A bivariate choropleth map is a type of choropleth map that compares two variables of data on one map. The two variables can be distinguished using different colors or symbols. By comparing variables together, you can analyze their correlation. The difference between a bivarate map and a bivaraite choropleth map is the choropleth map cannot display data using lines or points. The bivariate choropleth map shown compares the population of Ohio in 1997 with median house values.
http://proceedings.esri.com/library/userconf/proc99/proceed/papers/pap171/p171.htm
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