Mediator vs. Moderator Relationships - PowerPoint PPT Presentation

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Mediator vs. Moderator Relationships

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    1. Mediator vs. Moderator Relationships

    2. Moderator A third variable that effects the direction or strength of the relationship between 2 other variables Moderators can be continuous or categorical variables

    3. Moderator A moderator is represented by an interaction When a relationship between two variables holds only at certain levels of the third variable (moderator)

    4. Moderator Examples of Moderator Variables Sex (certain relationships hold in one sex but not the other) - sex moderates the relationship between analgesics and pain report SES - level of SES moderates the relationship between compliance and treatment outcome

    5. Moderator Statistical Approaches ANOVA interaction effects Regression product vectors (interaction) Categorize moderator variable and test for differences in regression coefficients at each level

    6. Moderator

    7. Mediator A third variable intervenes between a predictor and predicted variable The mediator variable may explain why two variables are related Stimulus - Organism - Response the Organism mediates the relationship between a stimulus and behavior

    8. Mediator

    9. Mediator Conditions for Mediation 1. Depression predicts pain 2. depression predicts catastrophizing 3. when depression/cat relationship and cat/pain relationship controlled, Depression/pain relationship is reduced or eliminated

    10. Mediator Statistical Approach Regression could run three separate regressions hierarchical regression LISREL

    11. Mediator