How to create boxplot for multiple categories in base R?

To create the boxplot for multiple categories, we should create a vector for categories and construct data frame for categorical and numerical column. Once the construction of the data frame is done, we can simply use boxplot function in base R to create the boxplots by using tilde operator as shown in the below example.

Example

Consider the below data frame −

 Live Demo

Categories<-sample(LETTERS[1:5],500,replace=TRUE) Rate<-rnorm(500,8,2) df<-data.frame(Categories,Rate) head(df,20)

Output

  Categories    Rate 1    C       4.618484 2    B       8.513390 3    A       9.071579 4    B       9.744654 5    C       5.963608 6    E       9.959320 7    A       9.803821 8    D       7.420664 9    C       7.776794 10   C       4.810012 11   B       8.556322 12   E       8.621443 13   B       7.353419 14   B       6.690489 15   A       12.806544 16   D       8.008669 17   B       10.102333 18   A       4.799457 19   D       6.999711 20   D       10.013520

Creating boxplot of Rate for categories −

Example

boxplot(df$Rate~df$Categories)

Output