Unclassed choropleth maps

http://candacesmaps.blogspot.com/2010/12/unclassed-choropleth-maps.html

Unclassed choropleth maps are similar to classed choropleth maps, but the main difference between them is that the unclassed choropleth maps do not have an averaged statistic for each color. It allows the data and numerical information to stay connected; which means that the shades of colors are directly proportional to the data. In this map the results from the 2004 presidential election are shown with the redder regions representing Republicans and the bluer regions representing Democrats