Definition:Interquartile Range

Definition

The interquartile range is a measure of dispersion in statistics.

Let $Q_1$ and $Q_3$ be first quartile and third quartile respectively.

The interquartile range is defined and denoted as:

$\operatorname {IQR} := Q_3 - Q_1$

Also see

• Results about interquartile ranges can be found here.

Sources

• 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): interquartile range
• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): interquartile range
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): interquartile range
• 2011: Charles Henry Brase and Corrinne Pellillo Brase: Understandable Statistics (10th ed.): $\S 3.3$
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): interquartile range