回归诊断在统计数据异常值探测中的应用

近年来有关异常值的理论探讨一直是个热点问题，从回归模型诊断的角度对统计数据中的异常值进行探测与分析，并在基于R语言的基础上，结合具体实例，给出回归诊断在统计数据异常值探测中的应用。     

用神经网络进行数字图象识别研究

手写数字识别的预处理技术包括二值化、行字切分、细化等,它结合使用MATLAB工具箱中提供的人工神经网络函数设计出一种手写数字识别的新方法。     

一种基于雷达图的雷达辐射源识别算法

在分析和考察雷达辐射源(Radar Emitter)多特征模式识别算法的基础上提出了一种基于雷达图(Radar Chart)中向量夹角余弦值的分类识别算法,借助雷达图实现了雷达辐射源空间特征向量向平面向量的转换,实现对雷达辐射源型号的自动识别,给出识别置信度.通过计算机仿真得到大于85%的正确识别率,进一步验证了算法在雷达辐射源识别工程中的可用性和可行性.     

用数据挖掘算法实现企业异常客户分析

企业异常客户的性质分析在目标销售中具有重要意义。本文利用最小二乘法作为分析工具,建立异常客户挖掘模型,以基于其拟合直线中的斜率来识别异常客户的性质:消极客户或积极客户。     

新颖应用电路·实用电路集

有些晶体不适用于使用逻辑门的振荡电路(图1)。如果晶体有一个以上的串联谐振模,那么这种电路就可以在几个频率中的一个频率上单独发生振荡。使用图2a所示的简易测试装置可以快速地在显示器(图2b)上识别具有副振荡模的晶体。如能识别不适用的晶体,那么晶体供应商就能改变制造方法,以消除副振荡模。     

萨北开发区异常高压层分布类型与治理

利用分层测压资料,测井曲线及RFT测试等技术,结合精细地质研究的沉积相带图等地质资料,准确地判断和识别异常高压层,并分析了对异常高压层成因,提出了压力结构调整技术及识别方法,使异常层的压力向合理压力过渡.研究表明,异常高压层是油层套管损坏的主要部位.     

预控图在卷烟制丝生产过程中的应用

预控图能够发现生产过程中的异常,实现过程异常的及早发现、及早调整,是一种简单易行的过程监控工具。通过在制丝生产过程中的不断探索和研究引入3σ原理对预控图进行了创新、改良,更加贴近烟草制丝过程,并取得了较好的应用效果。     

系统重要性地方政府债务的识别研究

从规模、关联性、复杂性和跨区域性四个维度建立了系统重要性地方政府债务识别指标体系,运用熵值法和灰色关联分析法对系统重要性地方政府债务进行了识别,结果表明:各省级地方政府债务在四个维度上均具有较大的差异;熵值法赋权表明关联性指标中的地区生产总值、金融机构融资额的权重最大;熵值法和灰色关联分析法对系统重要性地方政府债务识别的结果基本一致;综合两种方法测算了各省地方政府债务系统重要性综合指数并进行了聚类分析,结果表明江苏、广东、山东、四川的地方政府债务为中国系统重要性地方政府债务.     

试析盈余操纵的识别方法

盈余操纵在一定程度上背离了公认会计原则(GAAP),具有很大的危害性,有效地识别盈余操纵行为具有十分重要的意义。有多种用以识别盈余操纵行为的方法,如模型识别法、指标异常法、质量控制图法、审计意见分析法等。这些方法可以单独使用,也可以几种方法一起使用以相互认证。这些方法的运用将有助于迅速、有效地识别盈余操纵行为。     

一种特殊GDOP场景下的NLOS传播识别算法

在地面无线定位中,影响定位精度的最大因素是电波的非视距（NLOS）传播误差,定位估计前识别收发信机之间电波是视距（LOS）还是NLOS传播是提升定位精度需要研究的重要课题。为此,先对一种基于交叉面积的NLOS识别算法进行改进,然后提出了一种针对特殊几何精度因子（GDOP）场景下的NLOS识别算法——分步检验算法。该算法采用两步进行识别,先用数据检验筛选出测量样本中的LOS测量值,再用改进的交叉面积算法进行识别。仿真结果表明,分步检验算法在特殊GDOP场景下具有良好的识别性能。     

Long-term vision and economic development

This paper examines the effect on economic development of whether a country's policymakers adopt a long-term vision. We use a novel institutional variable that indicates whether policymakers have a long-term strategic vision. However, the difficulty in estimating a causal effect is that long-term vision is endogenous to economic development. Therefore, we use the future-time reference language variables introduced in American Economic Review, 103, 690; 2013 as instrumental variables for long-term vision. To account for endogeneity, the paper conducts two-stage least-squares estimations where the language instruments are used in the first stage to find an exogenous source of variation in long-term vision. The results show that long-term vision, instrumented by future-time reference, explains cross-country variations in economic development. These results are robust even after the inclusion of control variables and after the exclusion of outliers.     

