Models with 10Continuous and Categorical Predictors: ANCOVA The material covered in this chapter represents an integration of the material covered in Chapters 6 and 9. In Chapter 6 we considered models with continuous predictors; Chapter 9 was concerned with models with categorical predictors. We will now consider models that include both sorts of predictors. Such models are more traditionally covered under the heading of analysis of covariance (ANCOVA). We feel that this is a confusing label for these models and prefer to think of them simply as models involving both categorical and continuous predictor variables.