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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.
Quartiles are percentiles that divide the data into fourths. A quartile is a number, it is not a range of values. A value can be described as above or below the first quartile, but a value is never in the first quartile. Consider: Check out this five statistical summary for a set of tests scores.uartiles are percentiles that divide the data into fourths. A quartile is a number, it is not a range of values. A value can be described as above or below the first quartile, but a value is never in the first quartile. Consider: Check out this five statistical summary for a set of tests scores.