上证30指数股市盈率实证分析

通过对2000年上证30指数股市盈率水平及其影响因素进行实证分析,可以发现,其中股息支付率、每股收益增长率、行业平均市盈率对股票P/E值起主要的解释作用,而股本规模因素,解释力却有限,除每股收益增长率外,各变量的相关性与理论分析基本一致.     

安徽高等教育发展规模探讨

规模是高等教育发展四要素中的首要要素。文章在分析安徽高等教育规模发展的现状及差距的基础上 ,论述了加快安徽高等教育规模扩张的必要性与紧迫性 ,预测了未来 10年安徽高等教育的发展规模并就其合理性从多方面进行了论证     

论我国企业编制"增值表"的现实必要性

增值表确能提供相当有用的财务信息 ,它丰富了企业对外报表的内容 ,借鉴国外有关社会责任会计的理论和方法 ,编制有中国特色的增值表 ,不仅必要 ,而且势在必行     

Health Risk,Inequality Indexes,and Environmental Justice

Inequality indexes have long been used to analyze distributions of income. Studies have recently begun to use these tools to evaluate the equity of distributions of environmental harm. In response, issues have been raised regarding the appropriateness of using income-based measures in the context of undesirable outcomes. We begin from first principles, identifying a theoretical preference structure under which income-based tools can be appropriate for ranking distributions of “bads.” While some critiques of existing applications are valid, they are not a justification for rejecting the approach altogether. Instead, we show how standard income-based measures can be adjusted to accommodate bad outcomes. Rather than inequality indexes, we argue that equally distributed equivalents (EDEs) are well-suited for this purpose since they account for levels and dispersion of outcome distributions. The Kolm–Pollak EDE is particularly useful, having the advantage of consistently evaluating both bads and their complementary goods (e.g., mortality risk and survival probability). As an illustration, we show how these tools can inform an environmental justice analysis of a proposed Environmental Protection Agency (EPA) rule addressing indoor air pollution.     

An alternative method for global and partial comparison of two diagnostic systems based on ROC curves

In this paper, an alternative method for the comparison of two diagnostic systems based on receiver operating characteristic (ROC) curves is presented. ROC curve analysis is often used as a statistical tool for the evaluation of diagnostic systems. However, in general, the comparison of ROC curves is not straightforward, in particular, when they cross each other. A similar difficulty is also observed in the multi-objective optimization field where sets of solutions defining fronts must be compared with a multi-dimensional space. Thus, the proposed methodology is based on a procedure used to compare the performance of distinct multi-objective optimization algorithms. In general, methods based on the area under the ROC curves are not sensitive to the existence of crossing points between the curves. The new approach can deal with this situation and also allows the comparison of partial portions of ROC curves according to particular values of sensitivity and specificity of practical interest. Simulations results are presented. For illustration purposes, considering real data from newborns with very low birthweight, the new method was applied in order to discriminate the better index for evaluating the risk of death.     

我国股票市场指数及指数证券投资组合

运用主成分分析法分析我国上海和深圳两个交易所几个市场指数对市场变化的反应情 况, 结果表明两个股票市场的综合指数和A 股指数可以反应市场的变化, 而其他指数不能反 映各自代表的股票市场变化. 由于这4 个指数都不是一个好的投资组合, 要得到与指数一致的 投资收益需要构造指数投资组合. 本文利用多因子定价模型, 结合统计分析和优化方法, 从每 个股票市场上选取20 余支股票, 经过适当的组合就可以得到与指数一致的收益.     

中国旅游业发展若干指标分析与预测

运用回归分析法分析了我国旅游业入境旅游人数、国内旅游人数和旅游总收入与时间及人均国民收入的关系,认为“三大旅游经济指标”与时间(年)和人均国民收入均存在极显著的正相关性。当人均国民收入增加1美元时,入境旅游人数将增加10.218万人次,国内旅游人数将增加71.595万人次,旅游总收入增加6.938亿元人民币;预测到2015年,入境旅游人数将接近2亿人次,国内旅游人数突破20亿人次大关,旅游总收入也将突破2万亿元人民币,年平均增长率分别为9.10%,6.51%和11.16%。     

膨润土常用性能指标的测定分析方法

本文对膨润土常用性能指标的分析测试方法作了系统介绍,主要包括吸兰量、胶质价、活性度、游离酸、脱色率、水分、粒度等的测定方法。