Is there a standard definition of the **Relative Variance**? [Wikipedia][1] defines it as the square of the [coefficient of variation][2], but some [articles][3] define it as the variance divided by the absolute value of the mean. I tend to like Wikipedia's definition best, because it is nondimensional.

$RV = \frac{\frac{1}{n} \sum\limits_{i=1}^n (x_i - \overline{x})^2}{\overline{x}^2} = \frac{\sigma^2}{\overline{x}^2}$


  [1]: https://en.wikipedia.org/wiki/Relative_standard_deviation
  [2]: https://en.wikipedia.org/wiki/Coefficient_of_variation
  [3]: http://www.itl.nist.gov/div898/software/dataplot/refman2/ch2/rel_var.pdf