High Quality Content by WIKIPEDIA articles! In probability and statistics, the Dirichlet distribution, often denoted Dir, is a family of continuous multivariate probability distributions parametrized by the vector of positive reals. It is the multivariate generalization of the beta distribution, and conjugate prior of the categorical distribution and multinomial distribution in Bayesian statistics. That is, its probability density function returns the belief that the probabilities of K rival events are xi given that each event has been observed.

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