运用ARMA模型对股价预测的实证研究

时间序列分析是经济领域应用研究最广泛的工具之一,它用恰当的模型描述历史数据随时间变化的规律,并分析预测变量值。ARMA模型是一种最常见的重要时间序列模型,被广泛应用到经济领域预测中。给出ARMA模型的模式和实现方法,然后结合具体股票数据揭示股票变换的规律性,并运用ARMA模型对股票价格进行预测。     

利用改进的ARMA模型来预测供应链中的需求

本文介绍了ARMA模型的基本原理，分析了ARMA模型在市场需求预测中的不足，进行改进。并通过应用实例说明了改进的ARMA模型应用于需求预测过程的具体步骤和实施难点。     

上证指数的星期效应研究--基于ARMA-GARCH模型

2015年4月沪市单日成交突破万亿元，沪深股市成为世界第二大股市市场，股市的收益与星期之间是否存在星期效应？本论文分为两部分，一部分是近十年的星期效应，利用ARMA-GARCH模型研究，第二部分是研究近两年的星期效应，利用的ARMA模型研究。通过统计与模型得出结论：星期效应正在改变，可能以后的星期效应会变得不显著性，甚至消失，说明我国的市场有效性正在增强。     

基于时间序列模型在物流需求预测中的应用

本文采用时间序列模型进行物流需求预测，用实例从数据平稳性的判断，平稳化、标准化，建模，经模型的识别、定价、参数估计和检验，到预测及误差和置信区间的计算，详细地说明了时间序列模型在物流需求预测中是如何应用的。结果表明该ARMA模型能够较好地拟合并可获得较高的中短期预测精度。     

ARMA模型和VAR模型在煤炭价格预测中的对比分析

煤炭作为我国重要的传统能源,在国家能源战略中占据十分重要的地位,它的价格波动不仅影响到煤炭自身及其相关行业的生产经营,更对我国国民经济的长期发展带来重大影响,因此煤炭价格预测具有重大意义.本文利用2006年~2015年的煤炭价格数据,对当前在煤炭价格预测中应用较多的ARMA模型和VAR模型进行对比分析.结果表明:两种模型的均方根误差均小于限值,但在同时应用两种模型时,ARMA模型对煤炭价格走势的预测作用更加明显,预测结果更加准确.     

基于ARMA模型对澄星股份股票价格的预测

股票价格的变动受很多不确定因素的影响,并且各因素间有着非常复杂的关系,因此要从理论上彻底弄清楚股市的变化机理十分困难。然而股市是一个动态的、特殊的系统,它必然存在着规律。本文以"澄星股份"为例,利用EVIEWS软件对其股票价格建立ARMA模型,提出了股票价格序列的一步动态预测方法,用于股票价格序列的建模及股价短期预测,以期为企业和投资者在进行相关决策时提供有益的参考。     

湖北省农村居民人均纯收入的时间序列模型

本文利用湖北省1980-2008年农村居民人均纯收入时间序列数据,建立了ARMA(自回归移动平均)模型进行时间序列分析.分析结果表明,ARMA(1,1)模型能够提供较好的预测结果,因而可以用其进行预测,为相关部门提供参考数据.     

灰色-马尔可夫链模型在股市预测中的应用

用GM(1,1)预测具有良好的精确性和规律性,但对于随机波动性较大的股市行业,它的预测精度比较低,而马尔可夫模型可以克服波动性较大的局限性,弥补灰色模型的不足,因此将两者结合起来对股市进行预测将能提高预测的精度。本文依据上交所20个月末收盘指数预测后四个月的月末收盘指数范围,实证分析表明灰色马尔可夫链模型在股市预测中应用的可行性     

基于确定性和随机性组合模型的我国石油需求预测研究

随着中国经济发展,石油的需求急剧增加。利用石油消费的历史数据,构建了二次趋势-ARMA(2,1)石油需求组合预测模型,并对ARMA模型和组合模型的预测精度进行了比较,证明该组合模型的预测精度较高,可以作为我国未来石油需求预测的有效工具。     

基于EGARCH模型的我国通货膨胀率预测

文章收集中国通货膨胀数据，依次建立了ARMA模型、GARCH模型、TARCH模型、EGAR．CH模型。结果表明，EGARCH模型的拟合效果最好，可以为我国通货膨胀率提供短期预测。     

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.     

Ansätze und Ergebnisse anglo-amerikanischer M&A-Forschung

Based on a review of established U.S. management journals (1995–2003), six schools of thought are identified within the Anglo-American M&;A research: “Capital Market”, “Principal/Agent”, “Industrial Organization”, “Organizational Behavior”, “Human Resources” and “Strategic Management”. The literature review shows that the definition of M&;A success, the methods applied, and insights from empirical research differ according to the respective school of thought. Empirical studies focus on the resource combinations of merger partners, the specific circumstances of merger negotiations, and on integration management as antecedents of merger performance. Unfortunately, empirical findings have not yet provided reliable explanations for M&;A success. Based on the current state of Anglo-American M&;A research, the authors discuss implications for business practice, identify research gaps, and propose areas for future research.     

Introduction of New Technology with a Sound Transition of the Input-Output Structure

We examine the general equilibrium repercussions associated with the introduction of new technologies, using the generalized Leontief system that allows technological substitutions. We show that an untested introduction of cost-increasing technologies in any industry may result in creating a non-productive technological structure that does not satisfy the Hawkins-Simon condition, following the autonomous dynamic adjustment process with structural transitions in the economic system. Therefore, we propose a practicable control scheme of introducing cost-increasing technologies that strictly avoids the creation of non-productive structures in all periods of structural transition, using the available information on the ex ante technological structure.     

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。