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A Re-Sampling Approach 1
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set.seed(1)
x <- rbind(xtrain, xtest)
y <- c(as.numeric(ytrain), as.numeric(ytest))
x <- as.matrix(x)
x1 <- x[which(y == 2),]
x2 <- x[which(y == 4),]
n1 <- nrow(x1)
n2 <- nrow(x2)
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