The data for a bivariate map must be normalized like a regular choropleth map. In this case obesity and physical inactivity are percentages of county population. The data must then be broken into classes. Choropleth maps with more than 9 classes are confusing and hard to read. Data for this map was divided into 3 classes which produced a 9 class bivariate map.
Created by Ray Eslinger in Nassau County Fl.
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