Bayes' postulate

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Noun1.Bayes' postulate - (statistics) the difficulty of applying Bayes' theorem is that the probabilities of the different causes are seldom known, in which case it may be postulated that they are all equal (sometimes known as postulating the equidistribution of ignorance)
statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
posit, postulate - (logic) a proposition that is accepted as true in order to provide a basis for logical reasoning