Dealing with Missing Data

Following the advice of the last chapter, you will get a shiny new dataset from the web or a database. You get to work on it. All of a sudden, you find yourself getting warnings about missing values and odd results from tests you're running. You take a closer look at the data and notice that a good proportion of your data—in multiple columns—has NA values. Uh oh.

Desperate, you check if there were import errors; there doesn't seem to be any. What are you going to do?