interquartile range

English

Noun

interquartile range (plural interquartile ranges, abbreviation IQR)

  1. (statistics) The difference between the first and third quartiles; a robust measure of sample dispersion.
    Synonym: midspread
    Coordinate term: standard deviation
    • 2026 February 1 (last accessed), “Measures of Spread”, in Laerd Statistics‎[1], archived from the original on 5 February 2024:
      A common way of expressing quartiles is as an interquartile range. The interquartile range describes the difference between the third quartile (Q3) and the first quartile (Q1), telling us about the range of the middle half of the scores in the distribution.

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