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?
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The quartile deviation(QD) is half the difference between the highest and lower quartile in a distribution.
If the result is 1.5 x Inter Quartile Range (or more) above the Upper Quartile or 1.5 x Inter Quartile Range (or more) below the Lower Quartile.
you do work out the upper and lower quartile
values that divide a list of numbers into quaters is called a quartile.
It is the upper quartile minus the lower quartile.
The interquartile range :)