See how to join two data sets by one or more common columns using base R’s merge function, dplyr join functions, and the speedy data.table package.

Option 1 - data table: The best solution is to simply provide this as an accessible HTML data table. This will give the student independent access to the data without changing the visual format.

For some data.table users, “dot-SD” is a bit of a mystery. But data.table creator Matt Dowle told me that it’s actually quite simple: Just think of it as a symbol representing “each group ...

This data table shows children's favourite colours. The most popular colour is blue, as 12 children picked this. The least popular colour is orange, as only 3 children picked this.