Examining number of levels

dplyr has two other functions that can come in handy when exploring a dataset. The first is top_n(x, var), which gets us the first x rows of a dataset based on the value of var. The other is pull(), which allows us to extract a column and take out the name, leaving only the value(s) from the column.

For example, if we wanted to get, as a set of values, the top two mpg values from the classic mtcars dataset, we would write:

mtcars %>%
  top_n(2, mpg) %>%
  pull(mpg)

This gets us:

[1] 32.4 33.9

Use top_n() to print out the 3 rows with the highest number of factor levels.
Filtering for the variable CurrentJobTitleSelect, pull the number of levels it has.

Exercise

Examining number of levels

Instructions