对"八大"历史功绩的再回顾

中共“八大”在探索中国社会主义建设道路方面的功绩主要有 :第一 ,提出了把党的工作重点转移到社会主义经济建设上来的理论 ;第二 ,初步提出了区别于传统模式的发挥中央与地方两个积极性的体制和以计划经济为主、以商品经济为辅的社会主义经济模式 ;第三 ,正确规定了既反保守又反冒进即在综合平衡中稳步前进的经济建设方针和若干经济政策。     

Effects of fiscal policy on the U.S. economy: Empirical estimates of crowding out

This study examines the short-and intermediate-run effects of a permanent reduction in U.S. personal income taxes on interest rates, output, prices, exchange rates, and the current account, holding government spending and money growth fixed. The theoretical analysis suggests that interest rates and domestic consumption will rise but that net exports and interest-sensitive expenditures will fall. Also, the foreign currency value of the dollar will rise except possibly when output increases due to positive supply-side effects or to elimination of unemployment. These theoretical conclusions are essentially confirmed by simulations using the Federal Reserve Board's MPS quarterly econometric model and its multicountry model.     

Some locally optimal subset selection rules for comparison with a control

Let π₀,π₁,…,π_k be k+1 independent populations. For i=0,1,…,k,π_i has the densit f(x,θ_i), where the (unknown) parameter θ_i belongs to an interval of the real line. Our goal is to select from π₁,… π_k (experimental treatments) those populations, if any, that are better (suitably defined) than π₀ which is the control population. A locally optimal rule is derived in the class of rules for which Pr(π_i is selected)γ_i, i=1,…,k, when θ₀=θ₁=?=θ_k. The criterion used for local optimality amounts to maximizing the efficiency in a certain sense of the rule in picking out the superior populations for specific configurations of θ=(θ₀,…,θ_k) in a neighborhood of an equiparameter configuration. The general result is then applied to the following special cases: (a) normal means comparison — common known variance, (b) normal means comparison — common unknown variance, (c) gamma scale parameters comparison — known (unequal) shape parameters, and (d) comparison of regression slopes. In all these cases, the rule is obtained based on samples of unequal sizes.     

Test for the equality of several correlation coefficients

We derive two C(α) statistics and the likelihood-ratio statistic for testing the equality of several correlation coefficients, from k ≥ 2 independent random samples from bivariate normal populations. The asymptotic relationship of the C(α) tests, the likelihood-ratio test, and a statistic based on the normality assumption of Fisher's Z-transform of the sample correlation coefficient is established. A comparative performance study, in terms of size and power, is then conducted by Monte Carlo simulations. The likelihood-ratio statistic is often too liberal, and the statistic based on Fisher's Z-transform is conservative. The performance of the two C(α) statistics is identical. They maintain significance level well and have almost the same power as the other statistics when empirically calculated critical values of the same size are used. The C(α) statistic based on a noniterative estimate of the common correlation coefficient (based on Fisher's Z-transform) is recommended.     

Selecting the better binomial population under a budget constraint

The problem of optimal non-sequential allocation of observations for the selection of the better binomial population is considered in the case of fixed sampling costs and budget. With the appropriate choice of selection rule it is shown that a 70% reduction in the probability of incorrect selection is possible by using an unequal rather than equal allocation. Simple formulae are given for the appropriate selection rule and unequal allocation in large samples.     

"C语言程序设计"双语教学探讨

以自动化学院自动化专业双语教学为研究对象,分析"C语言程序设计"进行双语教学的重要性、必要性,提出了"分组教学"的方法,并讨论了英文教材的选取原则,双语教学的课堂讲授法,作业与考试形式等问题.     

Racial conflict and the malignancy of identity

This paper demonstrates how our sense of identity can emerge out of mere markers of social distinction that may have no innate significance, but, nevertheless, spread to various aspects of our lives and be the root of conflict. The basis of such conflicts could arise from the use of race to form conditional judgments about people's behavior. Moreover, there are contexts where racial conflict is inevitable even though, if individuals had common knowledge of one another's preferences, there would be no conflict. It is argued that this kind of conflict, where many individuals have no innate aggressive preference, is widespread and understanding the process that gives rise to such conflict is the key to crafting effective policy that contains it.     

A comparative study on a permutation statistic

We studied asymptotic distribution and finite sample properties of a randomly weighted permutation statistic. The asymptotic normality and the finite sample simulations derived from our studies provided theoretical and numerical justifications for distributional assumption of many useful test statistics used in identifying spatial autocorrelations of mapped data. We compared a new method in computing the mean and the approximated variance of the randomly weighted D statistic, a special permutation statistic, with the Walter’s conditional method. In the numerical illustration of the method, we calculated the standardized values of the D statistic by subtracting the mean from the D statistic and dividing the difference by the standard deviation for the standardized mortality ratios (SMRs) and the life expectancies among the 48 states of the continental USA. Spatial autocorrelations of the SMRs and the life expectancies were found to be statistically significant.     

关于C语言指针定义的讨论

在教学和实践中发现,C语言指针定义的信息量不足,难于解释指针使用的许多方面。本文大胆地剖析了已有的定义,从中找出问题所在,并试图加以改进。还结合实例给出了“拟构”概念,较好地说明了相关知识尤其是指针与数组的关系。