IEVref: 171-07-17 ID: Language: en Status: Standard Term: relative entropy Synonym1: Synonym2: Synonym3: Symbol: Hr Definition: ratio of the entropy H to the decision content H0 Hr =  H/H0EXAMPLE Let $\left\{a,b,c\right\}$ be a set of three events and let $p\left(a\right)=0,5$, $p\left(b\right)=0,25$ and $p\left(c\right)=0,25$ be the probabilities of their occurrences. The relative entropy of this set is: ${H}_{\text{r}}=1,5\mathrm{Sh}/1,585\text{\hspace{0.17em}}\mathrm{Sh}\approx 0,95$. Publication date: 2019-03-29 Source: IEC 80000-13:2008, 13-27, modified – Addition of information useful for the context of the IEV, and adaptation to the IEV rules Replaces: Internal notes: CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: