How it works...

The beauty of the dplyr package is that it allows us to chain several operations together one after the other. This greatly reduces the complexity of our code, generating very simple and readable code. The ungroup statement is not strictly needed, but it destroys the grouped structure that we have had up to that point. In certain situations, this is necessary, because we might need to work on the ungrouped data after some grouping or summarizing is done.