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Glossary 4.6 Glossary
- percentile rank.
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The percentage of values in a distribution that are less than or equal to a given quantity.
- percentile.
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The value in a distribution associated with a given percentile rank.
- cumulative distribution function (CDF).
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A function that maps a value to the proportion of the distribution less than or equal to that value.
- quantile.
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The value in a distribution that is greater than or equal to a given proportion of values.
- robust.
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A statistic is robust if it is less affected by extreme values or outliers.
- interquartile range (IQR).
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The difference between the 75th and 25th percentiles, used to measure the spread of a distribution.
