The Korean Journal of Applied Statistics (응용통계연구)

The Korean Statistical Society (한국통계학회)
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Bayesian Approaches to Zero Inflated Poisson Model

영 과잉 포아송 모형에 대한 베이지안 방법 연구

  • Received : 20110200
  • Accepted : 20110600
  • Published : 2011.08.31
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Abstract

In this paper, we consider Bayesian approaches to zero inflated Poisson model, one of the popular models to analyze zero inflated count data. To generate posterior samples, we deal with a Markov Chain Monte Carlo method using a Gibbs sampler and an exact sampling method using an Inverse Bayes Formula(IBF). Posterior sampling algorithms using two methods are compared, and a convergence checking for a Gibbs sampler is discussed, in particular using posterior samples from IBF sampling. Based on these sampling methods, a real data analysis is performed for Trajan data (Marin et al., 1993) and our results are compared with existing Trajan data analysis. We also discuss model selection issues for Trajan data between the Poisson model and zero inflated Poisson model using various criteria. In addition, we complement the previous work by Rodrigues (2003) via further data analysis using a hierarchical Bayesian model.

본 논문에서는 영 과잉 계수형 자료 분석을 위한 모형중의 하나인 영 과잉 포아송 모형의 베이지안 접근 방법에 대해서 연구한다. 구체적으로는 베이지안 영 과잉 포아송 모형의 적합을 위한 사후 표본을 추출하는데 있어서, 깁스 표집기(Gibbs sampler)를 이용하는 마르코프 연쇄 몬테칼로(MCMC) 방법과 역 베이즈공식(IBF)에 의한 표본추출 방법 두 가지를 고려한다. 이러한 두 가지 사후 표본 추출방법을 비교 설명하고, IBF를 통한 사후표본을 깁스 표집기 사후표본의 수렴성 여부를 확인하는 방식에 대해서도 소개한다. 이를 바탕으로 베이지안 영 과잉 포아송 모형을 Trajan이라는 사과 품종의 발아자료(Trajan data, Marin 등, 1993)에 적용하고 모수에 대한 사후추론을 실시하고 기존의 결과와 비교한다. 또한 주어진 자료에 대하여 영 과잉 포아송 모형이 적합한지에 대한 여부를 여러 가지 모형선택 기준을 통해서 살펴보고, 아울러 기존의 자료 분석 결과 (Rodrigues, 2003)를 보완하기 위하여 계층적 베이지안 모형과 같은 대안에 대해서도 논의해본다.

Keywords

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