n. a formula which correlates the two conditional probabilities, one an antecedent and the other an observed event. Based on the probability theory, one can calculate the probability of event A happening if event B has already occurred, and vice-versa. First formulated by British mathematician Thomas Bayes (1702-1761).

BAYES' THEOREM: "More than being just a mathematical formula, nowadays, the Bayes' Theorem has practical applications in the field of drug testing."

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*PsychologyDictionary.org*, April 7, 2013, https://psychologydictionary.org/bayes-theorem/ (accessed July 10, 2020).