Editing Coefficient of variation (section)

== Similar ratios ==
[[Standardized moment]]s are similar ratios, <math>{\mu_k}/{\sigma^k}</math> where <math>\mu_k</math> is the ''k''<sup>th</sup> moment about the mean, which are also dimensionless and scale invariant. The [[variance-to-mean ratio]], <math>\sigma^2/\mu</math>, is another similar ratio, but is not dimensionless, and hence not scale invariant. See [[Normalization (statistics)]] for further ratios.

In [[signal processing]], particularly [[image processing]], the [[Multiplicative inverse|reciprocal]] ratio <math>\mu/\sigma</math> (or its square) is referred to as the [[signal-to-noise ratio]] in general and [[signal-to-noise ratio (imaging)]] in particular.

Other related ratios include:
* [[Efficiency (statistics)#Estimators of u.i.d. Variables|Efficiency]], <math>\sigma^2 / \mu^2</math>
* [[Standardized moment]], <math>\mu_k/\sigma^k</math>
* [[Variance-to-mean ratio]] (or relative variance), <math>\sigma^2/\mu</math>
* [[Fano factor]], <math>\sigma^2_W/\mu_W</math> (windowed VMR)