Multiple event times in the presence of informative censoring: modeling and analysis by copulas

Motivated by a breast cancer research program, this paper is concerned with the joint survivor function of multiple event times when their observations are subject to informative censoring caused by a terminating event. We formulate the correlation of the multiple event times together with the time to the terminating event by an Archimedean copula to account for the informative censoring. Adapting the widely used two-stage procedure under a copula model, we propose an easy-to-implement pseudo-likelihood based procedure for estimating the model parameters. The approach yields a new estimator for the marginal distribution of a single event time with semicompeting-risks data. We conduct both asymptotics and simulation studies to examine the proposed approach in consistency, efficiency, and robustness. Data from the breast cancer program are employed to illustrate this research.

     

“比较电影”视野下华语电影融合汇流的历史进程分析

运用比较电影、电影文化学等方法,分析20世纪80年代以来两岸三地电影融合汇流的历史进程,旨在为新世纪华语电影的可持续发展提供理论研究的参照。结论认为,未来两岸三地的电影业应超越传统的合作模式,采取一种更高层次创新融合的发展策略,即在产业、文化的深度交融中保持各自原有的核心优势,积极适应新语境中观影群体审美趣味的变化,合力打造更具文化影响力的新华语电影。     

Tests for time series of counts based on the probability-generating function

We propose testing procedures for the hypothesis that a given set of discrete observations may be formulated as a particular time series of counts with a specific conditional law. The new test statistics incorporate the empirical probability-generating function computed from the observations. Special emphasis is given to the popular models of integer autoregression and Poisson autoregression. The asymptotic properties of the proposed test statistics are studied under the null hypothesis as well as under alternatives. A Monte Carlo power study on bootstrap versions of the new methods is included as well as real-data examples.     

腔内电光调制激光系统的混沌模拟

采用数值模拟的方法讨论了带反馈的腔內电光调制激光系统功率输出的分叉和混沌行为,得到了输出功率随控制参数变化的分叉图,和一些定量结果。     

张之洞实业教育观之我见

实业教育观是张之洞教育思想的重要组成部分 ,它是张之洞与外洋抗争思想的直接结果之一。它以创办实业学堂、派遣留学生及倡导理论与实践相结合的教学方法为主旨 ;以培养近代农、工、商业人才 ,推动经济发展为目的 ,在中国近代历史上影响较为深远。     

GMM tests for the Katz family of distributions

Generalized method of moments (GMM) is used to develop tests for discriminating discrete distributions among the two-parameter family of Katz distributions. Relationships involving moments are exploited to obtain identifying and over-identifying restrictions. The asymptotic relative efficiencies of tests based on GMM are analyzed using the local power approach and the approximate Bahadur efficiency. The paper also gives results of Monte Carlo experiments designed to check the validity of the theoretical findings and to shed light on the small sample properties of the proposed tests. Extensions of the results to compound Poisson alternative hypotheses are discussed.     

充分利用土地资源推进县域经济发展

土地资源是人类一切活动的载体,是发展县域经济的基石,是推进县域经济发展的动力.发展县域经济既是贯彻十六大精神的战略要求,又是县域经济发展的客观需求,更是全面建设小康社会的重要举措.因此,必须紧紧抓住充分利用土地资源这个纲,才能有效地推进县域经济尽快进入高速发展的快车道.怎样充分利用土地资源,发展县域经济,本文提出几点探讨性意见.     

德国功能派翻译理论述评

功能派翻译理论是20世纪70年代德国学者提出的翻译理论.主要理论有赖斯的文本类型和语言功能理论,曼塔利的翻译行为理论,威密尔的目的论和诺德的功能加忠诚理论,其核心是翻译目的或译文功能.该理论体系以目的为总则,把翻译放在行为理论和跨文化交际理论的框架中,为西方翻译理论界开辟了一条新的研究道路,它对中国译学的理论研究具有很高的参考和借鉴价值.