How to split data into training/testing sets using sample function

Question

I\'ve just started using R and I\'m not sure how to incorporate my dataset with the following sample code:

sample(x, size, replace = FALSE, prob = NULL)
         


        

Answer 1

Just a more brief and simple way using awesome dplyr library:

library(dplyr)
set.seed(275) #to get repeatable data

data.train <- sample_frac(Default, 0.7)

train_index <- as.numeric(rownames(data.train))
data.test <- Default[-train_index, ]