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181.
182.
《Omega》2014
We consider resource allocation problems where inputs are allocated to different entities such as activities, projects or departments. In such problems a common goal is achieving a desired balance in the allocation over different categories of the entities. We propose a bi-criteria framework for trading balance off against efficiency. We define and categorise indicators based on balance distribution and propose formulations and solution algorithms which provide insight into the balance-efficiency tradeoff. We illustrate our models by applying them to the data of a portfolio selection problem faced by a science funding agency and to randomly generated large-sized problem instances to demonstrate computational feasibility. 相似文献
183.
Ngoc Khue Tran 《统计学通讯:理论与方法》2017,46(16):7942-7968
In this article, we consider an ergodic Ornstein–Uhlenbeck process with jumps driven by a Brownian motion and a compensated Poisson process, whose drift and diffusion coefficients as well as its jump intensity depend on unknown parameters. Considering the process discretely observed at high frequency, we derive the local asymptotic normality property. To obtain this result, Malliavin calculus and Girsanov’s theorem are applied to write the log-likelihood ratio in terms of sums of conditional expectations, for which a central limit theorem for triangular arrays can be applied. 相似文献
184.
通过对高校思想政治理论课教学的评价、学生对该课的参与程度,以及该课教学中存在的问题、改进意见和建议等情况进行调查,结果显示,教学内容、教师素质、教学方式是影响当前高校思想政治理论课教学效果的三个主要方面。 相似文献
185.
A comparison of maximum likelihood and least squares for the estimation of a cumulative distribution
《Journal of Statistical Computation and Simulation》2012,82(3-4):229-239
Monte Carlo methods are used to compare the methods of maximum likelihood and least squares to estimate a cumulative distribution function. When the probabilistic model used is correct or nearly correct, the two methods produce similar results with the MLE usually slightly superior When an incorrect model is used, or when the data is contaminated, the least squares technique often gives substantially superior results. 相似文献
186.
Xiang Zhang 《Journal of nonparametric statistics》2014,26(2):321-340
Multivariate density estimation plays an important role in investigating the mechanism of high-dimensional data. This article describes a nonparametric Bayesian approach to the estimation of multivariate densities. A general procedure is proposed for constructing Feller priors for multivariate densities and their theoretical properties as nonparametric priors are established. A blocked Gibbs sampling algorithm is devised to sample from the posterior of the multivariate density. A simulation study is conducted to evaluate the performance of the procedure. 相似文献
187.
Jianlan Zhong 《统计学通讯:模拟与计算》2017,46(1):106-126
The close relationship between quality and maintenance of manufacturing systems has contributed to the development of integrated models which use the concept of statistical process control (SPC) and maintenance. This article demonstrates the integration of the Shewhart individual-residual (ZX ? Ze) joint control chart and maintenance for two-stage dependent processes by jointly optimizing their policies to minimize the expected total costs associated with quality, maintenance and inspection. To evaluate the effectiveness of the proposed model, two stand-alone models—a maintenance model and an SPC model—are proposed. Then a numerical example is given to illustrate the application of the proposed integrated model. The results show that the integrated model outperforms the two stand-alone models with regard to the expected cost per unit time. Finally, a sensitivity analysis is conducted to develop insights into time parameters and cost parameters that influence the integration efforts. 相似文献
188.
当代大学生作为社会中的重要群体,他们需要与外界的交往,处理关系,如何建立,发展,巩固这种关系,就要靠沟通来完成。在高校中,针对大学生的思想政治教育过程就是一个如何与他们沟通的过程。面对当下个性彰显,不断追求新事物的年轻群体,怎样把握沟通的要素和形式,它有哪些特点和功能,遵循什么样的原则和策略,以及新时期下师生沟通过程中出现的障碍和问题,正是本文要探讨的内容。 相似文献
189.
1958年余江县在全国率先消灭血吸虫病,树立了全国“第一面血防红旗”,创造了世界血防奇迹。作为地域社会发生的重大历史事件,血防对余江县域政治演变产生了深刻影响。研究表明:高层领导对血防持续不断的关注和督促,为余江血防注入了源源不断的政治压力和政治变迁动力;历届县委、县政府都把血防作为“一把手工程”,视为“最大的政治”,使余江县域政治带有浓厚的“血防”色彩;县党政机构也发生相应变化,完成了血防领导机构的常规化和党政机构的血防化;余江是我国出台血防政令最多的县份之一,血防在余江县政治生活中占有极其重要的地位。血防塑造了余江地域政治特色,它使得余江县域政治带有明显的血防化特征。 相似文献
190.
《Journal of Statistical Computation and Simulation》2012,82(8):1621-1643
When a spatial point process model is fitted to spatial point pattern data using standard software, the parameter estimates are typically biased. Contrary to folklore, the bias does not reflect weaknesses of the underlying mathematical methods, but is mainly due to the effects of discretization of the spatial domain. We investigate two approaches to correcting the bias: a Newton–Raphson-type correction and Richardson extrapolation. In simulation experiments, Richardson extrapolation performs best. 相似文献