归因和自我效能感在自我调节学习中的作用

文章以416名高中生为被试,用归因问卷、自我效能感问卷和自我调节学习问卷为工具,对归因和自我效能感在自我调节学习中的作用进行分析.结果表明:(1)归因和自我效能感直接对自我调节学习策略产生影响;(2)归因方式、自我效能感和自我调节学习策略存在性别差异;(3)归因方式存在年级差异;(4)动机成分中的自我效能感和归因是作为调节机制而存在的,影响到个体对认知和元认知策略的选择.     

我国《科学学与科学技术管理》和《科学学研究》1999-2003文章内部结构和资助状况浅析

应用统计学软件SPSS,对《科学学与科学技术管理》和《科学学研究》1999—2003年刊发的825篇研究性论文的发表年、文章内部结构及资助者进行文献统计分析,以深入透析我国科技管理研究所处的阶段、研究方向和研究内容,找出其研究的特点与不足。目前科学学研究性论文研究内容有三个倾向即“集中化倾向”、“理论化倾向”和“国家政策倾向”;研究阶段多处于“问题描述阶段”;研究方法以“非经验研究”为主;基金资助比例失调。     

英汉动物名词翻译的不等值

本文从中西方文化差异的角度,通过大量实例,分析了动物名词翻译中的不等值现象。旨在提醒英语界同仁,在掌握词汇的同时,应多了解中西方不同的文化背景,翻译出脍炙人口的作品。     

当前中国社会的四个利益群体

本文从经济利益关系的角度 ,将当今的中国社会各阶层区分为四个主要社会群体 ,即特殊获益者群体、普通获益者群体、利益相对受损群体和社会底层群体。任何改革都是利益关系的调整 ,都会造成物质利益的得失。本文证明大多数中国人在 2 0年的改革中还是获得了利益的。然而 ,利益获得的多寡是有差异的。本文分析了社会各群体的利益获得和利益相对受损。只有了解了此种情况 ,我们在将改革向前推进时 ,才会使其每一项措施能够尽可能地对于多数人有利 ,尽可能减少改革的负面效应     

我国指数基金运作与绩效研究

一、引言指数基金起源于美国 ,1971年美国威弗银行(ＷｅｌｌｓＦａｒｇｏＢａｎｋ)向机构投资者推出了世界上第一只指数基金。指数基金是投资基金的一种类型 ,它是以证券市场的股票指数为投资对象 ,导入指数投资概念 ,采用指数化投资 (也叫资产等级投资或消极投资 )方法 ,跟踪目标指数 ,使自己本身的投资收益率与市场指数收益率基本一致的一种证券投资基金。我国于 1999年 7月 14日正式推出了两只指数基金———基金兴和和基金普丰 ,在设计时均借鉴了国外的运作经验———投资运作跟踪大盘运行 ,同时又体现了自己的独到之处———不完全是纯…     

Coherent mortality forecasting by the weighted multilevel functional principal component approach

In human mortality modelling, if a population consists of several subpopulations it can be desirable to model their mortality rates simultaneously while taking into account the heterogeneity among them. The mortality forecasting methods tend to result in divergent forecasts for subpopulations when independence is assumed. However, under closely related social, economic and biological backgrounds, mortality patterns of these subpopulations are expected to be non-divergent in the future. In this article, we propose a new method for coherent modelling and forecasting of mortality rates for multiple subpopulations, in the sense of nondivergent life expectancy among subpopulations. The mortality rates of subpopulations are treated as multilevel functional data and a weighted multilevel functional principal component (wMFPCA) approach is proposed to model and forecast them. The proposed model is applied to sex-specific data for nine developed countries, and the results show that, in terms of overall forecasting accuracy, the model outperforms the independent model and the Product-Ratio model as well as the unweighted multilevel functional principal component approach.     

Hard thresholding regression

In this paper, we propose the hard thresholding regression (HTR) for estimating high‐dimensional sparse linear regression models. HTR uses a two‐stage convex algorithm to approximate the ?₀‐penalized regression: The first stage calculates a coarse initial estimator, and the second stage identifies the oracle estimator by borrowing information from the first one. Theoretically, the HTR estimator achieves the strong oracle property over a wide range of regularization parameters. Numerical examples and a real data example lend further support to our proposed methodology.     

Semiparametric sieve maximum likelihood estimation under cure model with partly interval censored and left truncated data for application to spontaneous abortion

Lifetime Data Analysis - This work was motivated by observational studies in pregnancy with spontaneous abortion (SAB) as outcome. Clearly some women experience the SAB event but the rest do not....