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  • A measure of dispersion clears the behaviour of an economic variable.
  • Range and Quartile Deviation are based upon the spread of values.
  • M.D. and S.D. are based upon deviations of values from the average.
  • Measures of dispersion could be Absolute or Relative.
  • Absolute measures give the answer in the units in which data are expressed.
  • Relative measures are free from these units, and consequently can be used to compare different variables.
  • A graphic method, which estimates the dispersion from shape of a curve, is called Lorenz Curve.

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