The default vertical axis of a histogram represents the count of values that map to a
particular bucket. To report the histogram as a percentage of a whole, the histogram count is
normalized to add up to 1, and then the bars represent the proportionate frequency.
On the right side of Dashboard Designer, click
Settings in the VISUALmenu.
In the Settings menu, click Basic.
Under Basic, select the Normalized
The following image shows the two versions of the histogram. You can see that the change
appears in the vertical axis and the tooltip, where frequency is reported as a number of
incidents on the upper graph, and as a percentage on the lower graph.