In statistics, a value that divides a distribution into equal parts; similar to percentile or quartile, representing a point where a certain fraction of the data falls below.
From Latin 'fractus' (broken) with the suffix '-ile' (meaning 'tending to' or 'relating to'), coined in statistical terminology to describe how data is broken into fractional parts.
Fractiles sound abstract, but they're secretly everywhere—the 50th fractile is the median, the 25th fractile is the bottom quartile, and weather reports use them constantly when they say 'the wettest 10% of days,' dividing reality into mathematical slices.
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