Proportional cross-ratio model

Cross-ratio is an important local measure of the strength of dependence among correlated failure times. If a covariate is available, it may be of scientific interest to understand how the cross-ratio varies with the covariate as well as time components. Motivated by the Tremin study, where the dependence between age at a marker event reflecting early lengthening of menstrual cycles and age at menopause may be affected by age at menarche, we propose a proportional cross-ratio model through a baseline cross-ratio function and a multiplicative covariate effect. Assuming a parametric model for the baseline cross-ratio, we generalize the pseudo-partial likelihood approach of Hu et al. (Biometrika 98:341–354, 2011) to the joint estimation of the baseline cross-ratio and the covariate effect. We show that the proposed parameter estimator is consistent and asymptotically normal. The performance of the proposed technique in finite samples is examined using simulation studies. In addition, the proposed method is applied to the Tremin study for the dependence between age at a marker event and age at menopause adjusting for age at menarche. The method is also applied to the Australian twin data for the estimation of zygosity effect on cross-ratio for age at appendicitis between twin pairs.

     

Cross-ratio estimation for bivariate failure times with left truncation

The cross-ratio is an important local measure that characterizes the dependence between bivariate failure times. To estimate the cross-ratio in follow-up studies where delayed entry is present, estimation procedures need to account for left truncation. Ignoring left truncation yields biased estimates of the cross-ratio. We extend the method of Hu et al., Biometrika 98:341–354 (2011) by modifying the risk sets and relevant indicators to handle left-truncated bivariate failure times, which yields the cross-ratio estimate with desirable asymptotic properties that can be shown by the same techniques used in Hu et al., Biometrika 98:341–354 (2011). Numerical studies are conducted.     

南京大屠杀是国际社会早有的定论

本文以国际社会对南京大屠杀早有定论为论点,用严谨的逻辑证明阐述了国际社会对侵华日军南京大屠杀罪行认定的合法性和有效性.重申:南京大屠杀的历史定论不容篡改和否认.     

上海优化营商环境的国际对标分析

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日本新右翼剖析——兼论日本新右翼对中日关系的影响

日本新右翼是日本社会里一股根深蒂固的势力,始终伴随着日本的政治发展进程,构成日本难以摆脱的社会政治问题.与传统右翼相比,日本新右翼有着自己的特征,并在新的历史背景下,表现出诸如政坛新右翼、文化新右翼、宗教新右翼、拥核新右翼、全民新右翼等五个方面的发展态势.这些新右翼不仅对日本社会影响较大,而且对中日友好关系的健康发展破坏力巨大,对东亚地区乃至世界和平与发展构成一定的威胁.     

基于ERP系统的海关财务管理提升方案研究

基于ERP系统理念对海关的财务管理进行深刻分析，针对当前存在的财务管理观念落后、与业务脱节、数据流转不畅、存在信息孤岛、数据失真等问题，提出提升方案，以整合海关财务资源、优化财务管理结构，从而更好地为管理者的决策提供参考。