http://bigthink.com/strange-maps/308-the-pop-vs-soda-map
A Standardized Choropleth Map is a choropleth map that has been areally averaged, that is, its information has been standardized to some unit- most commonly, area- as opposed to being a total value for an area. This map, which depicts the various generic names for soft drinks per region, was standardized to a percentage of people who use the term per area. Though this is a silly representation of a standardized map, it highlights the ease of use of this type of map, though observations made must be fairly general, as there is no specific numeric information for an area.
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