8 The Analysis of Covariance
In This Chapter
Structuring a Conventional ANCOVA
Structuring an ANCOVA Using Regression
Checking for a Common Regression Line
Testing the Adjusted Means: Planned Orthogonal Coding in ANCOVA
ANCOVA and Multiple Comparisons Using the Regression Approach
In previous chapters I’ve noted that it’s possible to use both a factor, measured originally on a nominal scale, and a covariate, measured on an interval scale, as predictors in the same regression equation. For example, suppose that you assign members of a group of 20 people who want to lose weight to one of two groups: one group ...
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