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本文应用动态规划的原理,讨论了多期投资决策中基于总收益率最大的交易策略的设计和实现问题。通过比较随机交易方法、局部最优方法和全局最优方法下的投资表现,在交易费用存在的情况下,基于动态规划的算法给出问题的全局最优解,该方法的优越性随着交易费用的增长而加强。 相似文献
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Lp空间上线性回归方程回归系数的估计 总被引:1,自引:1,他引:1
徐龙封 《数量经济技术经济研究》2005,22(10):118-124
本文讨论了多元线性回归方程参数的L^p估计问题。首先采取消除方程中参数“。的技术,化参数估计为对回归系数的估计,然后进一步将问题转化为一个单目标数学规划模型,利用能自动搜索最优解的电脑软件,十分方便地求出规划模型的最优解。特别对一元回归方程,在消除参数a0后,还可以直接利用普通一元函数求极值的方法,求出回归系数的估计。 相似文献
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We solve the stochastic neoclassical growth model, the workhorse of modern macroeconomics, using C++14, Fortran 2008, Java, Julia, Python, Matlab, Mathematica, and R. We implement the same algorithm, value function iteration, in each of the languages. We report the execution times of the codes in a Mac and in a Windows computer and briefly comment on the strengths and weaknesses of each language. 相似文献
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This note introduces the concept of symbolic regression (SR) to tourism and hospitality research. SR uses genetic programming to find the model that best fits the data without a need to pre-specify a functional form or to impose a certain model as a starting point. In other words, SR helps to uncover the intrinsic characteristics of the data at hand. Our view is that SR can serve as an improved method of testing for misspecification. In this note, we propose to derive the true functional form of the residual using SR. We then use this information to improve the forecasts of the linear regression model and, to perform hypothesis tests if needed. 相似文献
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In this paper, we propose a goal-based investment model that is suitable for personalized wealth management. The model only requires a few intuitive inputs such as size of wealth, investment amount, and consumption goals from individual investors. In particular, a priority level can be assigned to each consumption goal and the model provides a holistic solution based on a sequential approach starting with the highest priority. This allows strict prioritization by maximizing the probability of achieving higher priority goals that are not affected by goals with lower priorities. Furthermore, the proposed model is formulated as a linear program that efficiently finds the optimal financial plan. With its simplicity, flexibility, and computational efficiency, the proposed goal-based investment model provides a new framework for automated investment management services. 相似文献
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Nigel Brown 《Accounting Education: An International Journal》2013,22(2):159-175
Meta programmes are a means of describing the behavioural traits that a person exhibits when interacting with other people. An understanding of meta programmes can improve communication between individuals and this may have implications for teaching. The purposes of this study are first to identify the dominant meta programme patterns of first year accounting undergraduates at a UK business school. An earlier pilot study validated use of the Motivation Profile Questionnaire (MPQ) to elicit the dominant meta programmes of accounting lecturers at the same Business School (Brown, 2002). Secondly, the students' meta programmes are compared with those of their accounting teachers to identify whether there are any differences or similarities between the two groups. The matching of the meta programmes of the teachers and students would enhance communication whilst major differences in meta programmes would make communication more difficult. A sample of 62 first year accounting undergraduates and 20 accountancy teachers completed the MPQ. The results indicate that, on average, the accounting students have similar dominant meta programme patterns to their accounting teachers. The implications of the findings for improving communication and therefore teaching are discussed, along with the scope for further research. 相似文献
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沙漠是一种特殊的旅游资源,在国际上,沙漠旅游正成为一种新兴的旅游方式.和田地区是典型的干旱区,沙漠旅游资源均为独一无二的精品,特色突出,蕴藏着巨大的开发价值.本文阐述了和田地区沙漠旅游资源的特点,并探讨了沙漠旅游资源在开发利用中存在的问题.重点推出开发麻扎塔格风景区、大河沿-达里亚博依民俗文化以及尼雅寻古等景点景区.并... 相似文献
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换乘所产生的附加费用,如时间和票价等,导致配流影响因素产生变化,如果沿用传统方式将降低预测精度和可靠性。通过引入换乘次数和方式等因子计算出行等待、乘车、换乘及风险评估预留时间等,定义广义出行费用与计算方法;建立双层规划模型求解最优票价,最后通过算例分析弹性出行需求、换乘费用、票价之间的关系。计算结果表明,换乘费用对出行需求的影响小于票价优化对出行需求的影响,优化票价随换乘费用增加而加速降低,为公共交通票价优化提供研究依据。 相似文献