Description
Written in a friendly, conversational style, this book offers a hands-on approach to statistical mediation and moderation for both beginning researchers and those familiar with modeling. Starting with a gentle review of regression-based analysis, Paul Jose covers basic mediation and moderation techniques before moving on to advanced topics in multilevel modeling, structural equation modeling, and hybrid combinations, such as moderated mediation. User-friendly features include numerous graphs and carefully worked-through examples; "Helpful Suggestions" about procedures and pitfalls; "Knowledge Boxes" delving into special topics, such as dummy coding; and end-of-chapter exercises and problems (with answers). The companion website (www.guilford.com/jose-materials) provides downloadable data and syntax files for the book's examples and exercises, as well as links to Jose's online programs, MedGraph and ModGraph. Appendices present SPSS, Amos, and Mplus syntax for conducting the key types of analyses.
Chapter
Confusions about Mediation and Moderation
Mediation and Moderation: The Synergism of Three Variables
The History of Mediation and Moderation
Two Strands of Thought within Statistics
The Historical Basis for the Methods of Mediation and Moderation
Baron and Kenny’s Landmark Publication
Knowledge Box. A Note about Terminology: IV/DV versus Predictor/Outcome
Clarification of Mediation and Moderation Subsequent to Baron and Kenny’s Article
Review of Basic Rules for Mediation
How to Do Basic Mediation
Knowledge Box. Controversy: Calculation of Whether Significant Mediation Has Occurred
An Example of Mediation with Experimental Data
An Example of Null Mediation
Sobel’s z versus Reduction of the Basic Relationship
Suppressor Variables in Mediation
Investigating Mediation When One Has a Nonsignificant Correlation
Understanding the Mathematical “Fine Print”: Variances and Covariances
Discussion of Partial and Semipartial Correlations
4. Special Topics in Mediation
Model Specification: Testing Models
Knowledge Box. Another Area of Potential Confusion: Implications for Naming Different Types of Mediation Results
Bootstrapping (Resampling)
Longitudinal Mediation Models
Multilevel Mediation Models
Categorical Mediators and/or Outcomes (Logistic Mediation)
Mediation with Quadratic Relationships
Categorical Variable Moderation
Knowledge Box. A Short Tutorial on Dummy Coding
An Example of a Continuous Moderator
Knowledge Box. Graphing Moderation Patterns
6. Special Topics in Moderation
Johnson–Neyman Regions of Significance
Multiple Moderator Regression Analyses
Moderation of Residualized Relationships
Basic Moderation in Path Analyses
Moderation in Multilevel Modeling (MLM)
Moderation with Latent Variables
7. Mediated Moderation and Moderated Mediation
Mediated Moderation: A Baron and Kenny-Type Example
Where to from Here?: Bootstrapping for Moderated Mediation
More Complicated Variants: Moderated Mediated Moderation
Suggested Answers to Exercises
Appendix A. SPSS, Amos, and Mplus Models
Appendix B. Resources for Researchers Who Use Mediation and Moderation