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Most studies in the structural change literature focus solely on the conditional mean, while under various circumstances, structural change in the conditional distribution or in conditional quantiles is of key importance. This paper proposes several tests for structural change in regression quantiles. Two types of statistics are considered, namely, a fluctuation type statistic based on the subgradient and a Wald type statistic, based on comparing parameter estimates obtained from different subsamples. The former requires estimating the model under the null hypothesis, and the latter involves estimation under the alternative hypothesis. The tests proposed can be used to test for structural change occurring in a pre-specified quantile, or across quantiles, which can be viewed as testing for change in the conditional distribution with a linear specification of the conditional quantile function. Both single and multiple structural changes are considered. We derive the limiting distributions under the null hypothesis, and show they are nuisance parameter free and can be easily simulated. A simulation study is conducted to assess the size and power in finite samples. 相似文献
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从制度经济学角度分析非法集资产生的原因 总被引:1,自引:0,他引:1
非法集资在中国已经有数十年的历史,尽管公安部门、金融监管部门以及工商行政管理部门曾多次联手打击,却仍屡禁不止。本文试图从信息经济学角度分析其产生的原因,提出预防、惩治非法集资的对策建议。 相似文献
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通过实证研究,本文认为相对于限价委托,市价委托方式更为常用。市场行情越不稳定,交投越活跃,投资者越倾向于采用市价委托。市价委托的主要风险在于可能引起产生股价大幅变动,本文通过价格波动与成交效率两个角度进行比较,认为最优五档成交转限价和最优五档成交并撤销方案应是在市场现有基础上推出市价委托的首选方案。 相似文献
117.
China’s inbound tourism currently faces a tough choice between a niche strategy and a wide-range tourist attraction. The derivative concept of ‘leverageable market’ provides a reasonable method to solve the problem. This study, thus, attempts to conduct market segmentation for identifying a core crowd in the leisure tourism market of US near-venturers that leverages revitalization. A mixed segmentation method was adopted that combined ‘a posterior approach’ with ‘a priori approach’ in an overall multi-stage framework. ‘Venturesomeness’ in Plog’s psychographic model was the first principle segmentation variable used, which is intrinsically pertinent to the connotation of a leverageable market. ‘Activity participation’ was added to further partition the near-venturers identified, yielding refined management strategies. The data first indicated an obvious shift of China’s psychographic destination position from ‘near-venturer’ to ‘mid-centric’. Cluster analysis further identified four activity-based near-venturer segments: outdoor stimulus experiencers, recreation and amusement seekers, culture searchers, and extensive interest holders. Significant socio-demographic and trip-related features were found among the clusters. The corresponding managerial and theoretical implications, limitations, and agendas for further related research were finally discussed. 相似文献
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In many common law jurisdictions, the common law power of courts to grant assistance in respect of foreign insolvency proceedings exists independently of statute. The nature of the power, however, continues to generate debate. Obiter dicta of the Privy Council suggests that no assistance is available where the foreign proceeding is a voluntary winding‐up. This article evaluates the position by reference to Singapore and Hong Kong decisions and concludes that a refusal to grant assistance in circumstances involving an insolvent voluntary winding‐up is inconsistent with the principle of modified universalism and that a broader recognition test should be adopted. 相似文献
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曲爱平 《石油工业技术监督》1999,15(8):30-33
压力容器的常规设计中,安全系数的确定完全是按经验估计的,具有较大的随意性.通过应用可靠性设计的基本方法,将压力容器的壁厚设计与允许破坏概率(或可靠度)联系起来,并与常规设计结果进行了比较.结果表明,常规设计规范中建议采用的安全系数通常偏大,偏于保守.为此,讨论了一种简便而实用的设计方法,即在常规设计公式中,以可靠性安全系数代替传统的经验安全系数,由此将安全系数的确定建立在容器允许破坏概率(或可靠度)的基础之上,从而使设计的压力容再在保证足够的可靠性前提下,尽量作到经济合理. 相似文献