三角函数的正交完备性研究

三角函数集是正交完备的.函数集的正交类似于向量的正交,根据正交及完备性的定义,证明三角函数集的正交完备性.     

有关实数完备性的进一步研究

文章研究总结了实数完备性中的四个定理,并给出了它们之间的等价关系,再结合之前对其他基本定理的证明,可以得到实数完备性的定理是等价的,这对刻画实数完备性具有一定的借鉴意义。     

求轨迹方程必须满足完备性与纯粹性

<正>求轨迹方程是高中数学的重要内容,也是学生易犯错误的部分.对此,笔者认为首先应加强"曲线与方程"概念的教学,使学生深刻理解在平面直角坐标系下,根据曲线与方程之间建立一一对应的要求,曲线上所有点的坐标都必须满足方程(完备性),并且坐标满足方程的所有的点都在曲线上(纯粹性),即轨迹方程必须满足完备性与纯粹性的要     

影响生物实验设计严密性的因素及方法改进

从实验的检测方法、实验材料、无关变量、自变量、操作步骤等方面,论述了影响高中生物实验设计严密性的因素,以及实验方法的改进。     

完备伪Zernike矩相似不变量集的构造

为了解决传统方法构造的矩不变量特征集存在的完备性和独立性问题,提出了一种完备的伪Zemike矩相似变换(旋转、平移和缩放)不变量集的构造方法,并给出了系统的推导和证明.首先推导了几何变换前后图像的伪Zemike矩之间的关系,然后基于该关系得到了伪Zernike矩的相似不变量集,并将其表示成变换前图像的同阶和低阶伪Zer...     

职业教育中开展“设计性实验”的探索与实践

作者根据在环境监测与评价专业教育中开展设计性实验的体会和心得,论述了在职业教育中成功开展设计性实验的必要条件:先进的教学理念、完备的实验基础、过硬的师资队伍、可行的实施方案和科学的考核方法,并详述了构建方案。     

多元一次线性回归的正交设计

利用二水平正交表进行正交设计，以消除回归系数之间的相关性，从而简化了回归系数的显系数的显性检验，使设计具有了旋转性，并可以根据预测值直接寻找最优区域。     

学会读取信息

学习变量之间的关系的有关知识时,当注意体验一个变量的变化对另一个变量的影响,体会自变量与因变量在数值上的对应关系,具体学习要点分类举例说明如下：     

职业教育中开展“设计性实验”的探索与实践

作者根据在“环境监测与评价”专业教育中开展“设计性实验”的体会和心得,论述了在职业教育中成功开展“设计性实验”的必要条件：先进的教学理念、完备的实验基础、过硬的师资队伍、可行的实施方案和科学的考核方法,并详述了构建方案。     

对照实验中几个常用概念的辨析

<正> 1 变量、自变量、因变量、无关变量变量是指与实验有关且可测评的可变因素或条件。自变量又称刺激变量、输入变量或实验处理。在实验假说和实验设计中,自变量是一种被假定为原因的变量;而在实验过程中,自变量是由实验研究者或教师主动操纵的因素,而且通过它的变化来引起其他变量发生变化。它既可以是事物     

A comparison of methods for determining dimensionality in Rasch measurement

This study compares the Rasch item fit approach for detecting multidimensionality in response data with principal component analysis without rotation using simulated data. The data in this study were simulated to represent varying degrees of multidimensionality and varying proportions of items representing each dimension. Because the requirement of unidimensionality is necessary to preserve the desirable measurement properties of Rasch models, useful ways of testing this requirement must be developed. The results of the analyses indicate that both the principal component approach and the Rasch item fit approach work in a variety of multidimensional data structures. However, each technique is unable to detect multidimensionality in certain combinations of the level of correlation between the two variables and the proportion of items loading on the two factors. In cases where the intention is to create a unidimensional structure, one would expect few items to load on the second factor and the correlation between the factors to be high. The Rasch item fit approach detects dimensionality more accurately in these situations.     

The influence of academic self-efficacy on academic performance: A systematic review

This review integrates 12 years of research on the relationship between academic self-efficacy and university student's academic performance, and known cognitive and motivational variables that explain this relationship. Previous reviews report moderate correlations between these variables, but few discuss mediating and moderating factors that impact this relationship. Systematic searches were conducted in April 2015 of psychological, educational, and relevant online databases for studies investigating academic self-efficacy and performance in university populations published between September 2003 and April 2015. Fifty-nine papers were eligible. Academic self-efficacy moderately correlated with academic performance. Several mediating and moderating factors were identified, including effort regulation, deep processing strategies and goal orientations. Given the paucity of longitudinal studies identified in this review, further research into how these variables relate over time is necessary in order to establish causality and uncover the complex interaction between academic self-efficacy, performance, and motivational and cognitive variables that impact it.     

