
334 15 Graph Platforms The Chart Report
If there are multiple statistics, the Overlay option is checked by default, and the Y variables (statistics)
are plotted on the same chart for each level of the grouping variable. However, the levels of the group-
ing variable cannot be overlaid into the same plot frame. For example, if the levels of your grouping
variable are Male and Female, the
Overlay option cannot be used to combine the two Male and Female
graphs into one graph. To see that type of result, use
Categories, X, Levels instead of Grouping vari-
ables.
Adding Error Bars
Error bars are available when the Mean statistic is selected for at least ...