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Posterior analysis of rare variants in Gibbs-type species sampling models

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  • Cesari, Oriana
  • Favaro, Stefano
  • Nipoti, Bernardo

Abstract

Species sampling problems have a long history in ecological and biological studies and a number of statistical issues, including the evaluation of species richness, are still to be addressed. In this paper, motivated by Bayesian nonparametric inference for species sampling problems, we consider the practically important and technically challenging issue of developing a comprehensive posterior analysis of the so-called rare variants, namely those species with frequency less than or equal to a given abundance threshold. In particular, by adopting a Gibbs-type prior, we provide an explicit expression for the posterior joint distribution of the frequency counts of the rare variants, and we investigate some of its statistical properties. The proposed results are illustrated by means of two novel applications to a benchmark genomic dataset.

Suggested Citation

  • Cesari, Oriana & Favaro, Stefano & Nipoti, Bernardo, 2014. "Posterior analysis of rare variants in Gibbs-type species sampling models," Journal of Multivariate Analysis, Elsevier, vol. 131(C), pages 79-98.
    • Handle: RePEc:eee:jmvana:v:131:y:2014:i:c:p:79-98
    DOI: 10.1016/j.jmva.2014.06.017
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    References listed on IDEAS

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