Example of User-Specified Comparison with Comparison Letters
This example uses the Consumer Preferences.jmp sample data table. This table contains survey data about people’s attitudes and opinions. You define specific comparison groups across which to compare the responses to the statement “I am working on my career”.
1. Select Help > Sample Data Library 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.