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本文探讨了不恒定样本容量的产品质量控制方法。并根据实际数据,用这种方法分析了铅笔板从白板到成品的加工过程,即“软化板”过程。 相似文献
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根据统计过程控制理论,运用控制图分析和判断卷烟生产过程质量特性值是否受控,从而找出产生问题的原因,采取有效措施,达到保证、改进产品质量的目的. 相似文献
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正态性单值控制图在工序控制中的应用 总被引:2,自引:0,他引:2
在工序控制中采用传统的控制图对使用人员的文化程度有较高的要求,大多数操作工人很难做到.本文的作者在工作实践中,根据正态分布的性质,寻求了一种适合现场操作工人使用的"正态性单值控制图",供企业选用. 相似文献
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基于计量数据质量控制图的类型,即平均值軈x与R的控制图,结合实际制作计量数据控制图的步骤和方法,分析了计量数据质量控制图在实际中的的应用。 相似文献
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常规控制图是一种应用于测量过程的图形方法,是对测量过程是否处于统计控制状态的一种图形记录。控制图的实质就是区分偶然原因和异常原因两类影响因素。利用控制图能发现过程处于异常状态并起到及时警告的作用,进而对过程进行调整。本文从校准实验室质量控制的角度,应用实例从控制图的选择、控制图的建立与使用等方面详细介绍常规控制图的应用方法。 相似文献
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本文从介绍鱼骨图的基本概念出发,举出了王永庆鱼骨理论的实例,然后介绍鱼骨图的制作步骤,最后通过对构成成本的各个要素运用鱼骨分析法进行梳理,画出鱼骨分析图,从而达到成本控制的目的,并对该方法的应用进行相应的说明。 相似文献
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前言控制图是企业生产过程中常用的统计质量控制方法.Excell电子表格软件提供了丰富的数理统计函数和强大的图表功能,本文介绍了如何应用 Excell内嵌函数和图表功能来作质量控制图。 相似文献
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伍庆成 《中国高新技术企业评价》2007,(7):207-208
图论在现实生活中有着较为广泛的应用。欧拉图、哈密顿图的判定方法有多种,主要应用于解决中国邮路问题、旅行售货员问题、排座位问题、判定图是否可一笔画等。 相似文献
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Control charting is a graphical expression and operation of statistical hypothesis testing. In the present paper, we develop
the economic design of the variable sampling intervals (VSI) exponentially weighted moving average (EWMA) charts to determine
the values of the six test parameters of the charts (i.e., the sample size, the long sampling interval, the short sampling
interval, the warning limit coefficient, the control limit coefficient, and exponential weight constant) such that the expected
total cost is minimized. The genetic algorithm (GA) is applied to search for the optimal values of the six test parameters
of the VSI EWMA chart, and an example is provided to illustrate the solution procedure. A sensitivity analysis is then carried
out to investigate the effects of model parameters on the solution of the economic design. 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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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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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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Sample design and sample allocation methods are developed for random digit dialling in household telephone surveys. The proposed method is based on a two-way stratification of telephone numbers. A weighted probability proportional to size sample allocation technique is used, with auxiliary variables about the telephone coverage rates, within local telephone exchanges of each substrata. This makes the sampling design nearly “self-weighting” in residential numbers when the prior information is well assigned. A computer program generates random numbers for the local areas within the existing phone capacities. A simulation study has shown greater sample allocation gain by the weighted probabilities proportional to size measures over other sample allocation methods. The amount of dialling required to obtain the sample is less than for proportional allocation. A decrease is also observed on the gain in sample allocation for some methods through the increasing sample sizes. 相似文献
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卓德保 《世界标准化与质量管理》1999,(2):9-12
传统的过程质量控制方法都是在假定过程输出服从正态分布下进行。但在实际应用中,存在大量非正态现象。本文在对非正态分布过程控制方法分析的基础上,提出了适用范围更广、操作更简便的约翰逊曲线拟合非正态分布数据的过程控制方法。 相似文献
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举算例在保护定值计算中电流互感器变比考虑,对电流互感器变比选择进行分析探讨,提出保护整定计算对保护用电流互感器变比的选取起一定辅助作用。 相似文献