Evaluating lifetime performance for the Pareto model with censored and imprecise information

A lifetime capability index L _tp has been proposed to measure the business lifetime performance, wherein output lifetime measurements are assumed to be precise from the Pareto model with censored information. In the present study, we study a more realistic situation where the lifetime output data are imprecise. The approach developed by Buckley [Fuzzy system, Soft Comput. 9 (2005), pp. 757–760; Fuzzy statistics: Regression and prediction, Soft Comput. 9 (2005), pp. 769–775] incorporated with some extensions (a set of confidence intervals, one on top of the other), is used to construct the triangular-shaped fuzzy number for the fuzzy estimate of the L _tp. With the sampling distribution of the unbiased estimator of the L _tp, two useful fuzzy inference criteria, its critical value and fuzzy p-value are obtained to assess the lifetime performance. The presented methodology can handle the lifetime performance assessment on the condition that sample lifetime data are involved with imprecise information, classifying the lifetime performance with the three-decision rule. With different preset requirements and a certain degree of imprecise data, we also develop a four quadrants decision-making plot where managers can easily simultaneously visualize several important features of lifetime performance for making a decision. An example of business lifetime data is given to illustrate the applicability of the proposed method.     

Difference-based variance estimator for nonparametric regression in complex surveys

A difference-based variance estimator is proposed for nonparametric regression in complex surveys. By using a combined inference framework, the estimator is shown to be asymptotically normal and to converge to the true variance at a parametric rate. Simulation studies show that the proposed variance estimator works well for complex survey data and also reveals some finite sample properties of the estimator.     

Testing Hypotheses About the Number of Factors in Large Factor Models

In this paper we study high‐dimensional time series that have the generalized dynamic factor structure. We develop a test of the null of k₀ factors against the alternative that the number of factors is larger than k₀ but no larger than k₁>k₀. Our test statistic equals max_{k0<k k1}(γ_k−γ_k+1)(γ_k+1−γ_k+2), where γ_i is the ith largest eigenvalue of the smoothed periodogram estimate of the spectral density matrix of data at a prespecified frequency. We describe the asymptotic distribution of the statistic, as the dimensionality and the number of observations rise, as a function of the Tracy–Widom distribution and tabulate the critical values of the test. As an application, we test different hypotheses about the number of dynamic factors in macroeconomic time series and about the number of dynamic factors driving excess stock returns.     

平等的谬误:以诺齐克的平等观为视野

诺齐克把平等视为机会上的平等,这一平等设想分为个人平等和社团组织的平等两个层次。在个人层次上,每个人都有着相似的参与各类活动的机会;在社团层次上,每一持不同信仰体系的社团都有着相似的参与政治和获取政治利益的权利。在此构想基础上,诺齐克批判了罗尔斯、德沃金等人的平等主义立场,从绝对个体权利出发,试图证实平等主义的谬误。     

和谐人：传统人性假设的批判与超越

人的存在方式就是人存在于特定历史阶段或社会状态下的具体形态,也表述为人性假设,如自然人、理性人、经济人、道德人等。人的存在方式并非恒定不变,而是由人性的发展变化所决定。“和谐人”作为社会主义和谐社会中特定的一种人的存在方式和新型的人性假设,是对传统人性假设的批判与超越。从人性假设视角研究和谐人,一定程度上丰富了人学的当代发展内涵,也是对社会主义和谐社会状态下社会主体的科学的合理的诠释,具有突出的理论意义和学术价值。     

线接触共轭曲面的类复向量矩阵算法

提出并利用类复向量矩阵方法计算线接触共轭曲面方程,只利用一个类复向量矩阵公式就完成全部坐标变换,消除了传统方法的多次坐标变换,使计算过程成倍简化.     

语块理论视角下的英语口语输出能力培养

针对学生英语口头表达能力相对薄弱这一现状,本文从语块理论和语言输入、输出假说视角,探讨以语块为理想的语言输入和输出单位,通过树立语块意识,拓宽语块输入途径,创设语块输出环境和机会,从而加强对学生英语口语输出能力的培养。     

基于英汉逻辑差异的学术语篇长句汉译策略研究

翻译西方学术文献的主要目的在于促进国内外学术交流和信息传播。然而,由于英汉两种语言的逻辑差异,学术语篇中的长句,一直是翻译中的难点。以学术语篇中由于逻辑差异而导致翻译误差的长句为例,对学术语篇中长句汉译从翻译策略角度进行尝试性的探讨,归纳总结出学术语篇中长句的英汉逻辑差异类型,并对每种类型的长句提出具体的翻译办法,以期促进翻译的实践与教学。     

英汉典型分裂句比较——兼论汉语典型分裂句的形成

从强调成分、焦点标记和被焦点成分之间的位置关系、省略成分三个方面对英汉典型分裂句进行了细致的比较。在分析英语典型分裂句语法化形成过程的基础上,重点讨论了汉语典型分裂句与判断句之间的语法化渊源关系。     

从生态系统管理到复合生态系统管理的演进

从自然生态系统到复合生态系统是生态系统发展和演变的历史必然,复合生态系统管理理论起源于生态系统管理理论和实践的发展,在梳理复合生态系统管理理论与实践发展历程的基础上,对复合生态系统管理理论国内外研究成果及实践进行述评,针对当前研究中的不足,提出复合生态系统管理理论研究的主要趋势和方向,为进一步研究奠定基础。