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。     

Imagining The Sociological Imagination: the biographical context of a sociological classic

Charles Wright Mills's arguments in The Sociological Imagination are very popular and this paper focuses on the biographical context in which his programmatic statements were occasioned. This breaks new ground by locating The Sociological Imagination and earlier programmatic statements in the professional and personal travails that motivated them. This approach is adopted in order to display the intersection between biography and sociology in Mills's life and career, a feature that he made a central part of sociology's promise. The paper utilizes this approach to reflect on the reasons why The Sociological Imagination became so popular and was able to transcend Mills's general unpopularity at the time of his death; and as part of the explanation of why the dismissal of the book on its publication contrasts with the contemporary view, enabling it to transpose successfully to a time significantly different than at its writing.     

消费者在线交易信任影响因素的实证研究——来自台湾的证据

因特网强大的通讯与实时能力使之成为绝佳的交易平台,随着因特网使用者的日益增加,网络购物在台湾也形成一股热潮,然而在因特网的环境中,网络消费者对网站的信任相当薄弱。为了找出网络消费者对网络商店的信任关键因素,提高网络商店的收益,本研究希望通过实证的数据分析,了解B2C购物环境下消费者信任程度的决定因素,并给出一个整合的理论模型,从而希望对网站经营者提供管理实践的启示。     

Normal random numbers lying on spirals and clubs

Two methods for transforming uniformly distributed random numbers into normally distributed random numbers are considered in conjunction with linear congruential generators. The two-dimensional lattice structure of the uniform random numbers is transformed by the Box-Muller method into a spiral structure and by the polar method into a club-shaped structure. The approximation of the two-dimensional normal distribution and the independence of the associated random variables are discussed.     

A distribution-free test for deprivation dominance

The Raw1sian perspective on social policy pays particular attentionto the least advantaged members of society, but how should "the least advantaged" be identified? The concept of deprivation dominance operationalizes in part the Rawlsian evaluation of the welfare of the least advantaged members of society, but a statistical procedure for testing deprivation dominance is needed. In this paper, we construct a new distribution-free test for deprivation dominance and apply i t to Canadian income survey data