Some Results on Comparing the Quantiles of Dependent Groups

Recently, Lombard derived an extension of the Doksum–Sievers shift function to dependent groups. This article suggests using a particular numerical method for determining the critical value, reports on the ability of the method to control the probability of a Type I error when sample sizes are small, and it provides comparisons with methods aimed at comparing deciles. It is found that for continuous distributions, Lombard's method performs well and in particular has high power relative to the other two methods considered. But when tied values can occur, now it can have relatively poor power; a method based on the Harrell-Davis estimator is found to give more satisfactory results.     

Factor Analysis Revisited – How Many Factors are There?

We suggest a procedure to improve the overall performances of several existing methods for determining the number of factors in factor analysis by using alternative measures of correlation: Pearson's, Spearman's, Gini's, and a robust estimator of the covariance matrix (MCD). We examine the effect of the choice of the covariance used on the number of factors chosen by the KG rule of one, the 80% rule, the Minimum average partial (MAP), and the Parallel Analysis Methodology (PAM). Extensive simulations show that when the entire (or part) of the data come from heavy-tail (lognormal) distributions, ranking the variables which come from non symmetric distributions improves the performances of the methods. In this case, Gini is slightly better than Spearman. The PAM and MAP procedures are qualitatively superior to the KG and the 80% rules in determining the true number of factors. A real example involving data on document authorship is analyzed.     

财务指标在股票投资决策中的有用性:基于中国证券市场的实证研究

本文以中国A股上市公司为研究对象,采用因子分析和Logistic回归分析的方法,研究财务指标对股票超额回报的解释能力。研究发现,就A股市场整体而言,通过财务指标预测股票超额回报的能力没有得到有力的证明,但回归模型对超额回报预测的准确率高于随机分布的准确率,表明市场上还是存在一定的盈利模式；影响股票超额回报的财务指标随时间变化而变化,表明中国证券市场尚未成熟稳定；而且,反映公司发展能力的财务指标几乎出现在所有的回归结果中,表明此类财务指标对股票投资者具有较强的指导意义。     

企业政治策略形成影响因素——中国经验

本文运用因子分析与广义估计方程(GEEs)对中国企业政治策略选择的影响因素进行了实证研究.研究结果表明:(1)中国企业政治策略包括直接参与、财务刺激、代言人、制度创新、政府关联以及经营活动政治等六个层面的策略;(2)企业层面的影响因素中,企业规模、闲散资产以及多元化水平等因素均对不同层面的政治策略具有显著影响;(3)行业层面的影响因素中,行业管制程度、相对市场份额、企业间合作程度及行业内企业数均对不同层面的政治策略选择具有显著影响;(4)经营活动政治策略、代言人策略与财务刺激策略在行业问存在显著差异;(5)行业管制程度对财务刺激策略的行业间变异程度具有显著影响,相对市场份额、企业间合作程度对行业间代言人策略的变异程度具有显著影响,行业内企业数对行业间经营活动政治策略的变异程度具有显著影响.     

中国公司声誉测量指标构建的实证研究

作为一种特殊的无形资产,公司声誉能够帮助企业有效整合企业内外的资源,但是由于认知的不同,公司声誉在不同的文化体系下有很大的差异.美国的公司声誉研究所通过多年的研究认为,美国人从产品和服务、工作环境、社会责任、愿景和领导、财务绩效、情感吸引等六个因子去衡量公司声誉,并把这六个因子的指标体系称为"誉商","誉商"的指标体系已经在世界许多国家得到了认同.本文首先对美国"誉商"指标在中国的适应性进行了研究,得到了一个五因子的指标体系;然后根据中国企业的现实情况,寻找与中国公司声誉密切相关的补充指标,对中国公司的声誉构成进行了探索,得到了一个七因子的指标体系,并认为社会背景因子和跨国经营能力因子是中国公司声誉的专用因子.     

地方国有邮电通信企业偿债能力的综合分析与评价

应用因子分析法对地方国有邮电通信企业偿债能力进行了多因素下的综合分析与评价，介绍了分析与评价过程。     

Information Systems Management Issues: Reporting and Relevance*

Reports of key information systems issues have been published over the last two decades in many journals. Leading IS journals (e.g., MIS Quarterly, Information & Management, among others) have published key IS management issue reports every three or four years over the last 15 years, and will probably continue to provide such reports in the future. Although these reports claim to provide decisional guidance to practitioners, researchers, consultants, etc., the authors in their experience have noted concerns about their usefulness. While not questioning the validity of the methods and analysis conducted in these studies, we address two important questions in this article: the manner of reporting of the key issue results (which might be misleading), and the relevance of the results (are they providing what they intended to?). We hope that our discussion will provide new perspectives in making resource allocation decisions to both readers and authors of key issue articles.     

快速成形件精度的影响因素及对策

快速成形是现代制造业快速响应市场必备的过程--快速成形前处理、分层叠加成形、后处理,对影响快速成形所制作的模型(快速成形件)精度的影响因素作了全面的分析.最后提出了提高快速成形件精度的对策.