Directional mixture models and optimal estimation of the mixing density

The authors develop consistent nonparametric estimation techniques for the directional mixing density. Classical spherical harmonics are used to adapt Euclidean techniques to this directional environment. Minimax rates of convergence are obtained for rotation ally invariant densities verifying various smoothness conditions. It is found that the differences in smoothness between the Laplace, the Gaussian and the von Mises‐Fisher distributions lead to contrasting inferential conclusions.     

The number of records within a random interval of the current record value

LetX ₁,X ₂, … be a sequence of i.i.d. random variables with some continuous distribution functionF. LetX(n) be then-th record value associated with this sequence and μ _n ⁻ , μ _n ⁺ be the variables that count the number of record values belonging to the random intervals(f−(X(n)), X(n)), (X(n), f+(X(n))), wheref−, f+ are two continuous functions satisfyingf−(x)<x, f+(x)>x. Properties of μ _n ⁻ , μ _n ⁺ are studied in the present paper. Some statistical applications connected with these variables are also provided.     

Multiple-arm superiority and non-inferiority designs with various endpoints

Multiple-arm dose-response superiority trials are widely studied for continuous and binary endpoints, while non-inferiority designs have been studied recently in two-arm trials. In this paper, a unified asymptotic formulation of a sample size calculation for k-arm (k>0) trials with different endpoints (continuous, binary and survival endpoints) is derived for both superiority and non-inferiority designs. The proposed method covers the sample size calculation for single-arm and k-arm (k> or =2) designs with survival endpoints, which has not been covered in the statistic literature. A simple, closed form for power and sample size calculations is derived from a contrast test. Application examples are provided. The effect of the contrasts on the power is discussed, and a SAS program for sample size calculation is provided and ready to use.     

中学英语教学培养学生语感研究

语感意即学习者多方位接触某种语言及其相关文化而产生的一种规律性的感觉.语感能力作为重要能力结构因素贯穿于中学阶段,其影响作用日益增强.中学英语教学要从听说、读、写等三个环节,持之以恒地将语感训练和语感能力的培养贯穿于英语教学的每个环节,采用多种方法和途径,引导学生在一切语言交际中有意识地去感受语感、把握语感、实践语感.     

学校认同与大学生隐性逃课的关系：有调节的中介效应分析

为了探讨学校认同对隐性逃课的影响以及学习动机的中介作用和感恩的调节作用,采用学校认同量表、学习动机问卷、隐性逃课量表和感恩问卷对1098名大学生进行施测。结果发现：1）学校认同对隐性逃课具有显著的负向预测作用;2）学习动机在学校认同与隐性逃课的关系中起部分中介作用;3）学校认同对隐性逃课的直接预测作用及学习动机在二者关系中的中介作用均受到感恩的调节。因此,学校认同通过学习动机影响大学生隐性逃课,感恩调节了学校认同与隐性逃课、学校认同与学习动机之间的关系。关键词：学校认同;隐性     

中小学校长专业发展的涵义及策略思考——基于江苏省中小学校长的调查研究报告

中小学校长专业发展是一个在学校内外因素影响下 ,校长主体主动专业化的过程 ,在这一过程中表现为 6个方面的特征 ,有 4个持续专业发展的策略     

电视娱乐节目主持人个性风格分析

电视娱乐节目主持人的个性风格包含两个方面——语言个性和体态个性,这二者相互融合,形成别具一格的主持人个性风格。主持人的个性风格在当代综艺娱乐电视节目中起着举足轻重的地位,决定着综艺娱乐电视节目的发展方向。     

论西方传统文化视阈中的和谐

西方传统文化蕴含着丰富的和谐思想,从公元前6世纪末5世纪初的古希腊毕达哥拉斯学派,到近代的德国哲学家黑格尔,众多的西方哲学流派及思想家从不同角度对和谐思想的内涵进行了深入的阐释。西方传统文化中的和谐思想,是建设社会主义和谐文化的重要思想借鉴。     

浅谈学校管理中的物质激励和精神激励

学校管理中经常需要使用物质激励和精神激励两种手段来提高教职工的积极性,但在市场经济条件下,如何正确认识物质激励和精神激励的特点和使用方式对于促进学校的管理和改革是十分重要的。