4 Describing Two Variables at a Time

Overview

Two-by-Two: Bivariate Data

Describing Covariation: Two Categorical Variables

Describing Covariation: One Continuous, One Categorical Variable

Describing Covariation: Two Continuous Variables

More Informative Scatter Plots

Application

Overview

Some of the most interesting questions in statistical inquiries involve covariation: how does one variable change when another variable changes? After working through the examples in this chapter, you will know some basic approaches to bivariate analysis, that is, the analysis of two variables at a time.

Two-by-Two: Bivariate Data

Chapter 3 covered techniques for summarizing the variation of a single variable: Univariate distributions. In many statistical investigations, ...

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