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51.
自动电位滴定仪测定磁性材料1YC8中钴的测量不确定度评定 总被引:2,自引:0,他引:2
采用自动电位滴定仪测定磁性材料1YC8中钴含量,建立了测量过程分量的数学模型,分析了测量过程不确定度来源及各不确定度分量对总不确定度的影响,确定了测定结果的置信区间。给出磁性材料1YC8中钴的含量及其置信区间为10.92%±0.07%。 相似文献
52.
本文讨论了对定序变量进行回归的技术,并探讨了如何用其解决消费者信心指数调查中抽样的重要问题。最后的结论来自对第一手数据的分析。 相似文献
53.
The problem of simultaneous estimation of the regression parameters in a multiple regression model with measurement errors is considered when it is suspected that the regression parameter vector may be the null-vector with some degree of uncertainty. In this regard, we propose two sets of four estimators, namely, (i) the unrestricted estimator, (ii) the preliminary test estimator, (iii) the Stein-type estimator and (iv) the postive-rule Stein-type estimator. In an asymptotic setup, properties of these estimators are studied based on asymptotic distributional bias, MSE matrices, and risks under a quadratic loss function. In addition to the asymptotic dominance of the Stein-type estimators, the paper contains discussion of dominating confidence sets based on the Stein-type estimation. Asymptotic analysis is considered based on a sequence of local alternatives to obtain the desired results. 相似文献
54.
Paul Kabaila 《Computational Statistics》2005,20(3):401-414
Suppose that the data have a discrete distribution determined by (∞, ψ) where θ is the scalar parameter of interest and ψ
is a nuisance parameter vector. The Buehler 1 - α upper confidence limit for θ is as small as possible, subject to the constraints
that (a) its coverage probability is at least 1 - α and (b) it is a nondecreasing function of a pre-specified statisticT. This confidence limit has important biostatistical and reliability applications. The main result of the paper is that for
a wide class of models (including binomial and Poisson), parameters of interest 9 and statisticsT (which possess what we call the “logical ordering” property) there is a dramatic increase in the ease with which this upper
confidence limit can be computed. This result is illustrated numerically for θ a difference of binomial probabilities. Kabaila
& Lloyd (2002) also show that ifT is poorly chosen then an assumption required for the validity of the formula for this confidence limit may not be satisfied.
We show that for binomial data this assumption must be satisfied whenT possesses the “logical ordering” property. 相似文献
55.
论文基于响应数据,应用鞍点近似方法,给出构造Logistic响应分布分位数的近似置信区间的方法. 论文还对这种置信区间进行了模拟,并将该方法应用于QD8电雷管. 模拟和实例结果表明,当样本量较小时,该方法能够较好地推断Logistic响应分布的分位数 相似文献
56.
We consider a very general class of empirical statistics that includes (a) empirical discrepancy (ED) statistics, (b) generalized
empirical exponential family likelihood statistics, (c) generalized empirical likelihood statistics, (d) empirical statistics
arising from Bayesian considerations, and (e) Bartlett-type adjusted versions of ED statistics. With reference to this general
class, we investigate higher order asymptotics on power and expected lengths of confidence intervals. For (b)-(e), such results
have been hitherto unexplored. Furthermore, our findings help in understanding the presently known results on the subclass
(a) from a wider perspective. 相似文献
57.
模糊条件下的决策单元相对有效性评价 总被引:5,自引:0,他引:5
研究了模糊条件下决策单元的相对有效性评价问题。首先分析了模糊性因素对决策单元相对有效性的影响;然后根据模糊规划取截集方法和DEA评价的经济含义,给出了模糊DEA模型的求解方法;最后定义了决策单元的模糊DEA有效性以及进行有效性排序的平均置信有效性。文末是一个模糊DEA应用的例子。 相似文献
58.
对于定数截尾样本,给出了基于极值分布的位置和尺度参数的最好线性无偏估计(BLUE),获得了威布尔分布的可靠度的点估计和置信限之间的回归模型,从而可由威布 尔可靠度的点估计根据回归方程得到可靠度的置信下限,省去了大量的用表,为实际工作者带来了极大的方便,计算结果表明,回归方程有很高的精度。 相似文献
59.
In this paper we consider stochastic programming problems where the objective function is given as an expected value function. We discuss Monte Carlo simulation based approaches to a numerical solution of such problems. In particular, we discuss in detail and present numerical results for two-stage stochastic programming with recourse where the random data have a continuous (multivariate normal) distribution. We think that the novelty of the numerical approach developed in this paper is twofold. First, various variance reduction techniques are applied in order to enhance the rate of convergence. Successful application of those techniques is what makes the whole approach numerically feasible. Second, a statistical inference is developed and applied to estimation of the error, validation of optimality of a calculated solution and statistically based stopping criteria for an iterative alogrithm. © 1998 The Mathematical Programming Society, Inc. Published by Elsevier Science B.V.Supported by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), Brasília, Brazil, through a Doctoral Fellowship under grant 200595/93-8. 相似文献
60.
缺失数据下WEIBULL分布的统计推断 总被引:4,自引:0,他引:4
本文给出了定数截尾缺失数据下Weibull分布参数的点估计和区间估计以及可靠度、失效率的置信限。 相似文献