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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.
The upper quartile (Q3) is the point between the lowest 75% and highest 25% of values. It is also called the 75th percentile. The variance and the standard deviation are measures of the spread of the data around the mean.They summarise how close each observed data value is to the mean value. In datasets with a small spread all values are very close to the mean, resulting in a small variance and standard deviation.he upper quartile (Q3) is the point between the lowest 75% and highest 25% of values. It is also called the 75th percentile. The variance and the standard deviation are measures of the spread of the data around the mean.