船载外测数据的实时检择方法

分析了航天测量船的任务特点和船载外测数据的野值特性,研究实时处理船载外测数据野值的检择方法。通过两套设备的外测数据信息横向比对消除船摇对数据检择的影响,建立了自适应权值和阈值的模型,给出了基于坐标转换和加权融合的分步式船载外测数据实时检择方法。实例数据验证结果表明所提方法可以实时有效地解决外测预处理阶段的野值检择问题。     

晶须的阻燃防火应用

本文介绍了水合碱式硫酸镁晶须和硫酸钙晶须在阻燃防火中的应用。     

计算机审计中一种基于孤立点检测的数据处理方法

数据处理在计算机审计中非常重要。采用孤立点检测算法,根据预定义的规则自动从被审计数据中查找孤立点;判断检测出的孤立点是否可疑;通过对可疑孤立点进行审计专业判断,从而发现审计线索。与常用的计算机审计方法相比,该方法对行业知识的依赖较少,易发现被审计数据中的隐藏信息,并提高了审计效率。     

硫酸钙晶须的生产工艺研究

江苏省淮安地区的岩盐资源可得到硫酸钠型次饱和卤水,对其进行日晒制盐时产生大量的盐石膏(CaSO4.2H2O)和无水芒硝(Na2SO4),综合利用价值不高。研究了硫酸钠型矿卤制取硫酸钙晶须的工艺,提出先对硫酸钠型次饱和卤水进行除硫处理。处理后的清液可用于日晒制盐,CaSO4.2H2O沉淀经溶解、加热、过滤、冷却结晶转化可生产硫酸钙晶须,为硫酸钠型卤水资源的综合利用提供了一条新的技术路线。     

异常值点对单位根检验的致命影响

单位根检验是协整建模及误差修正分析的基础与前提。单位根检验结果是否可信,直接影响后续的协整建模过程,从而影响变量之间长期的结构均衡关系,以及短期的误差修正机制。事实上,单位根检验对样本异常值点十分敏感,从而容易导致检验结果的不稳定。与现有大多文献中的模拟数据不同,本文以实例给出了这样一个强有力证据：即使是单个异常值点,也可以对单位根检验产生致命的攻击。同时,比较了不同单位根检验方法对异常值点影响的敏感度。最后,建议了一种诊断单位根检验强影响点的预识别方法。     

Impact of star and movie buzz on motion picture distribution and box office revenue

This study contributes to research on the impact that consumer buzz has on movie distribution and box office success by examining the impact of buzz generated about the individual stars and about the movie itself. The results indicate that movie buzz is instrumental in boosting box office revenue throughout the theatrical release, not just in the later run, as has been suggested in previous studies. Star buzz can enhance box office receipts during the opening week and can contribute to the public's anticipation of the movie pre-release. However, early buzz can have a negative impact on revenue during subsequent weeks if the movie fails to resonate with the audiences. Model simulations reveal that, even for poorly received films, the overall impact of star buzz is positive because the initial revenue boost normally outweighs the later decline. Thus, this study empirically demonstrates the positive impact of star buzz on revenue, which helps shed light on the long-standing debate regarding the importance of star participation in the success of a movie.     

The core and periphery of the world economy

This paper reviews three models of foreign trade, including the Heckscher-Ohlin model, the new trade theory based on increasing returns to scale, and the model of economic geography and trade with agglomeration effects. It demonstrates that gravity models perform relatively well for differentiated and non-differentiated products. This result supports Hummels' and Levinsohn's () critique of the new theory foundation of the gravity equation. Furthermore, the bilateral trade relations of peripheral countries are often identified as outliers. This pattern of outliers is consistent with the model of geography and trade.     

Language and identity in the shadow: A multi-case study of a Japanese multinational corporation

This paper explores how different organizational identities can be constructed by the use of multiple languages within a multinational corporation’s (MNC) subsidiaries. Scholars are increasingly interested in the importance of language in international business but little is currently known about how identities interact with language across an MNC’s subsidiaries. Applying language and social identity theory, this paper analyses the interactions between organizational identity and the use of multiple languages within the lines of communication in the Thai, Taiwanese and US subsidiaries of a Japanese MNC, focusing especially on communications with customers and headquarters. The findings reveal the range of uses of different languages in the lines of communication and the attendant sharing and shaping of social identities in each subsidiary, thus highlighting the importance of the contexts of subsidiaries. In addition, in a sharp contrast to the approach to linguistic identity assumed in the current literature, the findings reveal how national identity can be sustained independently of the use of language. Moreover, the findings also reveal that perceived identity is influenced not only by actors’ language abilities and ethnicity, but also by their post-colonial views on both parent and host countries, and how this underpins shadow organizational structures.     

Productivity Premia for German Manufacturing Firms Exporting to the Euro‐Area and Beyond: First Evidence from Robust Fixed Effects Estimations

This paper reports estimates of the productivity premium of German firms exporting to the Euro‐zone and beyond, controlling for unobserved time‐invariant firm‐specific effects. Furthermore, it tests for self‐selection of more productive firms into exporting beyond the Euro‐zone. The main contribution of the paper is to correct a serious flaw in hitherto published studies that ignore the potentially disastrous consequences of extreme observations, or outliers. The paper shows that estimates of the exporter productivity premium by destination are driven by a small share of outliers that comprises some five per cent of all firms. These outliers are identified by a recently developed highly robust estimator for models with fixed effects. Using a ‘clean’ sample without these outliers, the estimated productivity premium of firms that export to the Euro‐zone only is no longer statistically different from zero at a conventional error level, and the estimated premium of firms exporting beyond the Euro‐zone, too, over firms that serve the German market only is tiny. Furthermore, an ex‐ante differential that is statistically significant and large only shows up for enterprises that exported to the Euro‐zone already and start to export to countries outside the Euro‐zone. These conclusions differ considerably from those based on non‐robust standard regression analyses.