Create Boxplot of Grouped Data in R

To create boxplot of grouped data in R, we would first need to convert the grouped data into complete data by repeating the values up to the frequency/count for each value and then use the boxplot function on the complete data.

Check out the below example to understand how it can be done.

Example

Following snippet creates a sample data frame −

Group<-1:5
Count<-sample(20:50,5)
df<-data.frame(Group,Count)
df

Output

The following dataframe is created −

  Group Count
1  1    49
2  2    47
3  3    29
4  4    25
5  5    37

In order to create boxplot of grouped data in R, add the following code to the above snippet −

Group<-1:5
Count<-sample(20:50,5)
df<-data.frame(Group,Count)
Complete_Data<-rep(df$Group,df$Count)
Complete_Data

Output

If you execute all the above given codes as a single program, it generates the following output −

[1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
[38] 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
[75] 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
[112] 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
[149] 4 4 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
[186] 5 5

In order to create boxplot of grouped data in R, add the following code to the above snippet −

boxplot(Complete_Data)

Output

If you execute all the above given codes as a single program, it generates the following output −