共查询到20条相似文献,搜索用时 0 毫秒
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This paper is concerned with multivariate generalizations of two–sample rank tests, the bivariate Wilcoxon test in particular. 相似文献
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粮食质量检验是粮食工作的重要组成部分,提高检测结果的准确性为保障人民群众吃上安全放心的粮食提供重要的依据。本文在多年粮食检测工作的基础上,对粮食检测过程中应注意的事项进行总结分析,为确保粮食质量检验结果的准确性提出浅显的见解。 相似文献
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In this paper, we develop exact confidence intervals and exactjoint confidence regions for the parameters of the Gompertzdistribution under the doubly type II censored sample. We alsoprovide optimal criteria for finding a best exact confidenceinterval and a best exact joint confidence region among theseinterval estimations. Finally, we give a numerical example toillustrate our proposed method. Furthermore,when compared to estimation of Chen (1997), our proposedmethod can get a better parameter estimation. 相似文献
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The Effect of Sample Size on the Mean Efficiency in DEA with an Application to Electricity Distribution in Australia,Sweden and New Zealand 总被引:1,自引:0,他引:1
This study examines the effect of sample size on the mean productive efficiency of firms when the efficiency is evaluated using the non-parametric approach of Data Envelopment Analysis. By employing Monte Carlo simulation, we show how the mean efficiency is related to the sample size. The paper discusses the implications for international comparisons. As an application, we investigate the efficiency of the electricity distribution industries in Australia, Sweden and New Zealand. 相似文献
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贾刘丰 《世界标准化与质量管理》2010,(8):66-67
文章提出了一种新的作业管理方法。此方法以首件加工的产品作为封样,确定批次产品的实物检验标准,以此规范操作者、质检员、工艺技术员、设备维修工、生产管理人员等生产过程诸影响因素的行为,以促进产品质量和工作质量的整体提升。 相似文献
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地铁备品备件的需求量预测有利于备件储备决策质量的提高,但是大量少样本备件的需求量预测不能采用常规的统计方法,经典贝叶斯预测模型有效利用先验信息进行预测,但是需要较多的数据,操作复杂,结果误差值较大。文章基于样本数据,通过实验的方式调整贝叶斯预测模型参数的计算方法,降低了数据要求,简化了贝叶斯模型操作的复杂程度,也提高了预测的精确度,在一定程度上提高了地铁备件管理的效率。 相似文献
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金在矿石中大多数以单质形式存在,常与各种矿物或矿石伴生,以金为主的矿石也常常伴生着银、锑、砷、铁、硫、碳等,目前,测定矿石中金含量的方法很多,本文就近代岩矿中金元素的测试分析技术作了较为全面的介绍,并综合总结了其优缺点。 相似文献
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Zhang and Bartels (1998) show formallyhow DEA efficiency scores are affected by sample size. They demonstratethat comparing measures of structural inefficiency between samplesof different sizes leads to biased results. This note arguesthat this type of sample size bias has much wider implicationsthan suggested by their example. Models which implicitly restrictthe comparison set like some models for non-discretionary variableslead to biased efficiency scores as well. A reanalysis of theBanker and Morey (1986b) data shows that the efficiency scoresderived there are significantly influenced by the variation insample size implicit in their model. 相似文献
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通过分析SystemView仿真软件的优势及主要的功能模块库和应用领域,重点通过通信系统中的抽样定理实例介绍了该软件的使用方法及注意事项。最后,总结该软件的教学应用效果及对相关课程教学的借鉴作用,特别适合通信系统的仿真与设计。 相似文献
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在一定精度的要求下,对产品合格率试验中样本容量的计算应用参数估计中的贝叶斯方法进行研究,并对贝叶斯估计方法与矩估计法作一比较,目的是为了减少用作实验的样本容量,并介绍如何使用利用计算机模拟实验抽样检验,确定样本容量的方法。 相似文献
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Shu-Fei Wu 《Quality and Quantity》2007,41(3):489-496
The interval estimation of the scale parameter and the joint confidence region of the parameters of two-parameter exponential
distribution under doubly Type II censoring is proposed. In addition, the simulation study for the performance of our methods
is done in this paper. One biometrical example is also given to illustrate the proposed methods. 相似文献
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本文通过以京东商城为例,提出京东商城的移动商务与物流配送在配套合作中所采取的策略及存在的问题,分析其原因。旨在解决对于发展移动商务业务的企业,如何做好企业与物流配送的最优策略选择,增强企业竞争力。 相似文献
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The conditional variance of random variables plays an important role for well-known variance decomposition formulas. In this paper, the conditional variance is defined for fuzzy random variables and some properties are proved, which especially generalize to the mentioned variance decomposition. Moreover, results for two special types of fuzzy random variables and an outlook for possible applications are presented. 相似文献
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Nigm et al. (2003, statistics 37: 527–536) proposed Bayesian method to obtain predictive interval of future ordered observation Y
(j) (r < j≤ n ) based on the right type II censored samples Y
(1) < Y
(2) < ... < Y
(r) from the Pareto distribution. If some of Y
(1) < ... < Y
(r-1) are missing or false due to artificial negligence of typist or recorder, then Nigm et al.’s method may not be an appropriate
choice. Moreover, the conditional probability density function (p.d.f.) of the ordered observation Y
(j) (r < j ≤ n ) given Y
(1) <Y
(2) < ... < Y
(r) is equivalent to the conditional p.d.f. of Y
(j) (r < j ≤ n ) given Y
(r). Therefore, we propose another Bayesian method to obtain predictive interval of future ordered observations based on the
only ordered observation Y
(r), then compares the length of the predictive intervals when using the method of Nigm et al. (2003, statistics 37: 527–536) and our proposed method. Numerical examples are provided to illustrate these results. 相似文献
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目的:使卫生统计信息网络直报工作顺利实施,充分发挥网络直报的作用。使卫生统计信息网络直。方法:结合具体的工作实际和管理经验,对卫生统计网络直报工作进行了深入思考,从统计方式、统计制度、人的主观能动性、计算机技术运用、统计质量提高等多个方面进行了系统思考。结果:要处理好人与计算机的关系,扎实做好各项基础工作是保证网络直报顺利进行的重要环节。结论:网络直报不只是技术的变化,更是统计制度的完善。 相似文献
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This paper describes Bayesian methods for life test planning with Type II censored data from a Weibull distribution, when the Weibull shape parameter is given. We use conjugate prior distributions and criteria based on estimating a quantile of interest of the lifetime distribution. One criterion is based on a precision factor for a credibility interval for a distribution quantile and the other is based on the length of the credibility interval. We provide simple closed form expressions for the relationship between the needed number of failures and the precision criteria. Examples are used to illustrate the results.Received: October 2002 / Revised: March 2004 相似文献
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In this article, we establish some general results concerning the comparison of the amount of the Fisher information contained in n record values with the Fisher information contained in n iid observations from the original distribution. Some common distributions are classified according to this criterion. We also propose some methods of estimation based on record values. The results may be of interest in some life testing problems. Received: September 1999 相似文献