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decile

[des-il, -ahyl] /ˈdɛs ɪl, -aɪl/
noun, Statistics.
1.
one of the values of a variable that divides the distribution of the variable into ten groups having equal frequencies.
Origin
1880-1885
1880-85; dec- + -ile
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for decile
  • Here's their table showing a breakdown of taxes by income decile.
  • Income effects on the top decile are statistically insignificant.
  • How about the ratio of these expenditures per household plotted against total income, broken down by decile.
  • Data that are viewed at the decile level may hide considerable variation in households' burdens within deciles.
British Dictionary definitions for decile

decile

/ˈdɛsɪl; -aɪl/
noun
1.
(statistics)
  1. one of nine actual or notional values of a variable dividing its distribution into ten groups with equal frequencies: the ninth decile is the value below which 90% of the population lie See also percentile
  2. a tenth part of a distribution
Word Origin
C17: from deca- + -ile
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for decile
adj.

1670s in astrology; 1882 in statistics; from French décile or Medieval Latin *decilis, from Latin decem "ten" (see ten) on the model of quintilis, sextilis.

Online Etymology Dictionary, © 2010 Douglas Harper
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