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161.
Anita Singh 《统计学通讯:模拟与计算》2013,42(6):611-619
The exact null distribution of the likelihood ratio criter- 2 ion for testing the hypothesis H: y = y~; z = a I, a unknown and UQ a given known vector against the alternative A =f H in a p-vari- ate normal population N (y,z) has been derived in the form of Meijer's G-function using mellin integral transform and also in a chisquare series form. Asymptotic behavior of the distribution of -2 log L has also been discussed. Percentage points for p=2(l)10for various level of significance and various degrees of freedom have been computed, but only selected tables have been presented in this paper. 相似文献
162.
Thomas P. Ryan 《统计学通讯:理论与方法》2013,42(9-10):2019-2032
Much research has been performed in the area of multiple linear regression, with the resuit that the field is well-developed. This is not true of logistic regression, however. The latter presents special problems because the response is not continuous. Some of these problems are: the difficulty of developing a suitable R2 statistic, possibly poor results produced by the method of maximum likelihood, and the challenge to develop suitable graphical techniques. We describe recent work in some of these directions, and discuss the need for additional research. 相似文献
163.
A. K. Gupta 《统计学通讯:模拟与计算》2013,42(4):177-188
In this paper, the exact distribution of Wilks' likelihood ratio criterion, A, for MANOVA, in the complex case when the alternate hypothesis is of unit rank (i.e. the linear case) has been derived and the explicit expressions for the same for p = 2 and 3 (where p is the number of variates) and general f1 (the error degrees of freedom) and f2 (the hypothesis degrees of freedom), are given. For an unrestricted number of variables, a general form of the density and the distribution of A in this case, is also given. It has been shown that the total integral of the series obtained by taking a few terms only, rapidly approaches the theoretical value one as more terms are taken into account, and some percentage points have also been computed. 相似文献
164.
André Rogatko 《统计学通讯:理论与方法》2013,42(5):1441-1462
A new method to perform meta - analysis of controlled clinical trials with binary response variable is developed using a Bayesian approach. It consists of three parts: (1) For each trial, the risk difference (the proportion of successes in the treated group minus the proportion of successes in the control group) is estimated; (2) The homogeneity of the risk difference among the different trials is tested; and (3) The hypothesis - the effect of the treatment for the homogeneous pool of trials is greater than or equal to a given fixed constant - is tested. The performance of the Bayesian procedure to test the homogeneity of the risk difference among trials is compared with the chi - square test proposed by DerSimonian and Laird (Controlled Clinical Trials 7, 177-188, 1986) by means of pseudo - random simulation. The conclusion was that the Bayes test is more reliable, either in its exact or asymptotic versions, since it makes fewer decision errors than the chi-square test. As an illustration, the Bayesian method is applied to data of chemotherapeutic prophylaxis of superficial bladder cancer. 相似文献
165.
米洪义 《西华师范大学学报(自然科学版)》2000,(4)
世纪之交 ,高校思想政治工作面临很多新情况、新问题。教育者应适应形势的需要 ,在思想政治教育工作内容的针对性与方法的有效性上做文章 ,积极探索思想政治教育工作的新途径、新方法 相似文献
166.
In this paper we consider from maximum likelihood and Bayesian points of view the generalized growth curve model when the covariance matrix has a Toeplitz structure. This covariance is a generalization of the AR(1) dependence structure. Inferences on the parameters as well as the future values are included. The results are illustrated with several real data sets. 相似文献
167.
Ingrid K. Glad Nils Lid Hjort Nikolai G. Ushakov 《Scandinavian Journal of Statistics》2003,30(2):415-427
Abstract. Several old and new density estimators may have good theoretical performance, but are hampered by not being bona fide densities; they may be negative in certain regions or may not integrate to 1. One can therefore not simulate from them, for example. This paper develops general modification methods that turn any density estimator into one which is a bona fide density, and which is always better in performance under one set of conditions and arbitrarily close in performance under a complementary set of conditions. This improvement-for-free procedure can, in particular, be applied for higher-order kernel estimators, classes of modern h 4 bias kernel type estimators, superkernel estimators, the sinc kernel estimator, the k -NN estimator, orthogonal expansion estimators, and for various recently developed semi-parametric density estimators. 相似文献
168.
首次建立了音圈电机(VCM)的精确模型,通过计算机模拟,分析了VCM的动态特性;同时一改传统的VCM设计方法,提出以最快响应为目标函数对VCM进行优化设计,从面使优化结果更加切合实际。 相似文献
169.
We propose a simple and robust algorithm for exact inference in 2 × 2 contingency tables. It is based on recursive relations allowing efficient computation of odds-ratio estimates, confidence limits and p-values for Fisher's test. A factor of 3–10 is gained in terms of computer time compared with the classical algorithm of Thomas. 相似文献
170.
Giorgio Pederzoli 《统计学通讯:理论与方法》2013,42(1):185-194
Consider a set of r+1 independently and identically and uniformly distributed random points X0, X1,…,Xr in RnThese points determine almost surely via their convex hull a unique r-simplex in Re This article deals with the exact density of the r-content of this random r-simplex when the points are such that p of them are in the interior and r+l?p of them are on the surface of a unit n-ball. This problem is transformed into a distribution problem connected with multivariate test statistics. Various possible representations of the exact density in the general case, are also pointed out. 相似文献