Base SAS 9.1 Procedures Guide, Volumes 1, 2, 3 and 4

The following are variable characteristics for the CHART procedure:

• Character variables and formats cannot exceed a length of 16.

• For continuous numeric variables, PROC CHART automatically selects display intervals, although you can explicitly define interval midpoints.

• For character variables and discrete numeric variables, which contain several distinct values rather than a continuous range, the data values themselves define the intervals.