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coefficient of variation

noun
1.
(statistics) a measure of the relative variation of distribution independent of the units of measurement; the standard deviation divided by the mean, sometimes expressed as a percentage
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Contemporary definitions for coefficient of variation
noun

a statistical measure of investment risk in which risk is defined as the standard deviation per unit of expected return; the ratio of standard deviation to the mean

Examples

There is an equivalent definition for the coefficient of variation of a population, which is based on the expected value and the standard deviation of a random variable.

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