Collective versus Individual Effects in Survival Analysis of Multiple Failures

In survival analysis, we sometimes encounter data with multiple censored outcomes. Under certain scenarios, partial or even all covariates have ‘similar’ relative risks on the multiple outcomes in the Cox regression analysis. The similarity in covariate effects can be quantified using the proportionality of regression coefficients. Identifying the proportionality structure, or equivalently whether covariates have individual or collective effects, may have important scientific implications. In addition, it can lead to a smaller set of unknown parameters, which in turn results in more accurate estimation. In this article, we develop a novel approach for identifying the proportionality structure. Simulation shows the satisfactory performance of the proposed approach and its advantage over estimation under no assumed structure. We analyse three datasets to demonstrate the practical application of the proposed approach.     

A Proportional Hazards Regression Model for the Subdistribution with Covariates‐adjusted Censoring Weight for Competing Risks Data

With competing risks data, one often needs to assess the treatment and covariate effects on the cumulative incidence function. Fine and Gray proposed a proportional hazards regression model for the subdistribution of a competing risk with the assumption that the censoring distribution and the covariates are independent. Covariate‐dependent censoring sometimes occurs in medical studies. In this paper, we study the proportional hazards regression model for the subdistribution of a competing risk with proper adjustments for covariate‐dependent censoring. We consider a covariate‐adjusted weight function by fitting the Cox model for the censoring distribution and using the predictive probability for each individual. Our simulation study shows that the covariate‐adjusted weight estimator is basically unbiased when the censoring time depends on the covariates, and the covariate‐adjusted weight approach works well for the variance estimator as well. We illustrate our methods with bone marrow transplant data from the Center for International Blood and Marrow Transplant Research. Here, cancer relapse and death in complete remission are two competing risks.     

透视新时期我国区域规划的发展与变革

区域规划作为时代发展的产物,是国家和地区调控区域发展的手段.20世纪90年代以来,随着我国政治、经济转型的不断深入,传统计划经济体制和等级官僚管理体系正发生着深刻变化,并对我国区域规划研究产生显著影响.     

珠三角地区企业员工满意度及离职意愿的探讨

员工的自愿离职直接影响到企业人才的稳定性,也会增加企业的人力资源成本。员工的实际离职产生于离职意愿,而离职意愿与员工满意度密切相关。了解员工对工作的态度,将有助于我们制定相应的人力资源管理的措施,更好地留住企业所需的人才,增强企业的竞争力。文章采取问卷调查的方法,通过方便随机抽样获得1469份有效问卷,被试者来自珠三角地区不同企业的员工。研究内容主要包括:广东珠三角地区的企业员工工作满意度和构成因素,员工离职意愿,人口特征对满意度、离职意愿、工作积极性的影响。     

90年代后期中越经贸关系及其发展前景

中国同越南之间的经贸联系自古已经开始 ,两国的民间贸易往来十分频繁 ,但受各种因素的影响 ,两国的官方贸易发展缓慢。 1991年中越关系正常化后 ,双方的贸易关系开始迅速发展 ,正规贸易额基本呈直线上升趋势 ,但客观来讲 ,仍未达到应有的水平 ,特别是与两国日益强化的政治关系相比较为滞后。如何改变这种状况 ,一直是两国政府十分关注的议题。目前 ,随着双方政治关系的不断发展 ,加强经贸领域的合作已逐步提到议事日程。其实 ,中越双方在经贸领域有着十分有利的合作条件 ,只要双方相互重视 ,诚意合作 ,共同努力 ,相信中越经贸合作的前景是良好的。     

SIMEX estimation for single-index model with covariate measurement error

AStA Advances in Statistical Analysis - In this paper, we consider the single-index measurement error model with mismeasured covariates in the nonparametric part. To solve the problem, we develop a...     

基于混合CVaR的供应链绿色研发-广告决策与协调机制研究

针对消费者绿色偏好异质性而引发产品需求不确定性的情形,构建了基于混合CVaR准则的绿色供应链双层风险决策模型,研究了一个具有不同风险态度制造商与一个具有不同风险态度零售商所组成供应链的最优绿色研发投入及广告宣传水平等决策问题,分析了成员不同风险态度对供应链相关决策的影响。在此基础上,提出一个基于风险补偿的双向成本分担契约协调机制,并给出实现供应链协调的合理转移支付区间,最后通过数值分析验证该协调机制的有效性。结果表明,无论供应链成员表现为何种风险态度,该契约均能实现供应链协调,并且对由风险规避制造商与风险追逐零售商所组成的供应链协调效果最为显著。     

The significance of meaning. Why IPBES needs the social sciences and humanities

The term “biodiversity” is often used to describe phenomena of nature, which can be studied without a reference to the socially constructed, evaluative, or indeed normative contexts. In our paper, we challenge this conception by focusing particularly on methodological aspects of biodiversity research. We thereby engage with the idea of interdisciplinary biodiversity research as a scientific approach directed at the recognition and management of contemporary society in its ecological embedding. By doing this, we explore how research on and assessments of biodiversity can be enhanced if meaning, aspiration, desires, and related aspects of agency are methodically taken into account. In six sections, we substantiate our claim that the discourse on biodiversity (including the IPBES (Intergovernmental science-policy Platform on Biodiversity and Ecosystem Services) debate) is incomplete without contributions from the social sciences and humanities. In the introduction, a brief overview of biodiversity’s conceptual history is provided showing that “biodiversity” is a lexical invention intended to create a strong political momentum. However, that does not impede its usability as a research concept. Section 2 examines the origins of the Convention on Biological Diversity (CBD) by way of sociological discourse analysis. Subsequently, it proposes a matrix as a means to structure the ambiguities and tensions inherent in the CBD. The matrix reemphasizes our main thesis regarding the need to bring social and ethical expertise to the biodiversity discourse. In Section 3, we offer a brief sketch of the different methods of the natural and social sciences as well as ethics. This lays the groundwork for our Section 4, which explains and illustrates what social sciences and ethics can contribute to biodiversity research. Section 5 turns from research to politics and argues that biodiversity governance necessitates deliberative discourses in which participation of lay people plays an important role. Section 6 provides our conclusions.     

“BOT+TOD”轨道交通投融资模式初探——以佛山市地铁二号线为例

近年来,我国城市轨道交通进入快速发展阶段,城市轨道交通的快速发展需要巨大的资金支撑,传统城市轨道交通投融资方式已经难以为继。本文从城市轨道交通TOD发展模式出发,分析"BOT+TOD"投融资模式的特点及其总体方案,并且以佛山市地铁二号线为例,提出"BOT+TOD"的具体实施路径与操作方法,为市政公用基础设施投融资体制改革、创新轨道交通投融资模式、土地管理制度的改革提供借鉴。通过此创新投融资模式在我国城市轨道交通中的成功运用,改善融资困难局面,促进我国城市轨道交通持续快速发展。