نتایج جستجو برای: zero inflated models

تعداد نتایج: 1043517  

Journal: :Health 2010
Alok Kumar Dwivedi Sada Nand Dwivedi Suryanarayana Deo Rakesh Shukla Elizabeth Kopras

Clinicians need to predict the number of involved nodes in breast cancer patients in order to ascertain severity, prognosis, and design subsequent treatment. The distribution of involved nodes often displays over-dispersion-a larger variability than expected. Until now, the negative binomial model has been used to describe this distribution assuming that over-dispersion is only due to unobserve...

Journal: :Statistical methods in medical research 2016
Jing Cheng Nancy F Cheng Zijian Guo Steven Gregorich Amid I Ismail Stuart A Gansky

Different conventional and causal approaches have been proposed for mediation analysis to better understand the mechanism of a treatment. Count and zero-inflated count data occur in biomedicine, economics, and social sciences. This paper considers mediation analysis for count and zero-inflated count data under the potential outcome framework with nonlinear models. When there are post-treatment ...

Journal: :Computational Statistics & Data Analysis 2014

2009
Hai Liu Kung-Sik Chan

Zero-inflation problem is very common in ecological studies as well as other areas. Nonparametric regression with zero-inflated data may be studied via the zero-inflated generalized additive model (ZIGAM), which assumes that the zero-inflated responses come from a probabilistic mixture of zero and a regular component whose distribution belongs to the 1-parameter exponential family. With the fur...

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