Random Samples and Permutations

Description

sample takes a sample of the specified size from the elements of x using either with or without replacement sampling according to the value of replace.

By default size is equal to length(x) so that sample(x) generates a random permutation of the elements of x.

If x has length 1, sampling takes place from 1:x.

Usage

sample(x, size, replace=FALSE)

Examples

x <- 1:12
# a random permutation
sample(x)
# bootstrap sampling
sample(x,replace=TRUE)

# 100 Bernoulli trials
sample(c(0,1), 100, replace = TRUE)