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Measure of Dispersion
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Measure of Dispersion
A measure of dispersion allows to describe a set of data concerning a particular variable, giving an indication of the variability of the values inside the data set. The measure of dispersion completes the description given by the measure of central tendency of a distribution.
If we observe different distributions, we can say that for some of them, all the data are grouped in a more or less short distance from the central value; for others the distance is much greater.
We can class the measures of dispersion into two groups:
- Measures defined by the distance between two representative values of the distribution:
- Range, also called the interval of variation
- Interquartile Range
- Measures calculated depending on deviations of each datum from a central value:
- Geometric deviation
- Median deviation
- Mean absolute deviation
- Standard deviation
Among