Abstract
We consider default Bayesian inference in a Poisson generalized linear mixed model for spatiotemporal data. Normal random effects are used to model the within-area correlation over time, and spatial effects represented with a proper conditional autoregressive (CAR) model are used to model the between-area correlations. We develop a uniform shrinkage prior (USP) for the variance components of the spatiotemporal random effects. We prove that the proposed USP is proper, and the resulting posterior is proper under the proposed USP, an independent flat prior for each fixed effect, and a uniform prior for a spatial parameter, under suitable conditions. Posterior simulation is implemented and inference made using the OpenBUGS, R2OpenBUGS, and RStan software packages. We illustrate the proposed method by applying it to a leptospirosis count dataset with observations from 17 northern provinces of Thailand across four quarters in 2011 to construct the disease maps. According to the deviance information criterion, the proposed USP for the variance components of the spatiotemporal effects yields a better performance than the conventional inverse gamma priors. A simulation study suggests that the estimated fixed-effect parameters are accurate, based on a relative bias criterion. The leptospirosis data analysis indicates that the top ten estimated leptospirosis morbidity rates (per 100,000 population), ranging from the highest to the lowest, are in Nan (Quarter (Q) 3, 9.8060), Chiang Rai (Q3, 3.1010), Nan (Q2, 3.0190), Nan (Q4, 2.2370), Nan (Q1, 2.2330), Phitsanulok (Q3, 2.2240), Lampang (Q3, 1.7890), Uttaradit (Q3, 1.5230), Phrae (Q3, 1.4720), and Phetchabun (Q3, 1.4380) provinces, respectively.
Krisada Lekdee and Chao Yang co-first author.
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Lekdee, K., Yang, C., Ingsrisawang, L., Li, Y. (2021). A Uniform Shrinkage Prior in Spatiotemporal Poisson Models for Count Data. In: Zhao, Y., Chen, (.DG. (eds) Modern Statistical Methods for Health Research. Emerging Topics in Statistics and Biostatistics . Springer, Cham. https://doi.org/10.1007/978-3-030-72437-5_4
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