MEANING
The difference between the 75th and 25th percentiles, spanning the middle half of ordered observations.
Use it for
Name the spread of the central fifty percent of data.Summarize spread when outliers make the full range misleading.
Words that belong together
- calculate the interquartile range
- report median and interquartile range
- interquartile range of scores
On the page
A long upper tail raised the mean, while the interquartile range stayed compact.
Nearby words
Word forms
- Base
- interquartile range
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Usage notes
The IQR is robust to extreme values compared with the full range; it does not describe the distribution’s tails.
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