Unfortunately, the original version of this article [1] contained an error. Equation number two was missing a “–“ (a minus) sign before the sum symbol. The correct equation has been included here. This correction concerns the notation only. All computations using this equation were done correctly.

$$ P{E}_m=-{\displaystyle {\sum}_i{p}_i log\left({p}_i\right)}, $$
(2)