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141.
This paper puts forward a Poisson-generalized Pareto （Poisson-GP） distribution. This new form of compound extreme value distribution expands the existing application of compound extreme value distribution, and can be applied to predicting financial risk, large insurance settlement and high-grade earthquake, etc. Compared with the maximum likelihood estimation （MLE） and compound moment estimation （CME）, probability-weighted moment estimation （PWME） is used to estimate the parameters of the distribution function. The specific formulas are presented. Through Monte Carlo simulation with sample sizes 10, 20, 50, 100, 1 000, it is concluded that PWME is an efficient method and it behaves steadily. The mean square errors （MSE） of estimators by PWME are much smaller than those of estimators by CME, and there is no significant difference between PWME and MLE. Finally, an example of foreign exchange rate is given. For Dollar/Pound exchange rates from 1990-01-02 to 2006-12-29, this paper formulates the distribution function of the largest loss among the investment losses exceeding a certain threshold by Poisson-GP compound extreme value distribution, and obtains predictive values at different confidence levels. 相似文献
142.
徐启龙 《四川教育学院学报》2008,24(1):66-69
我国高校十分重视多媒体技术在外语教学中的推广和应用。然而迄今为止,高校多媒体外语教学显然不尽人意,优势效果还未完全充分展现出来。文章从语言经济学的视角,运用成本效益研究的方法,探讨了我国高校多媒体网络外语教学存在的问题,提出了优化媒体外语教学的措施。希望探讨有助于促进外语教学效率、效益与整个外语教育质量的提高。 相似文献
143.
中国社会养老保险制度改革的帕累托有效性研究 总被引：2，自引：0，他引：2
假定改革不影响人均产出,则中国社会养老保险制度改革是零和博弈,改革仅在代际间进行收入再分配。所以中国社会养老保险制度改革能否带来帕累托改进取决于改革能否提高人均产出。改革前后人均产出水平高低决定因素包括人口增长率、资本对产出的贡献份额、原现收现付制度下养老保险费率、部分积累制社会统筹部分养老保险费率和退休期效用折算到工作期所采用的折算率。 相似文献
144.
我国的代议制民主经过了一系列的制度变迁,形成了具有中国特色的代议制民主政体--人民代表大会制度;我国现行的人民代表大会制度作为我国政治民主化进程中所取得的重要成果,还处在不断发展和完善的过程之中,不可避免地会表现出制度非均衡的种种迹象;只有不断进行制度创新,才能实现我国代议制民主"帕累托最优"的理想状态. 相似文献
145.
Causal judgments of positive mood in relation to self-regulation: A case study with Flemish students
To examine students’ causal judgements of positive mood in relation to self-regulation, 128 participants from two different schools representing two distinct educational environments (Technical/Vocational School (TSO/BSO): N = 63; General Secondary School (ASO): N = 65) were asked to judge 45 statements containing three possible relationships (A → B; A ← B; A <> B) for all iterations of 5 constructs associated with positive mood, namely Hope, Optimism, Resilience, Confidence, Persistence, 4 constructs associated with self-regulation, namely Motivation, Social support, Problem-solvingLearning goals, and 1 construct representing Academic performance. Based on a Pareto analysis, mental models were constructed for each school. An analysis of the mental models indicates that all students believe positive mood constructs to be causally related to self-regulation constructs with Academic performance identified as the main driver and Learning goals as the primary outcome for both schools. It is concluded that an appreciation of participants’ causal attributions of positive mood states in relation to self-regulation can present a clearer picture of the conditions under which participants’ causal understanding of positive mood and self-regulation constructs can be activated and used as an interpretive and evaluative framework in learning encounters. 相似文献
146.
利用一些学者提出的研究全局优化问题的全局最优性条件的新方法,讨论一些带有二次约束的特殊非凸多项式规划问题的全局最优性条件。通过利用拉格朗日函数和L-次微分相结合的方法,给出带不等式约束的多项式规划的全局最优性充分条件,并推广了已有文献中的一些结论;最后举例说明如何利用所给出的全局最优性充分条件来判定当前可行解就是全局最优解。 相似文献
147.
B—预凸函数是一类广义凸函数,该文推广了B—预凸函数的定义,给出了一类新的函数B—致凸函数的定义,在约束函数和目标函数都是B—致凸的条件下讨论了一类可微多目标规划的最优性条件,其结论具有一般性,推广了许多文献中关于B—预凸函数的结果。 相似文献