# Name of a “normalized” second moment

I am asking myself how this second moment would be referred to in English:

$$\frac{E(X^2)} {(EX)^2}$$

I would have called it standardized for instance, but for example Wikipedia refers to standardized moments as something different. Sorry, not a native speaker...

• Wikipedia also says $\frac{E(X^2)} {(EX)^2}-1 =\frac{\sigma^2}{\mu^2}$ is sometimes called the efficiency – Henry Mar 26 at 1:06
• What do you do if $E(X)=0$? – Gerry Myerson Mar 26 at 1:52
• @GerryMyerson let's rule that case out – MATHX Mar 26 at 13:52