How to group categories on the x-axis
Figure 15‑1
n In Type, select Text, Numeric, or DateTime. If you select DateTime, you can specify the units to use to form the groups, such as Minutes.
n In Interval, select a number that represents the size of the groups to create. For example, to group three-row sequences of text data, select 3. To group numeric data in sections of four, select 4.
n In Aggregate Expression, select the function to use to aggregate the data in the group. You can select Average, Sum, Count, Distinct Count, First, Last, Minimum, and Maximum.
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