10. SPSS Hayes Process Macro - Model 8 - Moderated Mediation

Moderated mediation in PROCESS Model 8 shows how role ambiguity changes not only the direct link between organizational commitment and outcomes, but also the strength of the indirect pathway through organizational learning. In this setup, organizational commitment predicts organizational learning, organizational learning predicts organizational performance, and role ambiguity (the moderator) alters key effects—ultimately determining when the commitment-to-performance mechanism is stronger or weaker.

The analysis is run in SPSS using PROCESS macro Model 8, with organizational performance as the dependent variable, organizational commitment as the independent variable, organizational learning as the mediator, and role ambiguity as the moderator. The model also allows the moderator to influence the direct effect from organizational commitment to organizational performance (the “moderated direct effect” feature that distinguishes Model 8 from Model 7). All variables are treated as continuous, and interaction visualization uses mean-centered values with low, average, and high role ambiguity.

Results begin with the model summary for the mediator equation (organizational learning). Organizational commitment has a significant impact on organizational learning. Role ambiguity also significantly affects organizational learning. Most importantly, the interaction between organizational commitment and role ambiguity significantly predicts organizational learning, with the interaction term producing a meaningful change in explained variance (R²). Confidence intervals for the interaction do not include zero, indicating the moderation is statistically reliable. A Johnson–Neyman analysis then pinpoints where the conditional effect of organizational commitment on organizational learning is significant: the moderation holds up to a specific range of role ambiguity values (the conditional effect is significant until a threshold, after which it becomes non-significant).

The interaction is visualized with three lines representing low, average, and high role ambiguity. At low and average role ambiguity, increases in organizational commitment strongly raise organizational learning (steeper gradients). At high role ambiguity, the slope flattens, meaning the commitment-to-learning relationship weakens—organizational commitment no longer translates into organizational learning as effectively when role ambiguity is high.

For the direct-outcome equation (organizational performance), role ambiguity and organizational learning both show significant effects on organizational performance, and organizational commitment also significantly predicts organizational performance. However, the interaction term (organizational commitment × role ambiguity) is not significant, with confidence intervals indicating the added interaction does not meaningfully change the direct effect. In practical terms: role ambiguity does not moderate the direct path from organizational commitment to organizational performance.

The moderated mediation question turns on whether role ambiguity changes the indirect effect of organizational commitment on organizational performance through organizational learning. Conditional indirect effects are significant at low, average, and high role ambiguity, but the indirect effect is strongest when role ambiguity is low and weaker as role ambiguity rises. The key test is the index of moderated mediation: role ambiguity significantly moderates the indirect effect, confirmed by a bootstrap confidence interval that excludes zero. The final conclusion is that role ambiguity weakens the indirect mechanism (commitment → learning → performance) even though it does not alter the direct commitment → performance link.