A priori probability

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of an event

The probability of the event, considered in contrast to the conditional probability of the same event under certain additional conditions. The latter is called the a posteriori probability. This terminology is, as a rule, used in connection with the Bayes formula.

How to Cite This Entry:
A priori probability. Yu.V. Prokhorov (originator), Encyclopedia of Mathematics. URL:
This text originally appeared in Encyclopedia of Mathematics - ISBN 1402006098