Unclassed choropleth maps are looked at by the majority of cartographers skeptically, because they do not have any data sets to really rely on. Color shadings are used to classify the data, and this is done in proportion to the data values. A color therefore represents a certain data value or range, but there is really no other indicator or clue that helps us in determining what that value actually is. Therefore, unclassed choropleth maps are generally avoided.
This unclassed choropleth map shows the proportion of children ages 0-15. Five unknown classes are used, based on an equal bin interval classification scheme.
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