CONVERGENCE AND PREDICTION OF PRINCIPAL COMPONENT SCORES IN HIGH-DIMENSIONAL SETTINGS

A number of settings arise in which it is of interest to predict Principal Component (PC) scores for new observations using data from an initial sample. In this paper, we demonstrate that naive approaches to PC score prediction can be substantially biased towards 0 in the analysis of large matrices. This phenomenon is largely related to known inconsistency results for sample eigenvalues and eigenvectors as both dimensions of the matrix increase. For the spiked eigenvalue model for random matrices, we expand the generality of these results, and propose bias-adjusted PC score prediction. In addition, we compute the asymptotic correlation coefficient between PC scores from sample and population eigenvectors. Simulation and real data examples from the genetics literature show the improved bias and numerical properties of our estimators.     

以研究性学习促进中国文学教学创新

研究性学习是集研究和学习为一体的一种综合性学习方法,它着重培养学生的自学能力、合作精神及创新意识。作为文学类课程的教师,应认识研究性学习在文学类课程教学中的重要性,在文学课的教学中充分运用研究性学习来促进教学的创新,培养学生的创新能力。     

公共关系是不是塑造形象的学问?——与詹姆斯·格鲁尼格教授商榷

美国著名的公关专家詹姆斯·格鲁尼格教授反对在公共关系中使用“形象”和“塑造形象”这两个词语 ,认为塑造形象意味着为组织说好话而无需对公众负责任。本文认为 ,公共关系是塑造形象的学问 ,而且强调塑造良好的形象必须以负责任的行为和实际的业绩为基础     

我国国债市场化建设存在的问题及其对策

成熟的国债市场 ,是一个国家金融市场的基石 ,不但为我国金融体系提供巨大的流动性资本 ,而且为全社会投资者提供了低风险的投资工具 ,同时也是央行货币政策的重要载体。本文对我国国债市场的现状与存在的问题进行了有益的探讨 ,并对国债市场化建设提出了相应的对策     

Testing for a trend in exponential means: A two-moment approximation to the null distribution of the likelihood-ratio statistic

The likelihood-ratio test statistic for testing homogeneity of exponential means with an ordered alternative has a rather complex null distribution. Expressions for the mean and variance of its null distribution are derived, and the accuracy of a two-moment chi-squared approximation is studied. The coefficients needed to implement the approximation are tabled. The application of these results in testing for a constant versus a nondecreasing intensity in a nonhomogeneous Poisson process is also discussed.     

Generic Strategies and Business Performance: an Empirical Study of the Screw Machine Products Industry

Select businesses in industry may attempt to compete through distinct strategies. But some may be successful in adopting distinct strategic profiles while others may not prove successful. In this study it was expected that six different groups of businesses might be present in the empirical exploration – those competing successfully with the low cost strategy and those competing unsuccessfully with this strategy; those competing successfully with the differentiation strategy and those competing unsuccessfully with this strategy; and those competing successfully with low cost and differentiation strategies and those competing unsuccessfully with these strategies. The results of the investigation portray the presence of three strategic profiles. They are unsuccessful low cost businesses with the lowest performance, unsuccessful differentiated businesses with the second lowest performance, and successful businesses with combination strategies with the highest performance.     

Examining the Relationship Between Female Inmate Homosexual Behavior and Attitudes Toward Homosexuality and Homosexuals

Most sociologists and penologists tend to shy away from studying inmate attitudes toward homosexuality and homosexuals. Researchers within the corrections field who focus on prison sexuality typically conduct their research on consensual samesex sexual behavior and sexual coercion. The focus of the present study, however, was to ascertain female inmates' attitudes toward homosexuality and homosexuals while exploring the role ofseveral predictor variables on their attitudes. Specifically, the authors examine the relationship between female inmate homosexual behavior and attitudes toward homosexuality and homosexuals. Because of the number of items pertaining to attitudes toward homosexuality and homosexuals, factor analysis was conducted to examine whether the items measured similar constructs. Results ofthe factor analysis revealed two distinct factors/issues:civil/personal rights and personal deviance models. The mostsalient, and only statistically significant, variables in the civil/personal rights model were age, homosexual activity prior to incarceration, and homosexual activity during incarceration. Homosexual behavior during incarceration was the only statistically significant predictor of the personal deviance model.     

流态化速冻装置布风板实验研究

针对目前流态化速冻装置在速冻过程中速度分布和压力分布不均匀导致食品流化状态与冻结效果不佳等缺点,课题组从布风板孔隙形状（正方形、三角形和圆形）、孔隙率和孔隙分布3个角度出发,设计出16种布风板,以提高装置对不同种类食品的适应性要求,提高装置能效比从而达到节能的目的。文中研究设计的布风板可改善流态化速冻装置在冻结过程中的流化程度与冻结效果,同时不同孔隙形状的设计也满足食品颗粒形状的多样性需求。     

新主体性如何断定？——与张文初“新主体性”理论商榷

张文初的《能力主体与时间本位:新主体性的两重断定》一文对新主体性的两重断定都有着无法克服的理论漏洞。在能力主体的断定上,对能力与欲望关系的理解陷入了二元论的误区,而在时间本位的断定上则是回到了传统的时空关系上。新主体性的理论应该在价值论的立场上以“价值冲动”概念来穿越传统主体理论的主体与客体、主体的身与心及主体的知、情、意。