我国金融发展与经济增长关系的实证分析——基于非线性Granger因果检验

现有我国金融发展与经济增长关系的研究大多基于线性框架,而相关实证研究发现,传统Granger因果检验方法可能因忽略变量间的非线性关系而导致结论出现显著偏差。采用新发展的非线性Granger因果检验方法-非参数T。检验方法,对我国金融发展与经济增长关系进行实证分析,结果表明,我国经济增长是金融发展的线性Granger原因,同时存在从金融发展到经济增长的非线性Granger因果关系,即两者互为因果关系。     

股票收益和交易量因果关系检验

通过对中国深圳A股市场上的股票交易量和股票收益及收益变动性之间的因果关系实证分析，发现交易量和价格绝对量的变化之间以及交易量和股票收益之间均至正相关，而收益变动性和交易量之间呈负相关。另外，不论是股票的交易量、股票收益以及股票收益的变动性都呈现序列平稳性，而股票价格则至现出非平稳性。股票交易量和股票收益之间存在双向因果关系，收益的变动性和交易量之间不存在Granger因果关系。     

随机弱大数定律和弱大教定律的充要条件

讨论了任意随机变量序列的弱大数定律,得到了随机变量序列分别服从随机弱大数定律和弱大数定律的充要条件,以及独立随机变量序列服从弱大数定律的相关结果。     

随机变量相依关系的度量

首先研究了相关系数在度量随机变量相依关系上的优点和缺陷,介绍了度量随机变量相依关系的理想统计量应具备的条件,针对联合分布可拆成一元边际分布和Copula的积,因此连接联合分布与边际分布的Copula函数应包含随机变量相依关系的一切信息,在此基础上给出了基于Copula函数表示的Spearman’s相关系数和Kendall’s相关系数以及它们的性质．     

宁波港口物流与第二产业协同发展研究

整理出1986-2013年宁波港口货物吞吐量和集装箱吞吐量数据以及宁波市历年的第二产业产值数据,并对数据进行了合理化处理.协整检验表明三个变量存在协整关系.随后构建平稳的无约束VAR模型,进行脉冲响应分析、方差分解和格兰杰因果检验.实证研究结果表明：宁波港口货物吞吐量与第二产业高度相关,集装箱吞吐量与第二产业的相关关系较小;宁波大宗商品物流进出口对宁波第二产业贡献度较大;应正确看待宁波集装箱吞吐量与第二产业发展的关系;应深化“三位一体”港航物流服务体系建设,构建高效的第二产业供应链.     

Socio-economic Segregation with (without) Competitive Education Policies. A Comparative Analysis of Argentina and Chile

Within the differentiated forms of education provision, this paper intends to inquire into the causality governing the relation between the use of vouchers in education and an increased enrolment segmentation or student sorting. It does so through a comparative analysis of the quasi-market reform in Chile and the quasi-monopoly system in place in Argentina. Although from a national perspective these two countries have faced very different decentralisation reforms, they have presently arrived at similar states of their education system in terms of their enrolments' socio-economic segregation. The paper shows that vouchers are not an independent variable but an intervening one within the determinants of socio-economic segmentation. The evidence from Chile and Argentina shows that enrolment segmentation is not a consequence of the introduction of vouchers, and the causal relationship between these two variables is not a clear one. That is, the family school choice decisions brought about by the introduction of systems such as vouchers appear endogenous to a series of factors that determine such choice; factors that that are evidently important in the determination of socio-economic enrolment segmentations in non-voucher systems. This article questions the validity of the highly predominant empirical analyses which take student socio-economic characteristics and school choice decisions as independent determinant variables of student results, and intends initiating further thinking of what really lies behind the inequities in education in developing countries.     

鸡还是蛋：中国金融发展与经济增长之关系（1992-2004年）

在向量自回归模型框架下,运用格兰杰(非)因果关系分析法、弱外生变量分析法检验中国金融发展与经济增长之间的短期和长期因果关系,结果表明,尽管中国金融改革是滞后于实体经济部门的改革,但在1992-2004期间,金融发展的确已促进了经济增长.在长期,尽管银行部门和股票市场都对经济增长有统计意义上的影响,但股票市场对GDP的影响力明显强于银行部门对GDP的影响力.     

对外开放、经济增长对本土创新能力影响的分析——以广西为例

通过建立VAR模型来考察广西1995-2012年期间对外开放水平、经济增长对本土创新能力的动态影响,通过协整分析、Granger因果检验及脉冲响应函数分析发现：三者之间均存在长期稳定的均衡关系,对外开放水平和本土创新能力尚未形成互为Granger原因;经济增长是本土创新能力的Granger原因,而本土创新能力并不是经济增长Granger原因;本土创新能力自身形成了良好的“累积效应”;对外开放水平对本土创新能力起到了短期促进、长期抑制的作用;经济增长为本土创新能力营造了良好的创新环境,但冲击能力较弱。