beta-distribution是dirichlet distribution的特殊情况.贝叶斯统计的后验分布。
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 αi − 1 times.
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 αi − 1 times.
http://www.cs.cmu.edu/~jrs/sins.html
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