# Percentage Base

Depending on the chart type, the following options are available for the base (denominator) used in percentage calculations. Specifying the percentage base is not available for cumulative percentages. The base for cumulative percentages is always the grand total because a different percentage base could conflict with the cumulative percentage.

**Grand Total.** Percentages are based on the total number of cases or responses
in the chart. Adding up all of the graphic elements across all panels
in the chart equals 100%.

**Total for Each
Axis Category.** Percentages are based on the total number
of cases or responses in a particular axis category. Adding up the
graphic elements in the category equals 100%. This is the percentage
base that you would select so that each stack or each cluster adds
up to 100%.

**Total for Each
Legend Variable Category.** Percentages are based on the
total number of cases or responses with the same color, pattern, or
other aesthetic. Adding up the graphic elements with the same aesthetic
equals 100%. For example, adding up all of the green bars in the chart
would equal 100%.

**Total for Each
Panel.** Percentages are based on the total number of cases
or responses in the same panel. Adding up the graphic elements in
each panel equals 100%.