The Classification of Coordinate Axis
Category Axis: a nonnumeric axis indicates category basis for displayed data.
Value Axis: a numeric axis indicates numerical magnitude of series values. A non-combination chart only has one main value axis; and a combination chart can define a secondary value axis as required.
As the Category Axis, a good tool for data analysis, consists of non-numeric data and the Value Axis numeric data, these two kinds of coordinate axis have different attributes. In this section, we will introduce such different attributes.