the IQR is the third quartile minus the first quartile.
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interquartile range or mean absolute deviation.
Interquartile range.
Range = maximum - minimum Interquartile range = Value of 75th percentile - value of 25th percentile. The 75th percentile is the value such that 25% of the observations are bigger and 75% are smaller.
If you are talking about statisitics, in a box and whisker graph it is the interquartile range.
The interquartile range :)