Example of User-Specified Comparison with Comparison Letters
Use the Categorical platform to test the independence of specified combinations of a response and a grouping variable.
1. Select Help > Sample Data Folder and open Consumer Preferences.jmp.
2. Select Analyze > Consumer Research > Categorical.
3. Select I am working on my career and click Responses on the Simple tab.
4. Select Employee Tenure and click X, Grouping Category.
5. Click OK.
6. Click the red triangle next to I am working on my career By Employee Tenure and select Show Letters.
7. Click the red triangle next to I am working on my career By Employee Tenure and select Specify Comparison Groups.
8. Enter A/B, B/C, C/D and click OK.
9. Click the Categorical red triangle and select Test Response Homogeneity.
Figure 3.28 Specify Comparison Example
The test of response homogeneity compares Group A to Group B, Group B to Group C, and Group C to Group D. Group B (5 to 10 years) respondents agree with the statement “I am working on my career” more often than those in Group C (10 to 20 years). The Pearson p-value for this difference in agreement rates is 0.0136.