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

manpreet Best Answer 2 years ago

I've just started using R and I'm not sure how to incorporate my dataset with the following ref="https://forum.tuteehub.com/tag/sample">sample code:

ref="https://forum.tuteehub.com/tag/sample">sample(x, size, replace = FALSE, prob = NULL)

I have a dataset that I need to put into a training (75%) and testing (25%) set. I'm not sure what information I'm supposed to put into the x and size? Is x the dataset file, and size how many ref="https://forum.tuteehub.com/tag/sample">samples I have?

manpreet 2 years ago

data(mtcars)

## 75% of the sample size
smp_size <- floor(0.75 * nrow(mtcars))

## set the seed to make your partition reproducible
set.seed(123)
train_ind <- sample(seq_len(nrow(mtcars)), size = smp_size)

train <- mtcars[train_ind, ]
test <- mtcars[-train_ind, ]