Plural of decile; multiple values that divide a data distribution into ten equal parts, used in statistical analysis.
Regular plural of 'decile,' formed by adding '-s.' The term's origin traces to Latin and French statistical vocabulary developed in the early 20th century.
Economists love deciles because they can say '90% of wealth is held by the top decile' more dramatically than saying '90th percentile'—it makes inequality sound sharper and more absolute. The math is identical; the word choice just changes the emotional impact.
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