A measure of spread. Inter-quartile range, or midspread. This covers the middle 50% of a distribution - the area between the 25th and 75th percentiles, which it calculates using the quantile function. You can opt to remove NA values.
R Example
Get the IQR of the rivers dataset (part of the datasets package).
> IQR(rivers)
[1] 370
In the rivers dataset, the 75% value minus the 25% value is 370. You prove this using fivenum:
> fivenum(rivers)
[1] 135 310 425 680 3710
680 - 310 == 370.
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