Measures of Dispersion Midsem Revision

8/18/2019 Measures of Dispersion Midsem Revision

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Measures of Dispersion

• Dispersion (also known as Scatter, Spread,or Variation) measures the extent to whichthe items vary from some central value. Itmay e noted that the measures of

dispersion measure only the de!ree ( i.e. "he amount of variation) ut not thedirection of variation.

• "he measures of dispersion are also calledavera!es of the second order ecause thesemeasures !ive an avera!e of the di#erencesof various items from an avera!e.


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Mean Deviation

• Mean Deviation is the $rithmetic mean ofthe asolute deviations (ie. Deviationstreated as positive re!ardless of their

actual si!ns) of all items of thedistriution from a measure of centraltendency, which could e mean, medianor sometimes even mode. It is also

known as %rst moment of dispersion.Mean deviation aout the median is theleast.


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Documents

Measures of Dispersion Midsem Revision