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排序方式: 共有163条查询结果,搜索用时 15 毫秒
71.
Gulab Singh Bura 《统计学通讯:理论与方法》2019,48(14):3439-3450
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It is already shown in Arnold and Stahlecker (2009) that, in linear regression, a uniformly best estimator exists in the class of all Γ-compatible linear affine estimators. Here, prior information is given by a fuzzy set Γ defined by its ellipsoidal α-cuts. Surprisingly, such a uniformly best linear affine estimator is uniformly best not only in the class of all Γ-compatible linear affine estimators but also in the class of all estimators satisfying a very weak and sensible condition. This property of a uniformly best linear affine estimator is shown in the present paper. Furthermore, two illustrative special cases are mentioned, where a generalized least squares estimator on the one hand and a general ridge or Kuks–Olman estimator on the other hand turn out to be uniformly best. 相似文献
74.
We consider batch queueing systems M/MH/1 and MH/M/1 with catastrophes. The transient probability functions of these queueing systems are obtained by a Lattice Path Combinatorics approach that utilizes randomization and dual processes. Steady state distributions are also determined. Generalization to systems having batches of different sizes are discussed. 相似文献
75.
In this paper, we consider the multivariate normality test based on measure of multivariate sample skewness defined by Srivastava (1984). Srivastava derived asymptotic expectation up to the order N−1 for the multivariate sample skewness and approximate χ2 test statistic, where N is sample size. Under normality, we derive another expectation and variance for Srivastava's multivariate sample skewness in order to obtain a better test statistic. From this result, improved approximate χ2 test statistic using the multivariate sample skewness is also given for assessing multivariate normality. Finally, the numerical result by Monte Carlo simulation is shown in order to evaluate accuracy of the obtained expectation, variance and improved approximate χ2 test statistic. Furthermore, upper and lower percentiles of χ2 test statistic derived in this paper are compared with those of χ2 test statistic derived by Mardia (1974) which is used multivariate sample skewness defined by Mardia (1970). 相似文献
76.
We determine a credible set A that is the “best” with respect to the variation of the prior distribution in a neighborhood Γ of the starting prior π0(θ). Among the class of sets with credibility γ under π0, the “optimally robust” set will be the one which maximizes the minimum probability of including θ as the prior varies over Γ. This procedure is also Γ-minimax with respect to the risk function, probability of non-inclusion. We find the optimally robust credible set for three neighborhood classes Γ, the ε-contamination class, the density ratio class and the density bounded class. A consequence of this investigation is that the maximum likelihood set is seen to be an optimal credible set from a robustness perspective. 相似文献
77.
本文在问卷调查的基础上,从社会微观视角出发,以青海藏区多元文化场域的双语教育与区域发展的社会重构为主题,探析了新时期青海民族地区社会文化的多样性、区域文化的互动性、民族文化在区域利益层面的博弈性等多重社会文化样态及影响因素。着重指出:青海民族地区双语教育的拓展与推进基于多元民族文化场域中异质文化间的并存共生、良性互动与包容共享,民族地区双语教育不能忽视文化发展的多元性与多样性,共享、包容与尊重是双语教育最终取得发展的动力根源所在。 相似文献
78.
M. A. A. Cox 《统计学通讯:理论与方法》2013,42(20):5050-5057
AbstractThe adoption of control charts can be traced to the classic text by Shewhart (1931) and championed by many writers since then, including Deming (1982). Numerous other texts and publications stress the continuing importance of this area. While tables of key Shewhart control chart parameters are extremely useful they are easily lost or mislaid and can sometimes be difficult to interpret. To address this issue spreadsheet code is implemented to produce all the key control chart factors. 相似文献
79.
Zailei Cheng 《统计学通讯:理论与方法》2013,42(23):5850-5861
80.