Exercise

Factors

Using the str() command, we saw that the region column stores a factor. You can corroborate this by using the class command on the region column.

The function levels shows us the categories for the factor.

Instructions

100 XP

For this question we will combine two functions, in a nested way, to determine the number of unique categories. Use the functions levels and length to determine the number of regions defined by this dataset and contained in murders$region.