http://blog.revolutionanalytics.com/2009/11/choropleth-map-r-challenge.html
The difference between a classed and unclassed choropleth map is that in a classed choropleth, each color represents a certain data range, while a classed choropleth map has as many hue's as there are data points. In the map below, there is no information about what the map shows, but it is a great example of an unclassed choropleth because you can see at least 15 different shades of magenta on the map, all showing a unique value.
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