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41.
Are high–frequency traders (HFTs) informed? To address this question, we examine HFTs' activity in the call auction environment, where speed-related trading is limited and signal processing capacity becomes more relevant. To model the call market, we consider the Kyle (1989) rational expectations framework for strategic trading. The test we propose for detecting informed HFTs in this market assesses potential deviations of the informativeness of HFTs' aggregate (net) demand, from the informativeness of the aggregate demand submitted by the rest of the traders. Data from the Euronext Paris preopening phase indicate that informed HFTs are present in the market just before the opening. Our results provide useful guidance for the assessment of the influence of HFTs’ quotes on price quality, an important issue for market regulators and policy makers. 相似文献
42.
随着巴塞尔协议的公布,操作风险(Operational Risk)的量化模型已经成为银行业目前研究的主要课题。本文按照巴塞尔协议规定,利用损失分布方法(Loss Distribution Approach,LDA)来度量操作风险,这种方法的优点在于分别度量损失事件发生频度以及损失幅度,然后利用组合分布方法来研究一段时间内的累积损失分布。本文主要讨论在商业银行内部如何执行LDA以及引入操作风险在险值(Valueat Risk,VaR)的概念,并且介绍了能够反映损失分布的分布函数。同时按照巴塞尔协议公布的方法和策略,从损失事件类型、业务部门以及损失分布额度的估计方法探讨利用高级度量方法的可能性和现实性以及操作中的现实问题。 相似文献
43.
广义线性模型作为非寿险定价的经典模型,在非寿险定价中得到了广泛的应用。近年来,以提升算法为代表的机器学习算法在保险领域取得了很好的效果,为保险产品定价提供了一种新的选择。本文将提升算法思想分别融入到回归树模型和广义线性模型(GLM)中去,用得到的新模型对我国车险索赔频率进行预测建模分析,并与传统的回归树模型和GLM进行比较。结果表明,加入提升算法后传统车险索赔频率建模模型的效果得到了很大的改善,并且在不存在过拟合的前提下,随着模型深度和迭代次数的增加,模型的效果也在不断优化。 相似文献
44.
本文提出了晶体和频率控制元件的模型,介绍了基本电路的设计,并详细讨论了压控晶体振荡器调制器产生最小音频失真的必要条件。 相似文献
45.
《Journal of Retailing》2017,93(2):201-211
Retailers typically use the strategy of providing a discount to induce the sale of a new product at a pre-order stage. Despite the prevalence of this strategy, providing discounts might not be effective for all consumers. The present research shows that the positive effect of a discount depends on consumer temporal orientation. Results from four experimental studies reveal that a large discount positively affects present-oriented, but not future-oriented, consumers. The findings suggest that perceived financial risk and perceived product quality sequentially mediate the effect of discount size on value toward the deal and purchase intention. A third-party product quality rating boosts quality perceptions, which in turn reduces perceived financial risk and positively enhances value toward the deal along with purchase intention. Our findings demonstrate that when the brand itself acts as a reliable signal of quality, a discount has its intended effect for both present- and future-oriented consumers. Overall, the findings of this research suggest that a retailer can use quality cues along with a discount, especially for a new brand, to appeal to the broadest group, as it will attract both future- and present-oriented consumers. 相似文献
46.
This paper develops the notion of lifetime activity cues in customer base analysis. The authors first discuss the impact of lifetime indicators, such as customers' conceptual response to marketing activities, and then demonstrate how such lifetime cues can be embedded into the Pareto/NBD model. The authors theoretically analyze the implication of this additional behavioral indication on the model's predictions. In an illustrative example, they aim to establish an intuitive understanding of the effects of such information. Evidence from the cellular phone industry supports the relevance of this concept: The empirical study finds a substantial improvement in predictive accuracy in two independent holdout samples. The study concludes with a discussion of the managerial relevance of the proposed approach and opportunities for further research. 相似文献
47.
Nowadays social network influencers play an important role in marketing by introducing products to their audience. In this article, we investigate the persuasion cues related to beauty and fashion influencers present on YouTube and Instagram. More precisely, we investigate how the para-social interaction (PSI) the audience creates with the online influencer, along with their perceived credibility, are related to the purchase intention and how they are, in turn, related to the social and physical attractiveness and attitude homophily. We base our research on four beauty influencers popular in France and control our results by the age of the participants and by the influencer. We find that attitude homophily is positively related to PSI but, surprisingly, the physical attractiveness shows negative relationship or no evidence of relationship. Both credibility of the influencers and PSI exhibit significant and positive relationships to purchase intention. 相似文献
48.
随着新技术和控制系统设备的发展,变频调速技术在起重机领域得到广泛应用,为可靠调速及节能提供全新的方案。文中研究了变频调速技术在门式起重机中的应用,对变频调速系统常见故障做了归纳总结,并提出了相应的解决措施,为起重机电控系统设计及改造提供了参考。 相似文献
49.
通过融合物联网、EPC(产品电子码)、RFID(射频识别)、PML(物理标识语言)、Savant中间件等一系列新技术,研究与实现了一种Savant中间件系统,可同时读出EPC编码的多个物品的基础数据,并在进行计算后将数据存入/取出数据库。文章详细描述了使用物理标示语言(PML)从多个EPC标签中获取信息、进行计算操作、完成信息改变、及时更新数据库信息的技术过程。 相似文献
50.