时变空间权重矩阵面板数据模型稳健LM检验有效性研究

空间权重矩阵是描述个体间空间关系的重要工具,通常基于个体间的地理距离构造不随时间而改变的空间权重矩阵。然而,当个体间的空间关系源自经济/社会/贸易距离或人口流动性/气候等特征时,空间权重矩阵本质上可能将随时间而改变。由此,本研究提出时变空间权重矩阵面板数据模型的稳健LM检验。大量Monte Carlo模拟结果显示：从检验水平和功效角度来看,基于误设的非时变空间权重矩阵的稳健LM检验存在较大偏差,但是基于时变空间权重矩阵的稳健LM检验能够有效地识别面板数据中的空间关系类型。尤其是,在时间较长和个体较多等情况下,时变空间权重矩阵的稳健LM检验功效更高。     

On linear regression designs which maximize information

Necessary and sufficient conditions are established when a continuous design contains maximal information for a prescribed s-dimensional parameter in a classical linear model. The development is based on a thorough study of a particular dual problem and its interplay with the optimal design problem, extending partial results and earlier approaches based on differential calculus, game theory, and other programming methods. The results apply in particular to a class of information functionals which covers c-, D-, A-, L-optimality, they include a complete account of the non-differentiable criterion of E-optimality, and provide a constructive treatment of those situations in which the information matrix is singular. Corollaries pertain to the case of s out of k parameters, simultaneous optimality with respect to several criteria, multiplicity of optimal designs, bounds on their weights, and optimality which is induced by admissibility.     

On the independence of linear and quadratic forms in normal variates

The independence of linear and quadratic forms in normal variates is very important in linear models and multivariate analysis, especially for the independence of quadratic forms. However, associated proofs in the early literature are incorrect, incomplete, or misleading. In this article, we provide simple and elegant proofs for some extended results.     

Batch process control using QFD matrices and simulation

An intuitive method for providing decision support of production control activities is proposed in which qualitative management information is represented by way of Quality Function Deployment matrices, while quantitative information is collected in the form of a simulation model of the plant. The quantitative-to-qualitative transform is provided by way ofgoal programming and fuzzy decision rules-where the latter naturally complements the symbolic method of representing information.     

中国金融资金流量矩阵表延长模型研究

金融资金流量矩阵表具有重要应用价值,然而我国资金流量表只采用账户表式,而且数据滞后严重,使其应用价值难以实现。本文在对资金流量矩阵表表式结构、账户分类和平衡关系进行深入理解的基础上,将计量经济模型中的多元回归模型、时间序列模型、状态空间模型及RAS模型有效地组合在一起,设计了一套延长金融资金流量矩阵表的组合模型,然后应用该模型将我国金融资金流量矩阵表从2009年延长至2012年。经后验法检验,数据质量达到了一个较为理想的状态。这套模型可以作为官方统计机构或民间研究机构延长资金流量表数据的通用方法使用。     

A statistical method for the serial comparison of vector cardiograms

In the absence of quantitative clinical standards to detect serial changes in cardiograms, statistical procedures are proposed as an alternative. These procedures are preceded by a dimension reducing orthonormal transformation of the original digitized cardiogram into a lower dimensional feature space. In feature space, mul-tivariate test criteria are given for the detection of changes in covariance matrices or mean vectors of the cardiograms. The flexibility is provided to compare the cardiograms of the same individual pairwise or simultaneously. Some pertinent remarks are also made about controlling the overall level of significance and its impact on the application of these techniques to cardiograms of USAF pilots.     

类中心在选书中的应用

本文用Fuzzy数学的方法,给出了一个专业所有课程的类中心和中心课程的概念;并成功地利用该理论,解决了高校图书馆选书的难题。     

Brownian矩阵环中的群逆与Drazin逆

本文指出了M．J．C．Gover关于Brownian矩阵环的群逆的一个错误，得到了矩阵A∈的群逆A#∈的充要条件．证明了，当A∈时，其Drazin逆A（d）∈，并给出了确定A（d）的一个算法．     

基于矩阵式资金流量表的涉外交易考察

 资金流量核算是国民经济核算体系的重要组成部分,但中国已公布的账户式资金流量表不能反映机构部门间收入流量交易与金融投资交易状况,通过编制国民收入流量矩阵与金融资金流量矩阵,能够对机构部门间的收入分配交易与金融投资交易情况进行深入考察。本文通过编制1992年至2008年涉外交易国民收入流量矩阵和金融资金流量矩阵考察了国外部门参与国民收入分配、金融资金流动过程的情况,得出了一些账户式资金流量表难以呈现的结论。