Functional sliced inverse regression analysis

Most of the usual multivariate methods have been extended to the context of functional data analysis. Our contribution concerns the study of sliced inverse regression (SIR) when the response variable is real but the regressor is a function. In the first part, we show how the relevant properties of SIR remain essentially the same in the functional context under suitable conditions. Unfortunately, the estimation procedure used in the multivariate case cannot be directly transposed to the functional one. Then, we propose a solution that overcomes this difficulty and we show the consistency of the estimates of the parameters of the model.     

高师院校英语优质专业建设的探索

优质专业是一种具有示范作用和辐射效应的榜样专业，可以带动各种教学工作的改革与发展。高师院校英语优质专业应有明确的专业定位，大力加强师资队伍、课程体系、办学资源、实践教学和管理制度等方面的建设，提高专业办学水平和人才培养质量。     

如东县计划生育优质服务“三询”评估制

对改进计划生育目标管理责任制考核办法的必要性及建立计划生育优质服务以面询、电询、函询为主的"三询"评估制的必要性进行了论述,并结合如东县"三询"评估制的实践情况,对其科学性、可行性和可操作性进行了阐述,旨在为调整计划生育责任制考核机制,推动计划生育优质服务提供新的思路.     

加快科技奥运建设,促进首都实现跨越式发展

科技奥运是中国申奥成功的重要理念 ,也将成为北京举办奥运会的重要保障条件。加快科技奥运建设对于实现奥运承诺 ,促进首都乃至全国经济、科技的发展都具有深远的意义。“以科技助奥运 ,以奥运促科技”是科技奥运建设的重要内容。本文从科技奥运提出的背景、含义、建设目标、主要任务、实施一年多来取得的进展等方面进行了比较全面的描述。     

On asymptotic distribution of the test statistic for the mean of the non-isotropic principal component

In this paper, the authors derived the large sample distribution of the t statistic based upon the observations on the first principal component instead of the original variables. It is shown that the above statistic is distributed asymptotically as Student's t distribution.     

高中生的体型认同:基于女性的分析视角

从身体社会学来看,女性的体型审美取向是男权文化的典型表征。通过中日韩三国高中生的对比分析发现,与男生相比,高中女生普遍接受"以瘦为美"的体型观,存在更为严重的体型认同问题:在主观体型认知上,倾向于"向胖认同";在体型认同情绪上,表现为对"胖"不满:在体型认同策略上,以饮食减肥为主。这表明,身体焦虑已蔓延到了高中生群体,导致高中女生中存在着较为明显的体型认同偏差和盲目减肥现象。究其原因,传媒的渲染与强化起的是主导作用,家庭教养和同辈交往也有间接影响。     

Extreme Quantile Estimation for Autoregressive Models

ABSTRACT

A quantile autoregresive model is a useful extension of classical autoregresive models as it can capture the influences of conditioning variables on the location, scale, and shape of the response distribution. However, at the extreme tails, standard quantile autoregression estimator is often unstable due to data sparsity. In this article, assuming quantile autoregresive models, we develop a new estimator for extreme conditional quantiles of time series data based on extreme value theory. We build the connection between the second-order conditions for the autoregression coefficients and for the conditional quantile functions, and establish the asymptotic properties of the proposed estimator. The finite sample performance of the proposed method is illustrated through a simulation study and the analysis of U.S. retail gasoline price.     

On estimating the dimensionality in discriminant analysis

In discriminant analysis, the dimension of the hyperplane which population mean vectors span is called the dimensionality. The procedures commonly used to estimate this dimension involve testing a sequence of dimensionality hypotheses as well as model fitting approaches based on (consistent) Akaike's method, (modified) Mallows' method and Schwarz's method. The marginal log-likelihood (MLL) method is developed and the asymptotic distribution of the dimensionality estimated by this method for normal populations is derived. Furthermore a modified marginal log-likelihood (MMLL) method is also considered. The MLL method is not consistent for large samples and two modified criteria are proposed which attain asymptotic consistency. Some comments are made with regard to the robustness of this method to departures from normality. The operating characteristics of the various methods proposed are examined and compared.     

微小孔零件的钻削加工

指出了微小孔零件加工中存在的问题，从高速主轴、刀具、材料、加工工艺方面提出了实现微小孔加工的条件，通过几个微上孔加工的实例，说明对微小孔加工的可行性。     

制约当前高职教育质量提高的因素分析及对策

从招生规模扩大、办学经费不足、师资队伍建设滞后、实践教学薄弱、缺乏创新性质量监控与评价体系和人才培养与社会需求不相适应6个方面，分析了制约当前高职教育教学质量提高的因素，并提出了具体的解决对策。