Good question, Andrew. I’ll let others weigh in with more detail, but the info on the Qualitative data type found on the Edit Attribute Properties how to guide might be helpful background:
qualitative – numeric data displayed using relative rather than absolute measures. In the example below (attached), the percentage of people in each state with graduate degrees has been converted from a numeric to a qualitative attribute, so the percentages are represented as propotionally sized red bars (the % is highest in DC and lowest in FL) rather than as precise numbers.
