期刊
ANNALS OF APPLIED PROBABILITY
卷 23, 期 5, 页码 1721-1754出版社
INST MATHEMATICAL STATISTICS
DOI: 10.1214/12-AAP843
关键词
Bayesian nonparametrics; Exchangeable random partitions; Gibbs-type random partitions; sampling formulae; small blocks; species sampling problems; sigma-diversity
资金
- European Research Council (ERC) through StG N-BNP [306406]
Gibbs-type random probability measures and the exchangeable random partitions they induce represent an important framework both from a theoretical and applied point of view. In the present paper, motivated by species sampling problems, we investigate some properties concerning the conditional distribution of the number of blocks with a certain frequency generated by Gibbs-type random partitions. The general results are then specialized to three noteworthy examples yielding completely explicit expressions of their distributions, moments and asymptotic behaviors. Such expressions can be interpreted as Bayesian nonparametric estimators of the rare species variety and their performance is tested on some real genomic data.
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