14. Analysis of Covariance: The Basics

IN THIS CHAPTER

The Purposes of ANCOVA 362

Using ANCOVA to Increase Statistical Power 363

Testing for a Common Regression Line 372

Removing Bias: A Different Outcome 375

The very term analysis of covariance sounds mysterious and forbidding. And there are enough ins and outs to the technique (usually called ANCOVA) that this book spends two chapters on it—as it does with t-tests, ANOVA, and multiple regression. This chapter discusses the basics of ANCOVA, and Chapter 15, “Analysis of Covariance: Further Issues,” goes into some of the special approaches that the technique requires and issues that can arise.

Despite taking two chapters to discuss here, ANCOVA is simply a combination of techniques you’ve ...

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