Journal
COMMUNICATIONS IN STATISTICS-THEORY AND METHODS
Volume 34, Issue 11, Pages 2123-2131Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/STA-200066418
Keywords
bootstrap; delta method; Jaccard's index; Maximum Likelihood Estimator; similarity index; species diversity
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There are several indices for measuring the similarity of two populations, including the ratio of the number of shared species to the number of distinct species ( Jaccard's index) and the conditional probability of observing a shared species ( Smith et al., 1996). However, these indices only take into account the number of species and species proportions of shared species. In this article, we propose a new similarity index which includes the species proportions of both the shared and non shared species in each population, and also propose a Nonparametric Maximum Likelihood Estimator ( NPMLE) for this index. Bootstrap and delta methods are used to evaluate the standard errors of the NPMLE. Based on a loss function, we also compare a class of nonparametric estimators for the proposed index in various situations.
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