Step by step Manual for Moderation Analysis in SPSS

Manual
Moderation Analysis

The moderator variable is one that affects the relationship between two others: the strength

or direction of the relationship between the two vars is affected by the moderator

(moderation is the same as the interaction effect in ANOVA).



1. Draw a conceptual model

2. Look at the nature of the moderator:

1. If it’s categorical > interaction effect in ANOVA

2. If it’s continuous > use PROCESS

3. Check assumptions by running a multiple regression analysis

1. For the IVs, you include the IV, moderator and interaction term you create yourself
under compute (IV*Mod) as independent variables (predictors) in one block.

2. Include the DV as a DV

3. Check output for assumptions

1. Cook’s distance

2. Centered leverage value

3. Mahalanobis distance

4. Residuals

5. Multicollinearity

6. Normality of residuals

7. Durbin-Watson

8. Heteroscedasticity

9. Linearity

10. Bootstrap in PROCESS when not all assumptions are met.

4. Analyze > Regression > PROCESS

1. Outcome variable to Y

2. Predictor variable to X