摘要
基于数据删除方法研究了半参数ZI(zero-inflated)负二项回归模型的全局影响问题.得到了数据删除下参数估计的一阶近似,同时得到了广义Cook距离、WK统计量、似然距离及其一阶近似.最后通过随机模拟说明了所得诊断统计量的有效性.
Based on case deletion model(CDM),global influence diagnostics for semi-parametric ZINB regression models is discussesed,and the one-step approximations of the estimates are obtained.At the same time,generalized Cook's distance,WK measures and likelihood distance are given.Finally,the effectiveness of statistics obtained in this paper is investigated through simulations.
出处
《宁夏大学学报(自然科学版)》
CAS
北大核心
2010年第2期116-120,共5页
Journal of Ningxia University(Natural Science Edition)
基金
国家自然科学基金资助项目(10671032)
关键词
ZI负二项回归
数据删除
半参数回归
惩罚似然
模拟研究
ZINB regression
case deletion
semi-parametric regression
penalized likelihood
simulation study