Example of Compare Each Cell with Comparison Letters

This example uses the Consumer Preferences.jmp sample data table, which contains survey data on people’s attitudes and opinions, as well as questions concerning oral hygiene. You explore the distribution of the responses to the statement “I am working on my career” between employee tenure groups.

Select Help > Sample Data Library and open Consumer Preferences.jmp.

Select Analyze > Consumer Research > Categorical.

Select Job Satisfaction and on the Simple tab click Responses.

Select Employee Tenure and click X, Grouping Category.

Click OK.

Click the Categorical red triangle menu and select Compare Each Cell.

Figure 4.12 Compare Each Cell

The p-values for pairwise Pearson Chi-square, likelihood ratio chi-square, and Fisher’s exact tests for independence are provided in tables. The tables are labeled by comparison letters. The comparison letters are shown in the Crosstab table to the right of the group labels. Response rates that differ by groups are indicated with a comparison letter in the Crosstab table cells.

Employees with fewer than 5 years of tenure are somewhat satisfied at a greater rate than those with 20 years of tenure. This finding is noted by the letter d in the Somewhat satisfied cell in the first row of the Crosstab table. In addition, these same employees are Extremely satisfied at a lower rate than group D as noted by the letter a in the Extremely satisfied cell of the last row of the Crosstab table. The letters are placed in the cell with the higher share of responses.