Box Plot Map

http://support.sas.com/rnd/base/topics/statgraph/proctemplate/a002650843.htm

Above is an example of a Box Plot, although it is a simplified projection of data, it is also vary useful.  This map type is utilized in descriptive statistics, it is one of the easiest ways to depict numerical data through summaries using boxes as shown above.  In close observation, a median amount, highest, lowest, lower and higher value is displayed. Above is attempting to show the distribution of conditional residual by person.