Performing a 2-way or higher factorial analysis of variance (ANOVA)

Test if there is a difference between population means when a response variable is classified by two or more categorical variables (factors).

1. Select a cell in the dataset.
2. On the Analyse-it ribbon tab, in the Statistical Analyses group, click Fit Model, and then click ANOVA.
   The analysis task pane opens.
3. In the Y drop-down list, select the response variable.
4. In the Available variables list, select the factor variables:
   • To select a single variable, click the variable.
   • To select multiple variables, click the first variable then hold down the CTRL key and click each additional variable.
   • To select a range of variables, click the first variable then hold down the SHIFT key and click the last variable in the range.
5. Click Factorial, and then click Full for a full factorial model, or click the highest order of interaction terms to include in the model.
6. Optional: To sort the terms by order (that is, all simple terms, all two-way interactions, then all three-way interactions...) rather than in the order the variables were added, click Sort.
7. Click Calculate.