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interquartile range

American  
[in-ter-kwawr-tahyl, -til] / ˌɪn tərˈkwɔr taɪl, -tɪl /

noun

Statistics.

  1. the range of values of a frequency distribution between the first and third quartiles.

interquartile range British  
/ ˌɪntəˈkwɔːtaɪl /

noun

  1. statistics the difference between the value of a variable below which lie 25 per cent of the population, and that below which lie 75 per cent: a measure of the spread of the distribution

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of interquartile range

First recorded in 1880–85; inter- + quartile

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The interquartile range is a number that indicates the spread of the middle half, or the middle 50 percent of the data.

From Textbooks • Mar. 27, 2020

The interquartile range, or IQR, is the range of the middle 50 percent of the data values.

From Textbooks • Sep. 19, 2013

What is the interquartile range for this data?

From Textbooks • Sep. 19, 2013

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.