Improved deviance goodness of fit statistics for a gamma regression model

A gamma regression model with an exponential link function for the means Is considered. Moment properties of the deviance statistics based on maximum likelihood and weighted least squares fits are used to define modified deviance statistics which provide alternative global goodness of fit tests. The null distribution properties of the deviances and modified deviances are compared with those of the approximating chi-square distribution and It is shown that the use of the modified deviances gives much better control over the significance levels of the tests.     

A powerful test for uniformity to detect highly peaked alternativedensities

A new class of statistical tests for uniformity based on sample ranges is proposed to detect a uniform density contaminated by a density with one or more high peaks. These kinds of alternatives occur quite frequently, especially in physics. It is shown that the proposed tests arc consistent and have high Pitman asymptotic relative efficiencies. Results of a Monte Carlo power study indicate that they, compared with other tests of uniformity, possess good power properties.A comparative study of various tests is also conducted using real data. An effcient algorithm for computing out test statistic and a table of percentage points are given, providing a practical guide for using the new test.     

On the robustness of the extreme deviate test for a single multivariate outlier against heavy-tailed distributions

In this paper we assess the sensitivity of the multivariate extreme deviate test for a single multivariate outlier to non-normality in the form of heavy tails. We find that the empirical significance levels can be markedly affected by even modest departures from multivariate normality. The effects are particularly severe when the sample size is large relative to the dimension. Finally, by way of example we demonstrate that certain graphical techniques may prove useful in identifying the source of rejection for the multivariate extreme deviate test.     

Semiparametric Bayesian classification with longitudinal markers

Summary.  We analyse data from a study involving 173 pregnant women. The data are observed values of the β human chorionic gonadotropin hormone measured during the first 80 days of gestational age, including from one up to six longitudinal responses for each woman. The main objective in this study is to predict normal versus abnormal pregnancy outcomes from data that are available at the early stages of pregnancy. We achieve the desired classification with a semiparametric hierarchical model. Specifically, we consider a Dirichlet process mixture prior for the distribution of the random effects in each group. The unknown random-effects distributions are allowed to vary across groups but are made dependent by using a design vector to select different features of a single underlying random probability measure. The resulting model is an extension of the dependent Dirichlet process model, with an additional probability model for group classification. The model is shown to perform better than an alternative model which is based on independent Dirichlet processes for the groups. Relevant posterior distributions are summarized by using Markov chain Monte Carlo methods.     

高新技术园区社会创新环境的系统整合

今天的高新技术园区在发展的意义上 ,已经成为现实的社会实体。从这一理念出发 ,思考园区的建设和发展 ,其创新环境是个非常重要的问题 ,也可以说它是各类高新技术园区得以发展的基本条件。创新环境状况的好坏直接关系到园区内高新技术产业的发展。从严格意义上讲 ,缺少这个基本条件 ,高新技术园区难以形成 ,创新环境不完善 ,即便是已经建立起来的园区 ,也难以得到真正的发展。由此决定了建设高新技术园区必须重视对园区社会创新环境的研究 ,通过精心培育创新环境 ,推动我国高新技术园区在 2 1世纪得到健康、持续的发展。     

敦煌文书所记南诏与吐蕃的关系

敦煌藏文《吐蕃史》文献中,有三处记载了公元8世纪时地处祖国大西南的南诏与吐蕃的关系熏可以和汉文史籍相印证。本文依据敦煌文献对这三处记载作了记述。     

革命文学群己对立英雄观辨析

朱德发从人类视野探讨了集体英雄与个体英雄相互依存的辩证关系,在精神意识深层开掘了集体英雄和个体英雄的灵魂构成,认为英雄既有个性主义意识又有集体主义思想,二者并非对立而是有机统一的。王寰鹏认为,梁晓声知青小说的英雄主义既带有浓重的历史印记又体现了人性的本能,歌颂英雄主义和反思历史是梁晓声知青小说中同时存在的价值追求。李宗刚认为,“十七年”文学英雄叙事是中国革命这一宏大历史的缩影,其中隐喻着中国革命在艰难曲折中最终走向更伟大的胜利;同时,英雄叙事还契合了主流意识形态的需求,满足了主流意识形态时“个人魅力型权力”的眷恋。李钧从英雄性格入手,比较了《犯人李铜钟的故事》与《天下荒年》这两篇小说的英雄观及其文化哲学的差异。张伟忠通过对《人间正道》和《抉择》中的改革英雄形象的艺术分析,认为他们身上既有对传统君子型英雄人格优秀品质的继承,也有对当代改革英雄品质的发扬光大。改革英雄的人格结构并不全是现代性的,其中还有权威人格和长官意志等传统人格负面因素的残留。杨新刚认为,20世纪90年代以来的英雄叙事小说具有如下特征:从“英雄的人”向“人的英雄”的转进;英雄类型的世俗化和当代性;游走在主旋律与消费主义之间的叙事策略;由反传奇性向生活化叙事抵达等。     

化工原理实验教学软件的开发

介绍了化工原理实验教学软件的基本框架、功能及其用途,软件采用Microsoft Visual Basic 6.0编写,界面友好,功能齐全、操作简单、并可根据实际需要进行功能扩充,为化工原理实验CAI教学与实际应用提供了方便。