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one of several equally-frequent subranges of a data set or random distribution; for example, a percentile or quartile

A set of quantiles is a partition of the range of a random variable or set of data into subranges of equal likelihood or frequency (or approximately equal likelihood or frequency if an equal partition is not possible). An $n$-quantile is one of a set of quantiles that partition the range into $n$ such parts.

Common examples of quantiles are quartiles ($4$-quantiles), quintiles ($5$-quantiles), deciles ($10$-quantiles), percentiles ($100$-quantiles), and the median (a $2$-quantile).

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