What is quartile deviation - Definition and Meaning

Quartile Deviation :

In a distribution, partial variance between the upper quartile and lower quartile is known as 'quartile deviation'. Quartile Deviation is often regarded as semi inter quartile range.

Formula :

(Upper quartile- lower quartile) / 2

Example :

upper quartile = 400, lower quartile = 200 then
Quartile deviation (QD) = (400-200)/2 = 200/2 =100.
Quintic Equation Q factor

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