Exercise

Unnesting

The opposite of the nest() operation is the unnest() operation. This takes each of the data frames in the list column and brings those rows back to the main data frame.

In this exercise, you are just undoing the nest() operation. In the next section, you'll learn how to fit a model in between these nesting and unnesting steps that makes this process useful.

Instructions

100 XP

Unnest the data list column, so that the table again has one row for each country-year pair, much like by_year_country.

Take Hint (-30 XP)