我国部门间收入流量测算及特征分析

摘　　要:国民收入在部门间的分配流量及其比例,是宏观经济研究的重要内容。研究收入分配问题,不能不考虑部门间在收入分配中的相互关系,但我国目前官方只公布收入与部门交叉数据,还缺乏部门与部门交叉流量数据,且有3年的滞后期。本文采用了一种称为“双矩阵RAS法”的方法,首先利用官方公布的2003年收入与部门交叉数据对2005年收入与部门数据进行了测算,进而用“收入转移法”测算了2005年部门与部门交叉流量数据。分析了1997年至2005年我国部门间收入流量状况,总结出近年来我国部门间收入流量变化的六大特征,并提出了相应的建议。     

具有GARCH（1，1）-正态误差项的非对称单位根检验研究

摘　　要:理论研究表明许多经济变量呈现出非对称的门限自回归（TAR）或动态门限自回归（M-TAR）数据生成机制,因而非对称单位根检验就成为该领域的主要研究方向之一。本文对非对称单位根检验Enders-Granger方法在GARCH（1,1）-正态误差项下的检验水平与检验势作了系统的仿真研究。研究表明：GARCH（1,1）-正态误差项的TAR或M-TAR模型会对该方法的检验水平和检验势产生重要影响。     

基于工具-目标法的经济政策效应评价研究

经济政策评价不仅指政策决策评价，还应包括对政策执行效果进行评价，即效应评价。但目前在计量经济学的研究中，包括已出版的各类教科书中也都只给出了如何进行决策评价的方法，而没有对效应评价方法进行研究。这显然是欠缺的。采用经济计量分析法对经济决策评价，常用的方法有三种：工具-目标法（TOM）、最优控制法、政策模拟法。其中工具-目标法是最早用来进行政策决策评价的计量方法，它是由首届诺贝尔经济学奖得主之一丁伯根提出的。     

铅蓄电池正极材料的X射线衍射分析

本文用X射线衍射法对铅蓄电池正极活性材料二氧化铅进行了结构分析。结果表明:正极的二氧化铅同时存在二种不同的晶体结构。正方晶系的β—PbO_2主要分布在电极表面,针方晶系的α—PbO_2则分布在电极内部。如果将块状电极碾磨测量,α—PbO_2与β—PbO_2的含量几乎是相等的。     

流体流法分析图像/话音综合性能的解析解

图像/话音统计复用是用于宽带综合业务数字网的异步转移模式(ATM)的一个重要课题.讨论了用流体流法获得的统计复用排队方程的求解.采用二维变换法求出了特征矩阵所对应的特征根和特征向量的解析解,接着导出了排队的幸存函数和其它统计特征参数.文中的分析得到了数值计算法并被计算机模拟所证实.     

《高等代数》教程之我见

《高等代数》是一门普遍让学生感到头疼的课,这与所用教材的教程有一定关系,本文就目前所用的教材提出了一种较为适宜的教程,并论述了实施它的可能性与有利因素.     

Expressing Estimators of Expected Quality Adjusted Survival as Functions of Nelson-Aalen Estimators

Quality adjusted survival has been increasingly advocated in clinical trials to be assessed as a synthesis of survival and quality of life. We investigate nonparametric estimation of its expectation for a general multistate process with incomplete follow-up data. Upon establishing a representation of expected quality adjusted survival through marginal distributions of a set of defined events, we propose two estimators for expected quality adjusted survival. Expressed as functions of Nelson-Aalen estimators, the two estimators are strongly consistent and asymptotically normal. We derive their asymptotic variances and propose sample-based variance estimates, along with evaluation of asymptotic relative efficiency. Monte Carlo studies show that these estimation procedures perform well for practical sample sizes. We illustrate the methods using data from a national, multicenter AIDS clinical trial.     

Venezuelan Rainfall Data Analysed by Using a Bayesian Space–time Model

We consider a set of data from 80 stations in the Venezuelan state of Guárico consisting of accumulated monthly rainfall in a time span of 16 years. The problem of modelling rainfall accumulated over fixed periods of time and recorded at meteorological stations at different sites is studied by using a model based on the assumption that the data follow a truncated and transformed multivariate normal distribution. The spatial correlation is modelled by using an exponentially decreasing correlation function and an interpolating surface for the means. Missing data and dry periods are handled within a Markov chain Monte Carlo framework using latent variables. We estimate the amount of rainfall as well as the probability of a dry period by using the predictive density of the data. We considered a model based on a full second-degree polynomial over the spatial co-ordinates as well as the first two Fourier harmonics to describe the variability during the year. Predictive inferences on the data show very realistic results, capturing the typical rainfall variability in time and space for that region. Important extensions of the model are also discussed.     

A Nonparametric Test for the Parallelism of Two First-Order Autoregressive Processes

A nonparametric testing procedure for the parallelism of two first-order autoregressive processes is presented. This paper discuss the Mann–Whitney statistic, its natural competitor two-sample t -test, and the bootstrap method. It studies the asymptotic efficacies of the studentized Mann–Whitney statistic and the t -test statistic with their relative efficiency. Simulation results for comparing the powers of these test statistics are also presented.