Unclassed Chloropleth Map

http://www.princeton.edu/%7Ervdb/JAVA/election2004/purple_america_2004_small.gif

This is an example of the unclassed chloropleth map which uses a special frequency curve that varies intensity from the lowest to the highest values.  It uses different color schemes, colors and shades to illustrate this.  Above we see the red coloration representing the more Republican counties while the blues are the Democrats.