Take Random Samples from a Data Frame in R Programming – sample_n() Function
Last Updated :
19 Jun, 2020
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:
library(dplyr)
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") )
sample_n(d, 3)
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Output:
name age ht school
1 Chaman 9 NA no
2 Abhi 7 46 yes
3 Bhavesh 5 NA yes
Example 2:
library(dplyr)
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") )
sample_n(d, 3, fac = "name")$name
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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.
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