Copula-based regression models: A survey

In this review paper we collect several results about copula-based models, especially concerning regression models, by focusing on some insurance applications.     

Narratives of life experience in the digital space: a case study of the images in Richard Deitsch’s single best moment project†

ABSTRACT

On 8 July 2013, Sports Illustrated media critic Richard Deitsch – inspired by a photo that captured a friend celebrating with a brother who had won the NCAA Hockey Championships – asked his 90,000-plus Twitter followers if they had the best moment of their life captured in a photograph. Deitsch retweeted the initial pictures, which prompted many more people to send out photos of their favorite moments. Many of his followers shared photos of some of their most intimate moments, leading CNN to call Deitsch ‘the sportswriter who made Twitter cry’ [Mendoza, D. (2013, July 11). The sportswriter who made Twitter cry. CNN. Retrieved December 11, 2013, from http://www.cnn.com/2013/07/11/tech/storify-best-moments/.s]. Through a thematic examination of 314 photos shared in the Deitsch exchange, the authors reveal that an overwhelming number of images are identified as milestone moments, or narratives of life experience, which denotes that as communication platforms evolve and technologies offer different modes of expression, users are still selecting narrative structure to disseminate their messages.     

The Generalized Conditional Autoregressive Wishart Model for Multivariate Realized Volatility

It is well known that in finance variances and covariances of asset returns move together over time. Recently, much interest has been aroused by an approach involving the use of the realized covariance (RCOV) matrix constructed from high-frequency returns as the ex-post realization of the covariance matrix of low-frequency returns. For the analysis of dynamics of RCOV matrices, we propose the generalized conditional autoregressive Wishart (GCAW) model. Both the noncentrality matrix and scale matrix of the Wishart distribution are driven by the lagged values of RCOV matrices, and represent two different sources of dynamics, respectively. The GCAW is a generalization of the existing models, and accounts for symmetry and positive definiteness of RCOV matrices without imposing any parametric restriction. Some important properties such as conditional moments, unconditional moments, and stationarity are discussed. Empirical examples including sequences of daily RCOV matrices from the New York Stock Exchange illustrate that our model outperforms the existing models in terms of model fitting and forecasting.     

后现代叙事话语

西方后现代主义文学创造出了许多前所未有的叙事话语。与传统叙事话语不同的是,后现代叙事话语并非是一种纯技法的操作,而是在本体的层次上与叙事主体或叙事对象密切相关,叙事的结构、视角、情感色彩和语调特征本身就是叙事主体或叙事对象的存在观与生存状态的“直观”写真。后现代派文学叙事话语主要有五种类型,“平面无深度”叙事话语：对本质与意义的消解;“错乱零散化”叙事话语：精神分裂的生存状态;“黑色幽默式”叙事话语：面临绝望的强自解脱;“极度冷漠化”叙事话语：人情况灭的社会现实;“剪贴拼画式”叙事话语：虚幻的世界与虚幻的语言。     

消费文化与1990年以来大学题材小说的叙事成规

1990年代以来的大学题材小说浸染着浓厚的消费文化色彩,并促其生成了一套深层的叙事成规。污名化的同质叙述对大学的指认带有否定性价值。二元对立的惯习叙事模式,主要表现为堕落与守望的对峙。新闻化的叙事使小说充斥着大量新闻信息,小说的想象与虚构因素匮乏。人物塑造类型化、浅显化,缺少新意与深意。     

多车场集送一体化车辆调度问题及其遗传算法研究

针对物流配送中的多车场一体化车辆调度问题提出了智能处理方法,采用了基于自然数的一体化配送对路径表示方式,用里程约束来控制车场的插入,以增加惩罚的方式加入时间窗约束。并且根据具体约束情况设计了改进的遗传算法,采用了动态染色体、改进的交叉和变异法、内部扰动和外部扰动等技术,提高了遗传算法的优化效率和优化效果。介绍了此算法的原理,给出了具有一个代表性算例试验结果和结果分析。试验结果表明了此方法对优化有里程和时间窗约束的多车场一体化车辆调度问题的有效性。     

Interdependency among addictive behaviours and time/risk preferences: Discrete choice model analysis of smoking, drinking, and gambling

This paper simultaneously measures the rate of time preference and the coefficient of risk aversion, as well as investigates the interdependencies of four addictive behaviours: smoking, drinking, pachinko (a popular Japanese form of pinball gambling), and horse betting among a sample of the Japanese population. We reach two main conclusions. First, there are significant interdependencies among the four addictive behaviours, in particular between smoking and drinking and between gambling on pachinko and the horses. Second, we conclude that the higher the time preference rate and the lower the risk aversion coefficient becomes, the more likely individuals smoke, drink frequently, and gamble on pachinko and the horses.     

Trade-off between quoted lead time and price

In a make-to-order environment, lead time and price can play a crucial role in determining the financial success of a firm. Their importance increases when demand is sensitive to the quoted lead time and price. A model is presented which uses the quoted lead time and price as a mechanism to determine the optimal demand level. The relationships between the model parameters and their impacts on the firm's profit is also analysed. In addition, the effect of the number of job requests, and the mean processing time are examined. Based on the results presented in this paper, there is clear indication that the firm's profit is sensitive to the inventory holding rate, and that the inventory holding cost component is redundant in the presence of a tardiness cost component.     

A Comparison of Ambient Casino Sound and Music: Effects on Dissociation and on Perceptions of Elapsed Time While Playing Slot Machines

This research examined the effects of a casino’s auditory character on estimates of elapsed time while gambling. More specifically, this study varied whether the sound heard while gambling was ambient casino sound alone or ambient casino sound accompanied by music. The tempo and volume of both the music and ambient sound were varied to manipulate temporal engagement and introspection. One hundred and sixty (males = 91) individuals played slot machines in groups of 5–8, after which they provided estimates of elapsed time. The findings showed that the typical ambient casino auditive environment, which characterizes the majority of gaming venues, promotes understated estimates of elapsed duration of play. In contrast, when music is introduced into the ambient casino environment, it appears to provide a cue of interval from which players can more accurately reconstruct elapsed duration of play. This is particularly the case when the tempo of the music is slow and the volume is high. Moreover, the confidence with which time estimates are held (as reflected by latency of response) is higher in an auditive environment with music than in an environment that is comprised of ambient casino sounds alone. Implications for casino management are discussed.