Mediation

Time to download athe Process 5.0 macro for R. Get it ** here **. 

Topics

Introduction to regression-based mediation analysis. 

• Theoretical models of X --> M --> Y

• Inconsistent mediation and suppression effects

• Performing Baron and Kenny, the Sobel test, and Preacher & Hayes

• Mediation versus indirect effects -- do we need X --> Y

• Distinguishing between mediation and common cause

• Using the PROCESS macro

Readings

• Baron, R. M., & Kenny, D. A. (1986). The moderator–mediator variable distinction in social psychological research: Conceptual, strategic, and statistical considerations. Journal of personality and social psychology, 51(6), 1173. [pdf]

• Hayes, A. F. (2013).  Introduction to mediation, moderation, and conditional process analysis. New York: The Guilford Press. Chapter 1 [pdf]

• UCLA. Introduction to Mediation Models with the PROCESS Macro in SPSS. (but note silly use of age as mediator)

Handouts

• Kenny handout on testing mediation. [html]

• Kenny. History of mediation analysis

• Variety of PROCESS models

• Using the PrOCESS mediation model in R

Optional Readings

• Zhao, Lynch, and Chen (JCR 2010) -- Reconsidering Baron and Kenny: Myths and Truths About Mediation Analysis [^pdf]

• effect size

• Hayes, Andrew F.. Introduction to Mediation, Moderation, and Conditional Process Analysis: A Regression-Based Approach (Methodology in the Social Sciences Series) (p. 252). Guilford Publications. Kindle Edition. [this is a really good book]

Datasets

• pmi

• estress

Class notes

• Notes | Regression & Mediation