A quartile deviation is defined by
 |
where 
and 
are the first and third quartiles and 
is the interquartile
range.
Quartile Deviation
See also
Interquartile Range, Quartile, Quartile Variation CoefficientExplore with Wolfram|Alpha
References
Kenney, J. F. and Keeping, E. S. Mathematics of Statistics, Pt. 1, 3rd ed. Princeton, NJ: Van Nostrand, p. 36, 1962.Referenced on Wolfram|Alpha
Quartile DeviationCite this as:
Weisstein, Eric W. "Quartile Deviation." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/QuartileDeviation.html