Chapter 3. Describing Relationships
Is there a relationship between smoking and lung cancer? Do people who care for dogs live longer? Is your university's admissions department sexist?
Tackling these exciting questions is only possible when we take a step beyond simply describing univariate data sets—one step beyond!
Multivariate data
In this chapter, we are going to describe relationships, and begin working with multivariate data, which is a fancy way of saying samples containing more than one variable.
The troublemaker reader might remark that all the datasets that we've worked with thus far (mtcars and airquality) have contained more than one variable. This is technically true—but only technically. The fact of the matter is that we've only been ...
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