My understanding of choropleth maps that use the quantile method is that they will assign an equal number of items to each bucket (see http://www.ncgia.ucsb.edu/cctp/units/unit47/html/comp_class.html).
A recent map I made with CartoDB generated a map that did not do this. Instead, most items were assigned to one bucket. 
Is CartoDB using a different type of quantile method than what I described?
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