基于时变Copula方法的股票收益率相关性研究

股指收益率相关性问题多数从线性相关和静态相关的角度进行研究,本文预选取上证综合股指和恒生AH股H指实际数据,采用时变条件Copula模型动态研究以上两股指之间的相关性。用经验分布函数作为股指收益率的边际分布函数对条件时变Copula函数进行参数估计,最终采用拟合优度AIC和BIC准则选择最优动态连接Copula函数。实证结果表明,以上两股存在动态的上尾相关性,并且时变Copula模型刻画尾部相关性效果优于静态Copula,同时时变RG-Copula对数据的刻画能力较好。     

三种Copula-VaR计算方法与传统VaR方法的比较

金融风险测量VaR方法广泛应用于银行等金融机构,Copula技术以其处理非正态联合分布函数所具有的良好性质逐渐成为国内外研究的热点。本文将Copula理论应用于VaR的计算方法,并与传统的VaR方法进行比较,通过美元和欧元组合的实证研究,得到基于Copula的VaR方法能够更加有效地测量风险的结论。     

我国上市银行系统性风险测度研究

本文基于边际期望损失和SRISK指标去探讨我国上市银行的系统性风险。本文选取了我国16家上市银行2013年的日度收益率数据和其他相关数据进行分析,得到了这16家银行的基于边际期望损失的排名和基于SRISK指标的排名。结果显示大型国有商业银行系统性风险贡献度比较低,但是总的风险比较高,小型股份制银行则相反。     

风险约束下的中国上市银行效率问题研究

本文采用2007年1月至2011年12月中国16家上市银行面板数据,首先,通过三因素风险估计模型对系统性风险和非系统性风险进行分解;然后,通过构建随机边界成本函数,将风险因素引入银行效率的测算模型,利用单阶段估计技术,对风险、治理结构、市场结构等各方面影响因素进行了分析,并对风险约束模型和无风险模型进行比较。研究发现：不考虑风险因素将导致无效率值的明显高估;在所有模型中,大型商业银行均显示出了较强的成本优势。     

一种多资产组合风险度量解决之道：正则藤Copula

为准确地度量包含有多项金融资产的组合的风险,本文提出使用一种新的高维Copula构建方法,正则藤Copula（Canonical Vine Copula）,来对多资产间的非线性相关结构进行建模,该函数呈现为一个以一系列成对Copula函数作为节点的“藤”的层叠结构。本文基于上海、香港和台湾三个股票市场对构建该高维Copula函数时各个节点上成对Copula函数类型的选取进行了讨论,并证实了正则藤Copula函数相比传统的多元Copula函数能够更灵活地描述各市场间尾部相关性的复杂形式。样本外风险预测绩效分析和模拟研究均表明,使用正则藤Copula函数确实能够更为稳健和准确地预测组合VaR。     

时变Copula模型的非参数推断

运用Copula模型研究金融变量之间的相关结构,是近年来金融分析中的一个热点,如何估计Copula模型中的时变参数则是一个重点和难点问题。本文从非参数建模思想为切入点,提出经验分布函数—局部极大似然法(ECDF-LML)估计Copula函数中的时变参数,研究了Copula模型参数是否时变的统计假设检验问题。最后通过大量随机模拟研究验证了本文所提出的方法较DCC-MGARCH方法在刻画随机变量动态相关性方面更具优越性且很稳健。     

“汇改”后汇率变动对股票市场的影响——基于具体行业股票收益率的实证分析

使用GARCH和分位数回归模型,以11个具体行业上市公司为样本,对2005年7月＂汇改＂后人民币汇率变动与股票市场中行业股票收益率波动的相关性进行分析,研究结果表明：相对于即期汇率,以远期汇率为代表的汇率预期对行业股票收益率影响更为明显;预期汇率对行业股票收益率的影响具有明显的阶段性特征;在第一阶段,受远期汇率影响的行业主要对远期汇率的升值比较关注,而在第三阶段,不同行业对即期汇率和远期汇率的反应呈现多样化。     

多金融资产风险价值的Copula计量方法研究

本文侧重研究多金融资产的风险价值计量方法。利用Copula联结函数、混合分布和Jacob矩阵，构造多金融资产风险价值的Copula计量方法，指出Copula计量方法相关的几个重要问题。     

极值统计理论在金融风险中的应用

本文考察外汇交易中由于汇率的急剧变化可能引起的巨大损失,应用极值统计方法估计风险价值,并与经验分布函数进行比较,得到了很好的结果,通过对29年来的日元／美元汇率的实证分析,说明极值方法在统计风险价值中的应用。     

混合Copula模型选择及其应用

Copula函数是处理变量间相关结构的有力工具。特别在实际的金融领域中,变量间的相关结构往往比较复杂。如果用单个Copula函数来处理,具有一定的局限性。混合Copula(M-Copula)函数是把不同的Copula函数混合在一起,这样能够更好地描述变量间的相关结构。文章主要运用由Gumbel、Clayton和Frank组成的混合Copula模型对上证A指和成份A指的相依结构进行建模,采用非参数核密度方法估计边缘分布,然后用EM算法求出混合Copula函数的权重及相关参数,实证结果表明:混合Copula模型更能够准确地描述两个市场之间的相依结构,且两个市场的上尾相依关系要强于下尾的相依关系。     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.