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Of all the different methods of statistical mapping, the choropleth method has benefited the most from the computerization of maps. The shading or tinting of areas to depict attribute values is now the most common way to map all forms of socioeconomic data, far eclipsing other methods of statistical mapping that were more common in the manual era. The areas mapped may be naturally occurring, as with land cover types, or may be arbitrarily defined by humans, as in the case of states, counties, or census enumeration areas. Often mispronounced as “chloropleth,” the name comes from the Greek choros (place) and plethos (value). This symbolization method is used for both qualitative and quantitative data. In mapping quantitative data, the data are usually classified into categories ...

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