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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.
Quartile deviation is one of the important measure of variation. The semi-interquartile range is a measure of dispersion. It is computed as one half the difference between the 75th percentile (Q 3) and the 25th percentile (Q 1). Semi-interquartile range is one-half the difference between the first and third quartiles.It is half the distance needed to cover half the scores.Semi interquartile range also be defined as half of the interquartile range. The Formula for Semi Interquartile RangeSemi Interquartile Range = $\frac{Q_3 - Q_1}{2}$.t is computed as one half the difference between the 75th percentile (Q 3) and the 25th percentile (Q 1). Semi-interquartile range is one-half the difference between the first and third quartiles. It is half the distance needed to cover half the scores.