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The Coefficient of Standard Deviation or Coefficient of Variation is a relative measure of dispersion given by Coefficient of Standard Deviation = (Standard Deviation)/ ( Mean )* 100 = σ / x ̄ * 100 It’s a pure number and can be used to compare the variability of 2 distributions expressed in different units. It is mainly used to compare measurements that use different units or when means are vastly different.