Lecture Ticket 15

Reading

Read the following sections of IFDAR.

• Chapter 7: sections 7.10 - 7.11, 7.13

Questions

1. What do n() and n_distinct() do? How are they different?

2. What two arguments do we always specify when we use across()?

3. When we use across(), we use it within a few dplyr verbs – what are those verbs?

4. What concepts in dplyr are you confidently understanding? What concepts are you still struggling with?