spss TESTING THE HOMOGENEITY-OF-REGRESSION (SLOPES) ASSUMPTION

spss TESTING THE HOMOGENEITY-OF-REGRESSION (SLOPES) ASSUMPTION

Before we get started – we must first conduct a test of the homogeneity-ofregression (slopes) assumption. To conduct this test, follow these steps:

1. Click Analyze, click General Linear Model, and then click Univariate

2. Click the dependent variable, then click to move it to the Dependent

Variable box

3. Click the independent variable, then click to move it to the Fixed

Factor(s) box

4. Click the covariate, then click to move it to the Covariate(s) box

5 Click Model

6 Click Custom under Specify Model

7. Click the independent variable under Factors & Covariates and click to

make it appear in the Model box

8. Click the covariate under Factors & Covariates and click to make it

appear in the Model box

9. Holding down the Ctrl key, click the independent variable (IV) and the

covariate (Cov) in the Factors & Covariates box. Check to see that the

default option Interaction is specified in the drop-down menu in the Build

Term(s) box. If it is not, select it

10. Click and the IV*Cov should now appear in the Model box

11. Click Continue. This will bring you back to the Univariate screen

12. Click OK

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