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- W2267628043 abstract "In recent years, a large international effort have been placed in compiling a complete list of Antarctic mollusc distributional records based both on historical occurrences, dating back to 1899, and on newly collected data. Such dataset is highly asymmetrical in the quality of contained information, due to a variety of sampling gears used and the amount of information recorded at each sampling station (e.g. sampling gear used, sieve mesh size used, etc.). This dataset stimulates to deploy all statistical potential in terms of data representation, estimation, clusterization and prediction. In this paper we aim at selecting an appropriate statistical model for this dataset. Given their counting nature, we preliminary implement a Poisson regression model and we extend it with a Negative Binomial regression to manage over-dispersion. Generalized linear mixed models (GLMM) and gen- eralized additive models (GAM) are also explored to capture a possible extra explicative power of the covariates. However, preliminary results under them suggest that more sophisticated models are needed. Therefore, we introduce a hierarchical Bayesian model, involving a nonparametric approach through the assumption of random effects with a Dirichlet Process prior." @default.
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- W2267628043 date "2015-05-11" @default.
- W2267628043 modified "2023-10-16" @default.
- W2267628043 title "Statistical models for species richness in the Ross Sea" @default.
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