Ӧ�ø���ͳ�� 2009, 25(6) 659-671 DOI:      ISSN: 1001-4268 CN: 31-1256

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Summary of Statistical Analysis for Zero-Inflated Data
Xie Fengchang,Wei Bocheng,Lin Jinguan
Department of Mathematics,Southest University,Department of Mathematics,Nanjing Agricultural University
Abstract: ZI (zero-inflated) data are data with overmuch zeroes.
The ZI data have been commonly encountered in a wide variation of
disciplines, and have been a hot topic since last decade. In this
paper, we first present the actual significance of ZI data via two
examples. Then we demonstrate the general situation and latest
improvement of statistical analysis for zero-inflated data.
Additionally, zero-inflated models, zero-inflated mixed models, and
the estimation methods and some diagnostic problems are surveyed
systematically. The relevant work done by authors in recent years
are also introduced. Finally, several potential topics to be studied
are listed.
Keywords: Zero-inflated data   EM algorithm   random effect models   statistical diagnostics   score test   dispersion parameter   longitudinal data.  
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