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      Estimating the number of species in a stochastic abundance model.

      1 ,
      Biometrics
      Wiley

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          Abstract

          Consider a stochastic abundance model in which the species arrive in the sample according to independent Poisson processes, where the abundance parameters of the processes follow a gamma distribution. We propose a new estimator of the number of species for this model. The estimator takes the form of the number of duplicated species (i.e., species represented by two or more individuals) divided by an estimated duplication fraction. The duplication fraction is estimated from all frequencies including singleton information. The new estimator is closely related to the sample coverage estimator presented by Chao and Lee (1992, Journal of the American Statistical Association 87, 210-217). We illustrate the procedure using the Malayan butterfly data discussed by Fisher, Corbet, and Williams (1943, Journal of Animal Ecology 12, 42-58) and a 1989 Christmas Bird Count dataset collected in Florida, U.S.A. Simulation studies show that this estimator compares well with maximum likelihood estimators (i.e., empirical Bayes estimators from the Bayesian viewpoint) for which an iterative numerical procedure is needed and may be infeasible.

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          Author and article information

          Journal
          Biometrics
          Biometrics
          Wiley
          0006-341X
          0006-341X
          Sep 2002
          : 58
          : 3
          Affiliations
          [1 ] Institute of Statistics, National Tsing Hua University, Hsin-Chu, Taiwan. chao@stat.nthu.edu.tw
          Article
          10.1111/j.0006-341x.2002.00531.x
          12229987
          677cc7da-8ab0-436c-8253-e9ed9417413e
          History

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