How to Generate a Sample Using the Sample Function in R?
In this article, we will discuss how to generate a sample using the sample function in R.
Sample() function is used to generate the random elements from the given data with or without replacement.
Syntax:
sample(data, size, replace = FALSE, prob = NULL)
where,
- data can be a vector or a dataframe
- size represents the size of the sample
- replace is used to set the values again repeated if it is set to true
- prob: a vector of probability weights for obtaining the elements of the vector being sampled
Example 1: Generate sample data from the vector
Here, we will generate the n sample data from the given vector with 11 elements using the sample function.
R
# consider the vector data= c (23,45,21,34,5,6,7,8,86,45,3) # get 4 random elements print ( sample (data,4)) # get 1 random element print ( sample (data,1)) # get 6 random elements print ( sample (data,6)) |
Output:
[1] 45 7 5 34 [1] 3 [1] 5 23 8 21 6 45
Example 2: Generate sample data from the vector by replacing
Here we are going to create a vector with 11 elements and generate the sample data with a replacement.
R
# consider the vector data= c (23,45,21,34,5,6,7,8,86,45,3) # get 4 random elements print ( sample (data,4,replace= TRUE )) # get 1 random element print ( sample (data,1,replace= TRUE )) # get 6 random elements print ( sample (data,6,replace= TRUE )) |
Output:
[1] 45 5 5 3 [1] 86 [1] 5 5 8 7 8 45
Example 3: Sampling with Uneven Probabilities Using sample Function
Here we are going to select the elements with higher probability than others by setting the probability using the prob parameter.
R
# consider the vector data= c (23,45,21,34,5) # get 10 random elements with probability print ( sample (data, size = 10, replace = TRUE , prob = c (0.6,0.1,0.1,0.1,0.1))) |
Output:
[1] 23 23 23 23 23 45 23 23 23 23
Example 4: Random Sampling of Data Frame Rows Using sample Function
Here we are going to sample the dataframe, let us create a dataframe and sample the rows.
R
# create dataframe with 2 columns data= data.frame (col1= c (1:10),col2= c (12:21)) # get the sample of 4 in each column data[ sample (1: nrow (data), size = 4), ] |
Output:
Example 5: Random Sampling of List Elements Using sample Function
Here we are going to sample the data in the list with size 4
R
# create list with some integers data= list (1,2,3,4,5,6) # get the sample of 4 data[ sample (1: length (data), size = 4)] |
Output:
[[1]] [1] 2 [[2]] [1] 1 [[3]] [1] 4 [[4]] [1] 6
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