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1Each of ten equal groups into which a population can be divided according to the distribution of values of a particular variable.
‘the lowest income decile of the population’
‘Individuals who were in the lowest part of the income distribution for more than a decade face gasoline tax burdens nearly twice as high as the burden placed on the top decile of income.’
‘The bottom deciles all lost real income between 1982 and 1998.’
‘In one study based on U.S. data, for example, people in the top decile of the income distribution averaged more than five points higher on a ten-point happiness scale than people in the bottom decile.’
‘Between 1986 and 1998, the families in the bottom five deciles went backwards in terms of real income.’
‘The annual income bias is especially high in the lowest annual income decile, equaling almost 10 percent of income.’
1.1Each of the nine values of the random variable that divide a population into ten such groups.
‘Nine intervals, rather than deciles, were selected so that the expected mean value would be contained in a single central interval.’
Origin
Late 17th century: from French décile, from a medieval Latin derivative of Latin decem ‘ten’.