# OLAP Cubes Differences

This dialog box allows you to calculate percentage and arithmetic differences between summary variables or between groups that are defined by a grouping variable. Differences are calculated for all measures that are selected in the OLAP Cubes Statistics dialog box.

**Differences between
Variables.** Calculates differences between pairs of variables.
Summary statistics values for the second variable (the Minus variable)
in each pair are subtracted from summary statistics values for the
first variable in the pair. For percentage differences, the value
of the summary variable for the Minus variable is used as the denominator.
You must select at least two summary variables in the main dialog
box before you can specify differences between variables.

**Differences between
Groups of Cases.** Calculates differences between pairs
of groups defined by a grouping variable. Summary statistics values
for the second category in each pair (the Minus category) are subtracted
from summary statistics values for the first category in the pair.
Percentage differences use the value of the summary statistic for
the Minus category as the denominator. You must select one or more
grouping variables in the main dialog box before you can specify differences
between groups.

Specifying Differences for OLAP Cubes

This feature requires the Statistics Base option.

- From the menus choose:
- Select two or more summary variables or one or more grouping variables.
- Click Differences.