An Empirical Likelihood Ratio Test for Normality

The empirical likelihood ratio (ELR) test for the problem of testing for normality is derived in this article. The sampling properties of the ELR test and four other commonly used tests are provided and analyzed using the Monte Carlo simulation technique. The power comparisons against a wide range of alternative distributions show that the ELR test is the most powerful of these tests in certain situations.     

Small sample study on estimators of life distributions and of mean survival times using randomly censored data

Whereas large-sample properties of the estimators of survival distributions using censored data have been studied by many authors, exact results for small samples have been difficult to obtain. In this paper we obtain the exact expression for the ath moment (a > 0) of the Bayes estimator of survival distribution using the censored data under proportional hazard model. Using the exact expression we compute the exact mean, variance and MSE of the Bayes estimator. Also two estimators ofthe mean survival time based on the Kaplan-Meier estimator and the Bayes estimator are compared for small samples under proportional hazards.     

A boundary kernel for local polynomial regression

We define and compute a boundary kernel for local polynomial regression, We prove that the new kernel provides improvement over the existing kernels, Simulations show the improvement in finite samples.     

Multiple deletion measures and conditional influence in regression model

The joint effect of the deletion of the ith and jih cases is given by Gray and Ling (1984), they discussed the influence measures for influential subsets in linear regression analysis. The present paper is concerned with multiple sets of deletion measures in the linear regression model. In particular we are interested in the effects of the jointly and conditional influence analysis for the detection of two influential subsets.     

声像在外语教学中的应用

随着科技进步 ,传统的教学方法正面临新的挑战 ,在外语教学中使用直观生动的可视教学法已经越来越具现实意义。但如何在教学中使用声像教学 ,怎样组织开发声像资料 ,有何现实意义 ,怎样才能使声像更有助于外语及第二语言的学习 ,是一个值得研究的问题     

软腐欧文氏菌对大白菜根毛吸附的专化性

分3个层次测定了软腐欧文氏菌(Erwinia carotovora susp carotovora)对大白菜根毛吸附的专化性.病菌吸附表现出对寄主根毛表面的选择性、病原细菌与寄主问的专化性、吸附菌量在病菌不同菌株和奇主不同品种间的差异.讨论了病菌吸附专化性在寄主-病原物识别中的意义.     

高纯度Cr26Mo钢焊缝的力学和耐碱蚀性能

本文用钨极氩弧焊附加氩气延续保护的焊接方法对高纯度 Cr26Mo 钢进行可焊性研究。检验焊缝质量和力学性能,用失重法和电化学方法测试焊缝在阿蒙古天然碱苛化烧碱的高温浓碱液条件下的腐蚀行为,确定了腐蚀速度,评定了耐蚀性等级。观察焊缝金相组织,分析焊缝区碱蚀表面的腐蚀形态,判别力学性能试样的断口形貌特征和断裂类型,并鉴定了腐蚀过程中所形成的保护膜和沉淀物的形貌和晶体结构。表明该钢焊缝有较好的力学性能和耐内蒙天然碱苛化烧碱液的性能。     

基于T-S模糊模型的非线性组合预测方法研究

一、引言自从Ｊ．Ｍ．Ｂａｔｅｓ和Ｃ．Ｗ．Ｊ．Ｇｒａｎｇｅｒ首次提出组合预测方法［１］以来,组合预测的研究已经取得很大的进展,文献［２～６］对此有比较详细的综述和评价。根据集结或组合各单项预测模型的方式不同,组合预测一般可分为线性组合预测和非线性组合预...     

参与观察、类型比较和文化变迁的经验基础--评费孝通与利奇之间的理论分歧

本文对费孝通和利奇的理论作了较为详细的对比分析 ,并找出了他们的分歧所在 ,有助于社会人类学学者对我国社会问题的进一步研究     

论民族经济学的学科地位与作用

民族经济学于1979年创建,适应了中国多民族国家的国情与社会主义现代化建设需要,具有民族学与经济学的双重学科归属.这门由中国人自己创建的经济学分支学科,在学科理论建设、学术成果积累与专业人才培养方面取得了巨大成就.并通过不可取代的学科地位与鲜明的应用性特征,展现出民族经济学的发展前景.