Interaction Effects in Multiple Regression

Series Editor's Introduction Preface Chapter 1: Introduction The Concept of Interaction Simple Effects and Interaction Contrasts Simple Effects Interaction Contrasts A Review of Multiple Regression The Linear Model Hierarchical Regression Categorical Predictors and Dummy Variables Predicted Values in Multiple Regression Transformations of the Predictor Variables Overview of Book Chapter 2: Two-Way Interactions Regression Models with Product Terms Two Continuous Predictors The Traditional Regression Strategy The Form of the Interaction Interpreting the Regression Coefficients for the Product Term Interpreting the Regression Coefficients for the Component Terms Significance Tests and Confidence Intervals Multicollinearity Strength of the Interaction Effect A Numerical Example Graphical Presentation A Qualitative Predictor and a Continuous Predictor A Qualitative Moderator Variable A Continuous Moderator Variable More Than Two Groups for the Qualitative Variable Form of the Interaction Summary Chapter 3: Three-Way Interactions Three Continuous Predictors Qualitative and Continuous Predictors A Continuous Focal Independent Variable A Qualitative Focal Independent Variable Qualitative Variables with More than Two Levels Summary Chapter 4: Additional Considerations Selected Issues The BiLinear Nature of Interactions for Continuous Variables Calculating Coefficients of Focal Independent Variables at Different Moderator Values Partialing the Component Terms Transformations Multiple Interaction Effects Standardized and Unstandardized Coefficients Metric Properties Measurement Error Robust Analyses and Assumption Violations Within-Subject and Repeated-Measure Designs Ordinal and Disordinal Interactions Regions of Significance Confounded Interactions Optimal Experimental Designs and Statistical Power Covariates Control for Experimentwise Errors Omnibus Tests and Interaction Effects Some Common Misapplications Interaction Models with Clustered Data and Random Coefficient Models Continuous Versus Discrete Predictor Variables The Moderator Framework Revisited References Notes About the Authors