Take Random Samples from a Data Frame in R Programming – sample_n() Function
sample_n() function in R Language is used to take random sample specimens from a data frame.
Syntax: sample_n(x, n)
Parameters:
x: Data Frame
n: size/number of items to select
Example 1:
# R program to collect sample data # from a data frame # Loading library library(dplyr) # Create a data frame d <- data.frame( name = c("Abhi", "Bhavesh", "Chaman", "Dimri"), age = c(7, 5, 9, 16), ht = c(46, NA, NA, 69), school = c("yes", "yes", "no", "no") ) # Printing three rows sample_n(d, 3) |
Output:
name age ht school 1 Chaman 9 NA no 2 Abhi 7 46 yes 3 Bhavesh 5 NA yes
Example 2:
# R program to collect sample data # from a data frame # Loading library library(dplyr) # Create a data frame d <- data.frame( name = c("Abhi", "Bhavesh", "Chaman", "Dimri"), age = c(7, 5, 9, 16), ht = c(46, NA, NA, 69), school = c("yes", "yes", "no", "no") ) # Printing three rows sample_n(d, 3, fac = "name")$name |
Output:
[1] Chaman Bhavesh Dimri Levels: Abhi Bhavesh Chaman Dimri
Here, in the above code, column name is specified. Hence, the size is applied within the factor.