Probabilidad condicional

La probabilidad de "E" si "C"_i ya ha ocurrido está dado por $P(E|C_{i})$.

Bayes's theorem gives the a posteria probability:

$P(C_{i}|E)={\frac {P(C_{i})P(E|C_{i})}{\sum P(C_{j})P(E|C_{j})}}$,

where P(C_i)=a priori probability of C_i