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Quartile Deviation : It is based on the lower quartile and the upper quartile. The difference is called the inter quartile range. The difference divided by is called semi-inter-quartile range or the quartile deviation.Thus. The quartile deviation is a slightly better measure of absolute dispersion than the range.But it ignores the observation on the tails. If we take difference samples from a population and calculate their quartile deviations, their values are quite likely to be sufficiently different.t is based on the lower quartile and the upper quartile. The difference is called the inter quartile range. The difference divided by is called semi-inter-quartile range or the quartile deviation. Thus. The quartile deviation is a slightly better measure of absolute dispersion than the range.
For a set of data the three quartiles are values that divide the data up into four equally-populated groups. So the lower quartile, Q1, is a value such that one quarter of the data have a value below this.The upper quartile, Q3, is a value such that three-quarters of the data have a value below this.or a set of data the three quartiles are values that divide the data up into four equally-populated groups. So the lower quartile, Q1, is a value such that one quarter of the data have a value below this.