Publications [#258117] of Alan E. Gelfand
search .Papers Published
- Agarwal, DK; Gelfand, AE; Citron-Pousty, S. "Zero-inflated models with application to spatial count data." Environmental and Ecological Statistics 9.4 (December, 2002): 341-355. [doi]
(last updated on 2023/06/01)Abstract:
Count data arises in many contexts. Here our concern is with spatial count data which exhibit an excessive number of zeros. Using the class of zero-inflated count models provides a flexible way to address this problem. Available covariate information suggests formulation of such modeling within a regression framework. We employ zero-inflated Poisson regression models. Spatial association is introduced through suitable random effects yielding a hierarchical model. We propose fitting this model within a Bayesian framework considering issues of posterior propriety, informative prior specification and well-behaved simulation based model fitting. Finally, we illustrate the model fitting with a data set involving counts of isopod nest burrows for 1649 pixels over a portion of the Negev desert in Israel.