Estimate Difference of Proportions

 

If you need an estimate of the difference between the proportion of cases having a given value for a categorical attribute as compared to the proportion in another group, choose Estimate Parameters from the Analyze menu, then choose Difference of Proportions from the popup.

Enter the relevant statistics or drop attributes into the upper pane.

As shown at right (in "verbose" mode), Fathom computes an estimate at a given confidence level which you can change.

In this test the normal approximation is used. The confidence interval cannot be computed if the number of cases that are in the category or not in the category is less than 5.