The multinomial distribution is a type of probability distribution used in finance to determine the likelihood of a certain set of outcomes.

The COV is equal to the ratio between the standard deviation and the mean. Although COV is most commonly used in comparing relative risk, it may be applied to many types of probability distribution.

NANNY WERMUTH, Probability distributions with summary graph structure, Bernoulli, Vol. 17, No. 3 (August 2011), pp. 845-879 ...

Aldous and Shepp recently proved that the Erlang distribution of a given order is the least variable phase-type distribution of that order, in the sense of minimizing the coefficient of variation.