# Summary

- 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.