IEVref: 171-07-14 ID: Language: en Status: Standard Term: information content Synonym1: Synonym2: Synonym3: Symbol: I(x) Definition: quantitative measure of information about the occurrence of an event x of definite probability p(x), equal to the logarithm of the reciprocal of this probability $I\left(x\right)=\mathrm{log}\frac{1}{p\left(x\right)}=-\mathrm{log}p\left(x\right)$EXAMPLE 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 information contents of these events are: $I\left(a\right)=\mathrm{lb}\frac{1}{0,50}\mathrm{Sh}=1\text{\hspace{0.17em}}\mathrm{Sh}$, $I\left(b\right)=\mathrm{lb}\frac{1}{0,25}\mathrm{Sh}=2\text{\hspace{0.17em}}\mathrm{Sh}$, $I\left(c\right)=\mathrm{lb}\frac{1}{0,25}\mathrm{Sh}=2\text{\hspace{0.17em}}\mathrm{Sh}$.Note 1 to entry: For a set of equiprobable events, the information content of each event is equal to the decision content of the set. Publication date: 2019-03-29 Source: IEC 80000-13:2008, 13-24, 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: