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41.
ITS研究中,动态OD矩阵估计是交通动态分配的关键因素。针对OD矩阵难以获得的问题,回顾动态OD矩阵估计理论的发展历程,明确该领域研究中的三个关键问题:状态变量的选择、系统方程的确定、OD量与路段流量的关系(分配矩阵)。在此基础上介绍一种基于历史OD矩阵数据的估计方法,卡尔曼滤波算法,为动态OD矩阵估计理论的进一步的研究奠定基础。 相似文献
42.
李创 《上海立信会计学院学报》2006,20(2):90-96
产业国际竞争力研究是当前经济领域的热点研究问题,国内外学者对其进行了大量研究,然而对其理论与分析模型的全面系统回顾却不多见。文章全面回顾了产业国际竞争力的研究现状并详细评述了其分析模型,为今后的进一步研究奠定了基础。 相似文献
43.
44.
Bonne J. H. Zijlstra Marijtje A. J. van Duijn Tom A. B. Snijders 《Statistica Neerlandica》2005,59(1):107-118
With the development of an MCMC algorithm, Bayesian model selection for the p 2 model for directed graphs has become possible. This paper presents an empirical exploration in using approximate Bayes factors for model selection. For a social network of Dutch secondary school pupils from different ethnic backgrounds it is investigated whether pupils report that they receive more emotional support from within their own ethnic group. Approximated Bayes factors seem to work, but considerable margins of error have to be reckoned with. 相似文献
45.
Sequential estimation problems for the mean parameter of an exponential distribution has received much attention over the
years. Purely sequential and accelerated sequential estimators and their asymptotic second-order characteristics have been
laid out in the existing literature, both for minimum risk point as well as bounded length confidence interval estimation
of the mean parameter. Having obtained a data set from such sequentially designed experiments, the paper investigates estimation
problems for the associatedreliability function. Second-order approximations are provided for the bias and mean squared error of the proposed estimator of the reliability
function, first under a general setup. An ad hoc bias-corrected version is also introduced. Then, the proposed estimator is
investigated further under some specific sequential sampling strategies, already available in the literature. In the end,
simulation results are presented for comparing the proposed estimators of the reliability function for moderate sample sizes
and various sequential sampling strategies. 相似文献
46.
47.
Distribution Dynamics of CO<Subscript>2</Subscript> Emissions 总被引:1,自引:0,他引:1
This paper uses nonparametric methods to examine the convergence in CO2 emissions per capita on a sample of 100 countries for the period 1966–1996. Industrial countries show a convergence pattern.
However, there is little evidence of convergence for the whole sample. 相似文献
48.
收入差距、位置消费与社会稳定 总被引:2,自引:1,他引:2
适度、合理的收入差距,不仅是激励人们竞争,促进发展的重要务件,也是位置消费产生的基本条件;但过分悬殊的收入差距则不仅会影响人们的社会心理,不利于提高有效消费,而且可能产生畸形的位置消费行为,甚至会因此影响社会的稳定.在分析和研究目前收入分配问题时,应当从位置消费的新视角研究它们对社会稳定的影响.研究位置消费有利于我们从人们相互比较的满意度中观察改革的效果,权衡各项利弊得失,并及时地采取微调措施,尽可能地减少改革的摩擦和阻力. 相似文献
49.
Choosing the sample size in advance is a familiar problem: often, additional observations appear to be desirable. The final sample size then becomes a random variable, which has rather serious consequences.
Two such sample extension situations will be considered here. In the first situation, the observed sample variance determines whether or not to double the original sample size. In the second situation, the variances observed in two independent samples are compared; their ratio determines the number of additional observations. 相似文献
Two such sample extension situations will be considered here. In the first situation, the observed sample variance determines whether or not to double the original sample size. In the second situation, the variances observed in two independent samples are compared; their ratio determines the number of additional observations. 相似文献
50.
Roberto Ren 《Economics Letters》2006,90(3):390-395
This letter introduces nonparametric estimators of the drift and diffusion coefficient of stochastic volatility models which exploit techniques for estimating integrated volatility with high-frequency data. The performance of the proposed estimators is assessed on simulations of two popular stochastic volatility models. 相似文献