Statistical maps are used to display the distribution of a certain variable over a geographic area. In these maps each unit is represented by a shading technique or color that represents a value. The statistics shown on the map are expressed as rates, ratios, percentages, or other statistical measures. This is a statistic map of the change in burglaries from 2001 to 2002. It gives the number and the percentage of burglaries of each county.
http://www.denvergov.org/Portals/335/images/SOPA_bur02.jpg
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