Confidence interval estimation of the difference between paired AUCs based on combined biomarkers

In many diagnostic studies, multiple diagnostic tests are performed on each subject or multiple disease markers are available. Commonly, the information should be combined to improve the diagnostic accuracy. We consider the problem of comparing the discriminatory abilities between two groups of biomarkers. Specifically, this article focuses on confidence interval estimation of the difference between paired AUCs based on optimally combined markers under the assumption of multivariate normality. Simulation studies demonstrate that the proposed generalized variable approach provides confidence intervals with satisfying coverage probabilities at finite sample sizes. The proposed method can also easily provide P-values for hypothesis testing. Application to analysis of a subset of data from a study on coronary heart disease illustrates the utility of the method in practice.     

Modified inference about the mean of the exponential distribution using moving extreme ranked set sampling

The maximum likelihood estimator (MLE) and the likelihood ratio test (LRT) will be considered for making inference about the scale parameter of the exponential distribution in case of moving extreme ranked set sampling (MERSS). The MLE and LRT can not be written in closed form. Therefore, a modification of the MLE using the technique suggested by Maharota and Nanda (Biometrika 61:601–606, 1974) will be considered and this modified estimator will be used to modify the LRT to get a test in closed form for testing a simple hypothesis against one sided alternatives. The same idea will be used to modify the most powerful test (MPT) for testing a simple hypothesis versus a simple hypothesis to get a test in closed form for testing a simple hypothesis against one sided alternatives. Then it appears that the modified estimator is a good competitor of the MLE and the modified tests are good competitors of the LRT using MERSS and simple random sampling (SRS).     

中国制造业集聚：度量与显著性检验 ——基于集聚测量新方法

 根据集聚分布的自身特点,本文提出了可以进行显著性检验的普适性产业集聚指数,并对我国28制造业1994年的860个样本和2004年800个样本进行测量和检验,我们的计算结果表明,中国制造业的集聚强度总体上呈上升趋势,同时具有集聚和扩散双重现象。     

缺失数据时两个对数正态分布的估计和检验

讨论了部分缺失数据两对敷正态分布的参数估计和关于总体相同的似然比检验.证明了估计的强相合性和渐近正态性,给出了似然比检验统计量的极限分布,并讨论基于精确分布的检验问题.     

少数民族传统文化与自然环境的互动与适应——以金沙江河谷傣族为例

人类同所有动物一样,都面临着适应自然环境的问题,这个环境包括自然环境和人文环境。金沙江河谷傣族在长期迁徙和民族融合的过程中,不断地寻找、选择最佳生存环境,创造了自己独特的文化生长机制。这种文化生长机制建立起人与自然的和谐关系,达到人与自然的完美结合。     

自然环境与人类审美心理的发生

原始人类的审美心理潜伏于高等动物人猿的种族遗传,发端于人类时空观念的形成和对自然美的感受认识,表现于第一件艺术作品（石器）的创制,发展于自然崇拜、图腾崇拜、宗教巫术、神话传说、文学艺术。自然环境与人类审美心理的发生具有极为密切的关系。原始人类时空观念的形成和对自然形式美的感受体验是人类审美心理发生的契机。     

吉林省经济与资源、环境和谐发展的政策变革

中共十七大提出了以科学发展观为指导,实现经济发展又好又快的新时期目标,“社会更加和谐”是其中一个重要内容。结合经济社会的大背景和趋势以及吉林省的现状和问题,探讨致力于吉林省经济与资源、环境和谐发展的政策变革。     

海南中部地区黎族、苗族旅游民俗环境建设研究

海南省旅游业的发展,不仅要开发自然资源,还应大力开发黎族、苗族民俗资源,从而以旅游业的发展来带动海南中部黎族、苗族地区的经济发展。     

黎族习惯法在森林环境保护中的作用

本文论述黎族习惯法在森林环境保护中的作用。     

谈高校英语专业口译测试的规范化设计

口译测试是检测考生口译能力并获取教学反馈信息的重要手段。本文分析了当前高校口译测试中存在的问题,并以交际测试理论为指导,对口译测试的原则、内容、题型和评分标准等问题进行了综合研究和探讨,在此基础上对高校口译测试的规范设计和合理实施提出了具体建议和方案。