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 Please use this identifier to cite or link to this item: `http://ir.lib.ncu.edu.tw/handle/987654321/65475`

 Title: 零過多與過離散個數資料的分析法 Authors: 劉允宸;LIU,YUN-CHEN Contributors: 統計研究所 Keywords: 零過多;過離散的個數資料;零過多廣義卜瓦松分配;零過多負二項分配;強韌概似函數;zero-inflated;over-dispersion;zero-inflated generalized Poisson distribution;zero-inflated negative binomial distribution;robust likelihood function Date: 2014-07-02 Issue Date: 2014-10-15 15:32:35 (UTC+8) Publisher: 國立中央大學 Abstract: 當分析零過多且具過離散的個數資料時，許多文獻建議可使用零過多廣義卜瓦松 (ZIGP) 模型或零過多負二項 (ZINB) 模型。本文研究指出ZIGP 和ZINB兩種模型的參數估計量均不具一致性，故建議以Royall和Tsou (2003) 強韌概似函數方法建立的強韌常態模型配適零過多且具過離散的個數資料。;Zero-inflated generalized Poisson distribution and zero inflated negative binomial distribution are models proposed for analyzing over-dispersed count data with excess zeros. We illustrate that inferences derived from these models are sensitive to model misspecification.Alternatively, we show that one can fix the normal model to accommodate data with the features of interest. The adjusted normal likelihood is asymptotically legitimate so long as the first two moments are correctly specified and that the 3rd and the 4th moments of the true distributions exist. Appears in Collections: [Graduate Institute of Statistics] Electronic Thesis & Dissertation

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