A Univariate choropleth map shows us a single variable that is used as data to express information over a broad area of land. A lot of time the variable will be displayed on a map via a color scheme or at least in a form of shading. Many of times these maps are singled out as the "easiest" to read and most easily understood. This particular map show us and estimation of individual that live in poverty. It presents one set of data which is then defined by that particular color scheme.
http://www.cdc.gov/pcd/issues/2007/oct/images/07_0091_02.gif
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