(numeric for y-values, categorical for x-values , repeated for repeated measures )
You can set the X-axis or Y-axis of the current graph by directly clicking on measures in the Measures List. Clicking on a numeric measure selects that measure (it turns purple) and sets the Y-value of the current graph. Clicking and selecting on a categorical measure (it turns green) sets the X-category of the graph. If you hold down the option key when clicking a categorical measure, it sets the subcategory of the graph. You can also change the selections with the keyboard, arrowing up and down the list.