What is quartile deviation?

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Quartile Deviation (QD)
The quartile deviation is half the difference between the upper and lower quartiles in a distribution. It is a measure of the spread through the middle half of a distribution. It can be useful because it is not influenced by extremely high or extremely low scores. Quartile Deviation is an ordinal statistic and is most often used in conjunction with the median.
why we calculating quartile deviation?
First answer by Monika singh. Last edit by Monika singh. Contributor trust: 4 [recommend contributorrecommended]. Question popularity: 42 [recommend question].

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