CO-tucker: a new method for the simultaneous analysis of a sequence of paired tables

Relationships between species and their environment are a key component to understand ecological communities. Usually, this kind of data are repeated over time or space for communities and their environment, which leads to a sequence of pairs of ecological tables, i.e. multi-way matrices. This work proposes a new method which is a combined approach of STATICO and Tucker3 techniques and deals to the problem of describing not only the stable part of the dynamics of structure–function relationships between communities and their environment (in different locations and/or at different times), but also the interactions and changes associated with the ecosystems’ dynamics. At the same time, emphasis is given to the comparison with the STATICO method on the same (real) data set, where advantages and drawbacks are explored and discussed. Thus, this study produces a general methodological framework and develops a new technique to facilitate the use of these practices by researchers. Furthermore, from this first approach with estuarine environmental data one of the major advantages of modeling ecological data sets with the CO-TUCKER model is the gain in interpretability.     

A two-stage procedure with accelerated test for selecting the best exponential population

In this article, we discuss a two-stage procedure for selecting the largest location parameter among k(k≥2) two-parameter exponential populations(or products) from an accelerated test. The accelerated test will be conducted at a higher stress level than that of normal in the second stage. under certain assumptions between parameter and stress leveL, the two-stage selection procedure, which guarantees that the probability of correct selection is at least p^*, is proposed. At the end of the paper , we present some useful tables that serve as a guide for the needed sample size in the second stage.     

依法治市 振兴海口经济——纪念十一届三中全会胜利召开20周年

党的十一届三中全会作出的加强社会主义法制，依法治国的决策，是政治、经济体制改革的需要，对依法治市有着极其重大的意义；要依法治市，振兴海口经济，就要加强地方立法；严肃行政执法；保证公正司法裁决；普及法律教育     

刘少奇“天津讲话”思想与七届二中全会精神比较研究

以宣传和贯彻党的七届二中全会精神为中心的“天津讲话”,蕴涵着刘少奇思想的精华。把我们党的理论探索成果与新生城市人民政权的实际情况紧密结合起来 ,正是“天津讲话”思想的实质所在。本文以对比“天津讲话”思想与七届二中全会精神为切入点 ,重在剖析两者之间的辨证关系。     

论高校政治文明

高校政治文明建设,是社会主义政治文明建设的重要组成部分。必须坚持贯彻"三个代表"重要思想,坚持好教代会制度,自觉推行校务公开,强化民主管理、民主监督,保障教职工当家作主的权利。     

巴黎和会对“以俄为师”思想确立的社会心理影响

巴黎和会中国外交失败之前,威尔逊在中国拥有美好形象和崇高威望,被中国民众视为“现在世界上第一个好人”和“今日世界最伟大之政治家”,但其在巴黎和会后期对中国的背弃将中国民众推入到失望的深渊。巴黎和会中国外交失败之后,列宁取代威尔逊成了新的政治明星,具有初步共产主义思想的知识分子和孙中山领导的国民党都确立了“以俄为师”的思想。威尔逊与列宁之间的形象易位严重影响了当时的社会心理认同,为中国共产党成立作了心理上的准备。     

遵义会议与毛泽东在中央领导地位的确立

长期以来,国内学术界一直把遵义会议作为“在事实上确立了毛泽东为核心的党中央的正确领导”或“确立了毛泽东在中共中央和红军的领导地位”的重要标志。事实上,确立毛泽东在党和红军的领导地位是有一个过程的,是由于特殊的战争环境和毛泽东所处的特殊地位以及拥有的政治资源,在中国共产党的核心层愈来愈具有了影响地位。1935年8月19日,组织上正式确认了毛泽东在党和红军中的领导核心地位。     

Wilks’ factorization of the matrix-variate Dirichlet–Riesz distributions

The Riesz distributions on positive definite symmetric matrices are used to introduce a class of Dirichlet–Riesz distributions. In addition, several distributional properties are stated. Essentially, we show the relationship between the Dirichlet–Riesz distributions of the first kind and the second kind, respectively. We derive Wilks’ factorization of the matrix-variate Dirichlet–Riesz. Further, several results on the product of Riesz and beta–Riesz matrices with a set of Dirichlet–Riesz matrices of the first kind have been derived.     

Nearly optimal covariate designs—Part I

We propose to discuss at length several examples from standard text books. All of these examples deal with analysis of covariance (ANCOVA) models and related analyses of data. We intend to capitalize on our understanding of optimal covariate designs (OCDs) in different ANCOVA models and re-visit these examples with a view to suggest optimal/nearly optimal designs for estimation of the covariate parameter(s). As we will see, for some examples our task is very much routine but for others, it is indeed a highly non trivial exercise.

?We intent to cover a total of six examples—divided in two parts. This is Part I—dealing with two examples.     

可对称化矩阵特征值的任意扰动

针对可对称化矩阵,研究了可对称化矩阵特征值的任意扰动和实任意扰动。从Schur分解入手,利用矩阵可对角化的性质,通过矩阵等式的恒等变形,得到了可对角化矩阵关于F-范数和Q-范数的任意扰动界。