ROBUST COMPARISON OF DISPERSIONS FOR SAMPLES OF DIRECTIONAL DATA

Robust methods are proposed for testing whether several directional distributions on the unit p-sphere have comparable dispersions. The families of distributions considered are the Langevin for random vectors, and the Generalised Scheidegger-Watson for random axes, with specific interest in the Fisher and Watson distributions on the sphere. The methods are analogues of Levene's procedure for comparing variances of normal distributions.     

FITTING FINITE MIXTURE MODELS IN A REGRESSION CONTEXT

Suppose data are collected in a three-mode fashion (individuals x items X attributes), and it is sought to cluster the individuals into groups on the basis of lineat relations between scores on the attributes for each item and auxiliary measurements made on the same items. A mixture model is pro posed and the EM algorithm is used to fit it to the data by simultaneously estimating the group parameters and allocating individuals to groups. The method is illustrated by a simulation study and a real example in which consumers are clustered on the basis of product scores that are related to a sensory laboratory measurement.     

多种车流网络到单种车流网络的等价变换

本文讨论了多种车流网络到单种车流网络的等价变换方法。在实际的运输问题中,常会遇到多种车流的问题,采用了本方法之后,可使问题的解决变得较为简便,从而也提高了计算的效率。文中首先讨论了两种车流的情况,然后也述及一般情况,最后给出了两种车流的实际算例。     

A note on the universal optimality criterion for full rank models

The aim of this note is to suggest a revised formulation of the universal optimality criterion for full rank models as stated in Kiefer (1975). We have presented the relevant results with indications of some possible applications.     

Some computational problems related to multinomial trials

Efficient numerical algorithms are developed to evaluate several probabilities related to multinomial trials.In the first part of the paper, the probability distribution of the number of trials until the alternatives j, j = 1,… m, have occurred at least i_j times is computed. The multinomial trials involve the m alternatives l,…, m, with positive probabilities P_l-P_m of occurrence. In the second part, several aspects of a multinomial subset selection problem, discussed by S. S. Gupta and K. Nagel, are investigated.     

和平与发展:从“两大问题“到“时代主题“——论邓小平理论和“三个代表“重要思想产生的时代背景

马克思主义理论创新都与时代条件密切相关,邓小平理论和"三个代表"重要思想都是时代的产物.邓小平理论产生于"冷战时代","和平与发展"是那一时代的"两大问题"."三个代表"重要思想形成于"和平与发展为主题的时代",政治格局多极化、经济全球化和科技发展日新月异是其三个显著特点.     

视频点击流数据挖掘在远程教育中的应用

Web数据挖掘已经成为数据挖掘技术一个重要的应用领域,文章主要通过对远程教育网站的视频点击流日志文件进行数据挖掘,寻求用户访问规律,构建动态的个性化教育网站.     

大学生心理健康教育与高校图书馆

当前大学生心理健康教育已刻不容缓,本文通过分析大学生心理问题产生的根源及高校采取的一般对策,指出高校图书馆应利用其特有的人文优势成为大学生心理健康教育基地之一,并给出了具体的建议。     

重庆市高校独立学院办学现状、问题及对策研究

通过对重庆市5所有代表性的高校独立学院的调研发现,学生对重庆市的独立学院办学满意度不高,认为独立学院在办学体制、办学条件、学校管理等方面存在很多的问题,各独立学院应构建高效协调的管理机制,强化社会评价体系,改善办学条件,提升人才质量,才能促进独立学院的发展。