Measures Of Dispersion

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Dispersion is a measure of the scatteredness or variation of the values in a series. It shows how much the items differ from one another and from the central value. For example, two series can have th…

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An average gives only one central value, but it does not show how the items are spread. Two series may have the same average and yet one may have very small variation while the other may have wide var…

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Dispersion is a measurement of the extent to which the individual items vary. This definition focuses on the variation among the items in a series.

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Dispersion is the variation of the items. The definition is short, but it clearly shows that dispersion is about spread or variability in a set of values.

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Dispersion gives a summary measure of spread, just like an average gives a summary of central value. It is called an average of the second order because it summarises deviations and variation in a sin…

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Measures of dispersion help in checking how reliable an average is, comparing variability in different series, controlling variation in areas like quality and health, and supporting other statistical …

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A good measure of dispersion should be simple, clearly defined, easy to calculate, based on all observations, suitable for algebraic treatment, little affected by sampling fluctuation, and not unduly …

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Absolute measures are expressed in the same unit as the data, such as rupees or kilograms. Relative measures are coefficients or percentages and do not depend on the unit of measurement. Relative meas…