chapter  7
Moderated and Nonlinear Regression Models
Pages 30

Moderated and 7Nonlinear Regression Models In Chapter 6 we considered in some detail models with multiple predictor variables. In this chapter we extend these models by discussing the addition of predictors that are themselves products of other predictors. Such models, as we will show, permit us to extend dramatically the range of questions that we can ask of our data. In the models of Chapter 6, our questions about individual predictor variables had the following generic form: “Is one predictor useful over and above or controlling for the set of other predictors in the model?” In this chapter we will ask a set of rather different questions about predictors. The questions considered in this chapter take the following generic form: “Does the utility of one variable as a predictor depend on the value of another variable or even of that particular variable itself ?”