
newx <- expand[[1]]
for (k in 2:kint) newx <- rbind(newx, expand[[k]])
newx
}
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