符码实践中的权力逻辑:教育不平等的新视角

符码理论是伯恩斯坦的重要思想,为解释西方学生学业成败和教育不平等提供了一个崭新的分析框架。核心问题是:学校如何成为阶级再制的场域,符码、阶级和权力三者存在何种关系?以往研究认为学校教育是达成阶级平等流动的重要途径。然而,伯恩斯坦却发现:在资本主义制度下,由于符码背后蕴藏权力分配与社会控制原则,导致了教育不平等。学生来自不同阶层,言说符码有差异,造成学习起点明显差别。出身不利家庭的学生并未因学校教育而改善其学业成就不利现象,反而随着时间的增加,与中、上阶层学生之间的差距扩大。因为国家的课程都是精致型编码,饱含中产阶级语言特点,因此,中产阶级学生在学校教育中容易成功,而劳工阶级学生容易失败,现代市民社会的兴起也许是改变这一弊病的有效途径。     

Statistical estimation errors of VaR under ARCH returns

In this paper we discuss some problems of existing methods for calculating the Value-at-Risk (VaR) in ARCH setting. It should be noted that the commonly used approaches often confuse the true innovations with the empirical residuals, i.e., estimation errors for unknown ARCH parameters are ignored. We adjust this by using the asymptotics of the residual empirical process, and propose a feasible VaR which, according to the spirit of VaR, keeps the assets away from a specified risk with high confidence level. Its meaningfulness in comparison with the usual VaR will be illustrated clearly by numerical studies.     

大学生思想行为问题的成因与对策——以山西农业大学为例

当代大学生思想政治状况的主流是积极、健康、向上的，但随着国际国内形势的深刻变化，我国改革开放的不断推进，社会经济成分、就业方式、利益关系和分配方式日益多样化，对大学生的思想行为的影响日益增强。了解并解决大学生思想行为问题是大学思想政治教育工作得以顺利开展的基础。以山西农业大学为例，从生活感情、组织纪律、人际交往等方面分析了当前大学生思想行为方面存在的问题，从社会、家庭、学校、个人四个方面探悉了大学生思想行为存在问题的原因，从举办文化活动、开展干部培训、提高辅导员素质等方面提出了解决大学生思想行为问题的对策。     

信息透明度对B2B交易场作用的博弈分析

传统理论认为,低的信息透明度不利于买卖双方之间达成交易,无法实现资源在市场中的最优化配置,而提高信息的透明度将有利于改变这一局面。本文通过博弈论方法分析低信息透明度和高信息透明度分别对传统交易场和B2B交易场的负面影响作用,认为,高信息透明度对于在线交易并非完全是一件有益之事。在此基础上,本文提出了降低高信息透明度负面影响作用的方法。     

连锁型“不A不B”格式的认知模式

“不A不B”格式有能自由成词、语素自由应用和非自由成词、语素不能独立应用的语形特点 ,有其特有的功能 ,有其双核线性离散式、单核聚焦式、双核聚焦式、单核凝结整合式的认知模式。     

Ethnic and class factors affecting mental health clinic service

Service delivery by a mental health clinic to clients from an older suburban catchment area containing both lower and middle class blacks and whites was studied. The epidemiologic method was employed, relating service delivery to the characteristics of the various population groups within the catchment. The findings indicate that low service rates for blacks were not related to ethnicity alone, but to the combination of black ethnicity and low social status; however, middle class blacks and middle class whites who entered treatment received similar service. Poor blacks had higher admission rates than poor whites with similar need indicators. In continued treatment, poor blacks received lowest service rates while minority status poor whites living in a predominantly black area received highest service rates. Social class mediated black service utilization. Severity of illness, interacting with social class and minority status mediated white service utilization. Outreach is suggested not only for poor blacks but also for poor whites, especially those living in areas in which they represent an ethnic minority.     

我国企业对企业促销管理的实证研究

调查研究发现,我国企业对企业促销管理实践还存在着许多问题。针对这些问题,企业应真正树立以市场为导向的营销观念,加强促销宣传,实施人员促销、广告和营业推广相结合的促销组合策略,加强促销人员队伍建设,加强和完善电子邮件促销。     

Spline-backfitted kernel smoothing of partially linear additive model

A spline-backfitted kernel smoothing method is proposed for partially linear additive model. Under assumptions of stationarity and geometric mixing, the proposed function and parameter estimators are oracally efficient and fast to compute. Such superior properties are achieved by applying to the data spline smoothing and kernel smoothing consecutively. Simulation experiments with both moderate and large number of variables confirm the asymptotic results. Application to the Boston housing data serves as a practical illustration of the method.     

André Dabrowski's work on limit theorems and weak dependence

André Robert Dabrowski, Professor of Mathematics and Dean of the Faculty of Sciences at the University of Ottawa, died October 7, 2006, after a short battle with cancer. The author of the present paper, a long‐term friend and collaborator of André Dabrowski, gives a survey of André's work on weak dependence and limit theorems in probability theory. The Canadian Journal of Statistics 37: 307–326; 2009 © 2009 Statistical Society of Canada