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21.
Maximum likelihood estimators are investigated a for lr-out-of 2:G repairable system when failures and repairs are statistically dependent. Under two censoring schemes Accelerated Life Testing Procedure (ALTP) is used to obtain the estimates. Information matrices are supplied and a special case when the failure and repair phenomenon are independent of each other is considered. 相似文献
22.
Neil A. Butler Roger Mead Kent M. Eskridge & Steven G. Gilmour 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2001,63(3):621-632
There has been much recent interest in supersaturated designs and their application in factor screening experiments. Supersaturated designs have mainly been constructed by using the E ( s 2 )-optimality criterion originally proposed by Booth and Cox in 1962. However, until now E ( s 2 )-optimal designs have only been established with certainty for n experimental runs when the number of factors m is a multiple of n-1 , and in adjacent cases where m = q ( n -1) + r (| r | 2, q an integer). A method of constructing E ( s 2 )-optimal designs is presented which allows a reasonably complete solution to be found for various numbers of runs n including n ,=8 12, 16, 20, 24, 32, 40, 48, 64. 相似文献
23.
By means of an example it is shown how eigenvalues and eigenvectors of variance components models can be obtained straightforwardly when balanced data are available. Simple asymptotically efficient estimators of the variance components are presented. 相似文献
24.
Mervyn G. Marasinghe 《统计学通讯:理论与方法》2013,42(9):2219-2231
Several authors have proposed approximations to percentage points required for testing certain hypotheses associated with the multiplicative interaction model. Alternative approximations based on the asymptotic joint distribution of the characteristic roots of a noncentral Wishart matrix are proposed in this paper. The type I error rates of the resulting tests and the existing procedures are then compared using Monte Carlo methods. 相似文献
25.
非负矩阵谱半径的新估计 总被引:4,自引:0,他引:4
袁抗 《湛江师范学院学报》2006,27(3):30-32
对于非负矩阵的谱半径进行研究,分析了文[1,2]中的结果,给出了非负矩阵谱半径的新估计,该结果改进了文[1,2]中的相关结果. 相似文献
26.
伍启期 《佛山科学技术学院学报(社会科学版)》1996,(2)
给出了3度平面图的两个存在性定理的简洁证明,以矩阵列举法迅速得到所有的异构类,并举例说明结论的意义. 相似文献
27.
28.
A control procedure is presented in this article that is based on jointly using two separate control statistics in the detection and interpretation of signals in a multivariate normal process. The procedure detects the following three situations: (i) a mean vector shift without a shift in the covariance matrix; (ii) a shift in process variation (covariance matrix) without a mean vector shift; and (iii) both a simultaneous shift in the mean vector and covariance matrix as the result of a change in the parameters of some key process variables. It is shown that, following the occurrence of a signal on either of the separate control charts, the values from both of the corresponding signaling statistics can be decomposed into interpretable elements. Viewing the two decompositions together helps one to specifically identify the individual components and associated variables that are being affected. These components may include individual means or variances of the process variables as well as the correlations between or among variables. An industrial data set is used to illustrate the procedure. 相似文献
29.
Amir Ahmadi-Javid 《统计学通讯:理论与方法》2013,42(8):1352-1362
This article presents some results showing how rectangular probabilities can be studied using copula theory. These results lead us to develop new lower and upper bounds for rectangular probabilities which can be computed efficiently. The new bounds are compared with the ones obtained from the generalized Fréchet–Hoeffding bounds and Bonferroni-type inequalities. 相似文献
30.