A Bivariate Choropleth map uses a single map to convey the data from two different variables for a given geographic area. In order to distinguish between the two variables different symbols or colors are used to depict each set of data. The example above is a bivariate choropleth map of Illinois from 2006-2010 describing rates of colorectal cancer and mortality rates. The different shades of blue on the graph represent the age-adjusted incidence rates and the circles of varying sizes are used to show the age-adjusted mortality rates per 100,000 population. As you can see from the graph, areas where incidence rates are low (in light blue) are also areas where mortality rates are low.
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