Quintile

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Revision as of 16:31, 5 April 2007 by imported>Bruce M. Tindall (big cleanup)
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In descriptive statistics, quintile is the value that divide a frequency distribution into five equal parts, each containing approximately a fifth of the sample distribution.

People also use quintile as a division in a sample. For example, the first quintile is the point with one fifth of the data below it after ranking all the datas. As one can see here, a quintile will contains approximately 1/5 of the datas as the total number of observations is not necessarily divisible by 5.