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Series Editor's Introduction Preface Chapter 1: Introduction TheConcept of Interaction Simple Effects and Interaction Contrasts SimpleEffects Interaction Contrasts A Review of Multiple Regression TheLinear Model Hierarchical Regression Categorical Predictors and DummyVariables Predicted Values in Multiple Regression Transformations ofthe Predictor Variables Overview of Book Chapter 2: Two-Way InteractionsRegression Models with Product Terms Two Continuous Predictors TheTraditional Regression Strategy The Form of the InteractionInterpreting the Regression Coefficients for the Product Term Interpretingthe Regression Coefficients for the Component Terms Significance Tests andConfidence Intervals Multicollinearity Strength of the InteractionEffect A Numerical Example Graphical Presentation A QualitativePredictor and a Continuous Predictor A Qualitative Moderator Variable AContinuous Moderator Variable More Than Two Groups for the QualitativeVariable Form of the Interaction Summary Chapter 3: Three-WayInteractions Three Continuous Predictors Qualitative and ContinuousPredictors A Continuous Focal Independent Variable A Qualitative FocalIndependent Variable Qualitative Variables with More than Two LevelsSummary Chapter 4: Additional Considerations Selected Issues TheBiLinear Nature of Interactions for Continuous Variables CalculatingCoefficients of Focal Independent Variables at Different Moderator ValuesPartialing the Component Terms Transformations Multiple InteractionEffects Standardized and Unstandardized Coefficients Metric PropertiesMeasurement Error Robust Analyses and Assumption ViolationsWithin-Subject and Repeated-Measure Designs Ordinal and DisordinalInteractions Regions of Significance Confounded Interactions OptimalExperimental Designs and Statistical Power Covariates Control forExperimentwise Errors Omnibus Tests and Interaction Effects Some CommonMisapplications Interaction Models with Clustered Data and RandomCoefficient Models Continuous Versus Discrete Predictor Variables TheModerator Framework Revisited References Notes About the Authors