On square ordinal contingency tables: a comparison of social class and income mobility for the same individuals

Summary.  Square contingency tables with matching ordinal rows and columns arise in particular as empirical transition matrices and the paper considers these in the context of social class and income mobility tables. Such tables relate the socio-economic position of parents to the socio-economic position of their child in adulthood. The level of association between parental and child socio-economic position is taken as a measure of mobility. Several approaches to analysis are described and illustrated by UK data in which interest focuses on comparisons of social class and income mobility tables that are derived from the same individuals. Account is taken of the use of the same individuals in the two tables. Additionally comparisons over time are considered.     

Nonparametric control charts based on runs and Wilcoxon-type rank-sum statistics

In this article, we introduce three new distribution-free Shewhart-type control charts that exploit run and Wilcoxon-type rank-sum statistics to detect possible shifts of a monitored process. Exact formulae for the alarm rate, the run length distribution, and the average run length (ARL) are all derived. A key advantage of these charts is that, due to their nonparametric nature, the false alarm rate (FAR) and in-control run length distribution is the same for all continuous process distributions. Tables are provided for the implementation of the charts for some typical FAR values. Furthermore, a numerical study carried out reveals that the new charts are quite flexible and efficient in detecting shifts to Lehmann-type out-of-control situations.     

Bayesian robustness of the compound Poisson distribution under bidimensional prior: an application to the collective risk model

The distribution of the aggregate claims in one year plays an important role in Actuarial Statistics for computing, for example, insurance premiums when both the number and size of the claims must be implemented into the model. When the number of claims follows a Poisson distribution the aggregated distribution is called the compound Poisson distribution. In this article we assume that the claim size follows an exponential distribution and later we make an extensive study of this model by assuming a bidimensional prior distribution for the parameters of the Poisson and exponential distribution with marginal gamma. This study carries us to obtain expressions for net premiums, marginal and posterior distributions in terms of some well-known special functions used in statistics. Later, a Bayesian robustness study of this model is made. Bayesian robustness on bidimensional models was deeply treated in the 1990s, producing numerous results, but few applications dealing with this problem can be found in the literature.     

A Construction of Lancaster Probabilities with Margins in the Multidimensional Meixner Class

The well-known Meixner class (Meixner, 1934) of probabilities on R has been extended recently to R ^d (Pommeret, 1996). This generalized Meixner class corresponds to the simple quadratic natural exponential families characterized by Casalis (1996). Following Lancaster (1975), the present paper offers a characterization of the joint probability of a randomvector ( X, Y ) such that the two variables X and Y on R ^d belong to the multidimensional Meixner class and fulfil a bi-orthogonality condition involving orthogonal polynomials. The joint probabilities, called Lancaster probabilities, are characterized by two sequences of orthogonal polynomials with respect to the margins and a sequence of expectations of products. Some multivariate probabilities are studied, namely the Poisson-Gaussian and the gamma-Gaussian.     

浅析当前国际环境和国际政治斗争给大学生带来的影响

本文概述了当前的国际环境和国际政治斗争的新变化 ,分析了国际环境和国际政治斗争给大学生带来的影响 ;对新形势下 ,高等学校如何抵制和防范西方敌对势力的渗透和颠覆进行了初步的探讨。     

新形势下坚持党的先进性的科学抉择

在新时期 ,我们应正确认识无产阶级政党的先进性与党员成份之间的科学关系 ;明确吸收新的社会阶层中的优秀分子入党是建设有中国特色社会主义伟大事业的必然要求 ;有利于进一步巩固党的工人阶级先锋队性质。     

纳萨尔主义农村武装斗争——印度政府国内安全的头号威胁

论及印度纳萨尔主义农村武装斗争的历史与现状,农村武装斗争长期存在的原因以及印度政府的对策。目前,这一运动已发展成为一支不可忽视的农村武装力量,其产生的影响已成为威协印度国内安全的头号问题。     

国际化:建设世界一流大学的必由之路

国际化是世界一流大学的基本特征 ,国际化在世界一流大学的创建过程中具有特别重要的作用。但我国大学在创建世界一流大学过程中普遍对国际化重视不够 ,这在客观上制约着我国世界一流大学的建设进程。要改变这种状况 ,一要准确理解大学国际化的概念 ,克服思想认识的种种误区 ;二要采取有力措施 ,迅速促进我国大学国际化的进程     

发挥学生主体作用,改善大班英语教学

从 2 0 0 0届本科生开始 ,石油大学英语课实行大班授课体系 ,这是该校教学改革的新课题。改善英语大班课堂教学的前提和关键就是发挥学生的主体作用。具体做法就是以交际为目的 ,以学生为中心、培养学生自学能力、注重个体参与、解决分组操练、建立融洽的师生关系 ,提出了改善英语大班课堂教学的新路子和新举措。同时从实际出发 ,列举了新的教学模式的良好效果。