A log rank type test in observational survival studies with stratified sampling

In randomized clinical trials, the log rank test is often used to test the null hypothesis of the equality of treatment-specific survival distributions. In observational studies, however, the ordinary log rank test is no longer guaranteed to be valid. In such studies we must be cautious about potential confounders; that is, the covariates that affect both the treatment assignment and the survival distribution. In this paper, two cases were considered: the first is when it is believed that all the potential confounders are captured in the primary database, and the second case where a substudy is conducted to capture additional confounding covariates. We generalize the augmented inverse probability weighted complete case estimators for treatment-specific survival distribution proposed in Bai et al. (Biometrics 69:830–839, 2013) and develop the log rank type test in both cases. The consistency and double robustness of the proposed test statistics are shown in simulation studies. These statistics are then applied to the data from the observational study that motivated this research.     

天津城市游憩商业区(RBD)初步研究

一、问题的提出 随着经济的发展和信息时代的来临,城市越来越以多样化的功能显示出其区域核心的地位,城市不仅担当起区域经济、文化、政治、信息服务的中心,更成为旅游活动的中心,而且旅游中心的功能作为城市共性的功能会随着城市的发展得到不断强化.     

Ethnic Identities under the Tourist Gaze

This paper examines the construction of Bai ethnicity and Bai identity on the tourist market in Dali, Dali Bai Autonomous Prefecture, Yunnan, China. Focusing on how the social landscape of Dali has changed in response to the development of tourism, this paper explores how Bai ethnicity is advocated as a product loaded with potential economic values. The author discovers that ‘commerce of authenticity’ (T. Oakes, Tourism and modernity in China. London, Routledge, 1998 Oakes, T. 1998. Tourism and modernity in China, London: Routledge.  [Google Scholar]), and different forms of ethnicity and artefacts promoted in the tourist market have not drowned out the sense of being ethnically Bai. Instead, the tourist industry has become a daily reminder of ethnicity to both insiders and outsiders by making people more self-conscious and reflexive about the ‘cultural stuff’ that they may have previously taken for granted, or may have left unattended. This paper demonstrates how locals actively appropriate state-defined categories and reshape them into the repertoire they desire.     

南京中山植物园游憩功能满意度评价研究

随着植物园"旅游经济"的发展,植物园在承担植物科学研究及科普功能的同时,也成为公众日常休闲的重要绿地。本文选取南京中山植物园作为研究对象,建立评价体系并运用模糊综合评价法对游客满意度进行研究,探寻影响植物园游憩功能的显著因子,为未来植物园规划设计提供参考。结果表明:游客对南京中山植物园的游憩功能达到基本满意水平。其中,植物物种多样性、景区分布、建筑景观、声景观的满意度较高,滨水景观的满意度评价值较低。通过Pearson相关系数发现植物色彩丰富度、科普场所、科普内容是影响游客满意度的显著因子。运用IPA图对16项评价因子进行重要度-满意度分析,并对各象限内的因子提出改进方向。最后基于游憩功能满意度评价结果,提出改进策略:加大对植物园休息设施、卫生设施、娱乐设施和商业服务设施的投入;更新科普方式,增添特色游憩主题园区;完善现有道路体系,增强对北部专类园的可达性;增加色叶植物的种类、提高色彩丰富度等。以期为中山植物园游憩功能的优化及其他植物园的规划设计提供借鉴。     

冯雪峰论:“修正主义文艺“批判运动人物检讨(之一)

冯雪峰是“修正主义文艺”批判运动第一阶段（ １９５６～ １９６２）主要的批判对象．作 为唯一的参加过长征的左翼文艺理论家,冯雪峰于１９５７年遭遇清算,除了他那不合时宜的革命 现实主义理论的启蒙倾向,还有一个重要的原因,就是１９世纪３０年代已然形成、长期以来没 能解决的宗派主义从中作祟．     

Hard thresholding regression

In this paper, we propose the hard thresholding regression (HTR) for estimating high‐dimensional sparse linear regression models. HTR uses a two‐stage convex algorithm to approximate the ?₀‐penalized regression: The first stage calculates a coarse initial estimator, and the second stage identifies the oracle estimator by borrowing information from the first one. Theoretically, the HTR estimator achieves the strong oracle property over a wide range of regularization parameters. Numerical examples and a real data example lend further support to our proposed methodology.     

民俗文化与甘肃旅游业的发展

甘肃旅游业的一大优势在于丰富的少数民族民俗文化旅游资源。大力发展甘肃少数民族的民俗文化资源,形成以各民族典型节日庆典为主要内容、以民俗美为核心的民俗旅游体系,充分发挥少数民族旅游胜地立体化旅游资源优势,对推动甘肃的经济具有很强的实践性和深远的意义。     

论传统生态伦理思想与当代环境法治的完善

中国古代制定有大量和环境保护相关的法律规定,蕴含着极为丰富的生态伦理思想。其中,"天人合一"、"仁民爱物"、"寡欲节用"为其内在的生态伦理基础。对其进行挖掘梳理,有助于解决现代环境法治自身理念上所存在的困境。当代中国环境法治存在的主要问题在于长期割裂法律与生态伦理的内在联系。结合传统生态伦理观,可以从环境立法、执法、守法等层面对我国的环境法治提出完善。     

员工雇佣关系感知的动态发展及其管理策略——以心理契约理论为分析视角

心理契约是分析组织——员工间雇佣关系的重要理论框架。心理契约本质是员工对其与组织间雇佣关系持有的认知图式。雇佣关系建立初期是员工心理契约形成的起始,在员工进入组织工作后逐步完善,在雇佣关系变化过程中心理契约呈现动态演化趋势。心理契约发展演变对组织管理有着多重启示。     

论当前中国房屋拆迁中的权利保护

住房权是人权的一项基本内容。目前,我国城市化进程中房屋拆迁征收的法律依据、拆迁机制、权利保障和拆迁行为不完全适应并满足权利保障需要。完善拆迁法律规范,建立健全防止利益冲突机制,严格执行国家法律法规,不仅关系社会和谐稳定,亦关系政治稳定与政府形象。