Towards Uniformly Efficient Trend Estimation Under Weak/Strong Correlation and Non‐stationary Volatility

In this paper, we consider the deterministic trend model where the error process is allowed to be weakly or strongly correlated and subject to non‐stationary volatility. Extant estimators of the trend coefficient are analysed. We find that under heteroskedasticity, the Cochrane–Orcutt‐type estimator (with some initial condition) could be less efficient than Ordinary Least Squares (OLS) when the process is highly persistent, whereas it is asymptotically equivalent to OLS when the process is less persistent. An efficient non‐parametrically weighted Cochrane–Orcutt‐type estimator is then proposed. The efficiency is uniform over weak or strong serial correlation and non‐stationary volatility of unknown form. The feasible estimator relies on non‐parametric estimation of the volatility function, and the asymptotic theory is provided. We use the data‐dependent smoothing bandwidth that can automatically adjust for the strength of non‐stationarity in volatilities. The implementation does not require pretesting persistence of the process or specification of non‐stationary volatility. Finite‐sample evaluation via simulations and an empirical application demonstrates the good performance of proposed estimators.     

Efficient Estimation in Heteroscedastic Partially Linear Varying Coefficient Models

This article considers statistical inference for the heteroscedastic partially linear varying coefficient models. We construct an efficient estimator for the parametric component by applying the weighted profile least-squares approach, and show that it is semiparametrically efficient in the sense that the inverse of the asymptotic variance of the estimator reaches the semiparametric efficiency bound. Simulation studies are conducted to illustrate the performance of the proposed method.     

Conditional time-dependent nonparametric estimators with an application to healthcare production function

ABSTRACT

By using the probabilistic framework of production efficiency, the paper develops time-dependent conditional efficiency estimators performing a non-parametric frontier analysis. Specifically, by applying both full and quantile (robust) time-dependent conditional estimators, it models the dynamic effect of health expenditure on countries’ technological change and technological catch-up levels. The results from the application reveal that the effect of per capita health expenditure on countries’ technological change and technological catch-up is nonlinear and is subject to countries’ specific income levels.     

Adherence to three different strategies to prevent early onset GBS infection in newborns

ProblemDespite the introduction of preventive guidelines, no decrease in the incidence of early onset infection was observed.BackgroundEarly onset group B streptococcal (EOGBS) infection is an important cause of neonatal morbidity and mortality.AimOur study was conducted to determine adherence to three guideline-based group B streptococcus (GBS) preventive strategies.MethodsA prospective experimental study clustered by obstetric collaboration region was performed between March 2013 and August 2014 among midwives, obstetricians and paediatricians in the Netherlands. At baseline, the three regions operated according to the Dutch preventive strategy (founded on the risk-based strategy) in order to prevent EOGBS infection, whereas in the study period they followed either the risk-based, the combination or the Dutch strategy. Adherence was measured prospectively per pregnant woman, using predefined core elements of each preventive strategy: identification of risk factors, maternal GBS screening, application of intrapartum antibiotic prophylaxis and observation of the child. Data about adherence to the core elements were collected from medical records, maternal questionnaires and laboratory test results.FindingsIn the three regions, a total of 121 care providers and 1562 women participated.We found an overall adherence of 90% to the risk-based strategy, 57% to the combination strategy and 89% to the Dutch strategy. Adherence to a strategy in case women had EOGBS risk factors was below 20% in all strategies.DiscussionThe majority of women with EOGBS risk factors did not receive the care prescribed by any of three preventive strategies and were not treated optimally.ConclusionThe risk-based and the Dutch strategy are the recommended strategies for implementation.     

关于高校中层副职干部几个基本问题的思考

高校中层副职干部具有高校干部、中层干部和副职干部的群体特征，应当具备相应的政治、思想、道德、业务、能力和身体等方面的基本素质。高校应当按照现行干部配置规制，结合内部管理体制和工作机制任用干部。高校中层副职干部的日常活动涉及到社会、学校、家庭等多个层面，必须妥善处理好各种人事关系。     

民族记忆与文化基因--瑶族民族记忆中“中华民族共同体”文化基因的表征及其价值阐释

民族记忆既是传承民族文化基因的载体,也是彰显民族文化基因的重要文化表征。民族记忆作为延续民族历史和文化基因的内在根基,通过传承民族历史文化、建构民族身份、塑造民族形象等形式传承和彰显民族文化基因的内在特征。以瑶族为代表的少数民族文化基因是中华民族文化基因的重要组成部分,深入挖掘瑶族民族记忆中蕴含的“中华民族共同体”文化基因,并阐释其内在的价值与意义,对培育和铸牢我国各民族的“中华民族共同体”意识有着重要的理论价值与现实意义。     

关于有限群的可解性

利用极大子群的几乎正规的概念得到了有限群为可解群的若干充要条件．     

集权、分权、利益集团理论与美国公共行政的发展

本文从论述汉密尔顿、杰斐逊和麦迪逊政治思想入手，分析了以集权思想为特征的汉密尔顿＂古典式行政模式＂、以分权思想为特征的杰斐逊＂浪漫式行政模式＂和以利益集团思想为特征的麦迪逊＂新古典式行政模式＂产生的历史条件和原因，并从宏观上考察了３种＂行政模式＂在美国行政的不同发展阶段中的实践和影响。     

试论农业生物基因工程技术产业化

农业生物基因工程技术产业化尚处在起步阶段 ,但是已经呈现迅猛发展势头。到目前为止 ,很多种农作物已经有了不同改良性状的转基因新品种 ,部分农作物的不同改良性状的转基因新品种已经进入商品化种植 ,并且商品化种植的面积逐年扩大。转基因农作物商品化种植面积主要分布在发达国家 ,广大发展中国家分布面积不大。农业生物基因工程技术产业化跳出了以前农业生产的基本思路 ,通过改造农作物以增强其适应不良环境的能力来发展农业生产。农业生物基因工程技术产业化面临人们对农业生物基因工程技术产业化是否会危害人类和环境的担心、农业生物基因工程技术不完善、农业生物基因工程技术研究和开发体制落后等问题。需要从强化农业生物基因工程技术安全管理和知识宣传、强化农业生物基因工程技术研究、深化农业生物基因工程技术研究和开发体制改革等方面解决这些问题     

试论强化国家创新体系

我国现有的国家创新系统存在效率低下和创新活力不强的问题。强化我国的创新工作应该采取适应市场 ,及时调整创新系统中各因素的角色 ;实现创新组织网络化达到资源共享 ;政府推动创新文化建设 ,营造创新氛围这三项措施 ,从而提高我国整体创新能力和国家创新系统效率。