H-Spread

The difference $H_2-H_1$, where $H_1$ and $H_2$ are Hinges. It is the same as the Interquartile Range for $N=5$, 9, 13, ... points.

See also Hinge, Interquartile Range, Step

References

Tukey, J. W. Explanatory Data Analysis. Reading, MA: Addison-Wesley, p. 44, 1977.