LATENT REFERENCES / TAG2
Dirichlet Distribution
Original title: ディリクレ分布
This reference note belongs to Tag2 in Latent References, an archive curated by Keigo Yoshida. Its archive region is Physics. The note preserves its source text and links so that readers can trace the material behind the 3D map.
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The Dirichlet distribution is known as the conjugate prior of the multinomial distribution and, briefly, is a distribution of “how likely each face of a die is to appear.” The multinomial distribution is the “distribution of appearing faces,” while the Dirichlet distribution is the “distribution of the likelihood of faces appearing,” so Bayesian statistics often uses the Dirichlet distribution as the prior for the multinomial distribution.
ディリクレ分布は多項分布の共役事前分布として知られており、一言でいうと「さいころの目の出やすさ」の分布です。 多項分布は「出る目の分布」でディリクレ分布が「目の出やすさの分布」ということで、ベイズ統計では多項分布の事前分布としてディリクレ分布がよく使われます。
Source updated 2023-11-19 · Snapshot 2026-10-08
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