Stadardized Choropeth Map

http://www.cdc.gov/pcd/issues/2007/oct/07_0091.htm

These maps are used to display areal averages of information that is being obtained from the variables being measures. and therefore can compare areas in different sizes. Essentially all the data is standardized. It generally uses different shades of coloring to represent different aspects of numerical data. This map measures the percentage of individuals living in poverty.