摘要: … Antoniak [3] derived the Ewens sampling formula fro Blackwell-MacQueen description of sampling from a Dirichlet prior. [35, 37] used the urn scheme to derive the simple form of the size-biased dom permutation of the PD distribution, which Ewens [24] termed th distribution, after Griffiths, Engen and McCloskey, who contributed development and application in the fields of genetics and ecology. Dir random measures and the PD and GEM distributions appear also as th tionary distributions of measure-valued diffusions derived from pop genetics models …