Some Improved Tests for Multivariate One-Sided Hypotheses

Multivariate one-sided hypothesis-testing problems are very common in clinical trials with multiple endpoints. The likelihood ratio test (LRT) and union-intersection test (UIT) are widely used for testing such problems. It is argued that, for many important multivariate one-sided testing problems, the LRT and UIT fail to adapt to the presence of subregions of varying dimensionalities on the boundary of the null parameter space and thus give undesirable results. Several improved tests are proposed that do adapt to the varying dimensionalities and hence reflect the evidence provided by the data more accurately than the LRT and UIT. Moreover, the proposed tests are often less biased and more powerful than the LRT and UIT.     

中、美知识产权争端的原因分析

本文根据协整理论和格兰杰因果检验方法,对我国遭受33调查的数量和美国统计的中国对美出口增长量进行了实证分析。研究表明,我国遭受337调查的数量与美国统计的中国对美国的出口增长量之间存在长期稳定的均衡关系,同时美方统计的中国对美国的出口增长量是中国遭受337调查的格兰杰原因。     

TESTING FOR STATIONARITY OF INFLATION RATES WITH COVARIATES

This paper distinguishes between the stationarity and nonstationarity of inflation in 18 OECD countries through several unit root tests with covariates. These covariate tests are more powerful than the conventional ones through correlated covariates. Both unit root and stationarity null hypotheses are tested in this study. Our empirical results indicate that the efficient univariate unit root tests fail to reject the unit‐root hypothesis for 15 countries, whereas the covariate tests provide strong evidence in support of mean reversion in inflation for almost all countries. Overall, the findings unveil new evidence in favor of stationarity in international inflation. Policy implications on the empirical results are provided as well.     

城乡劳动力流动对收入差距变化的影响——机理分析与实证检验

我国城乡劳动力流动规模与收入差距同时扩大的现象引起了学界的重视,但是,学者们就城乡劳动力流动对收入差距的具体影响存在观点分歧;通过分析城乡劳动力流动影响收入差距的作用机理发现：城乡劳动力流动是扩大还是缩小城乡收入差距,关键取决于进城务工人员工资水平的高低,如果他们的工资水平相对于城镇居民来说太低,则城乡劳动力流动不仅不会带来城乡收入差距的缩小,反而会导致差距扩大。这一结论得到了基于山东省相关时间序列数据分析和计量检验的支持。     

欧债危机下出口企业财务应对之探讨

加入WTO以来,我国外贸出口蓬勃发展,对经济发展起到较大的贡献。但同世界经济的联系愈紧密,世界经济的变换对我国的影响就越大,欧债危机的爆发就极大影响了我国外贸企业对欧盟的出口,使我国外贸企业的经营倍受压力。在危机来临时,企业应该从各方面采取积极的措施应对,以度难关。其中合理有效的财务运作,是最大限度降低欧债危机给企业所带来风险的必要条件之一,并为危机之后的发展提供基础。合理的财务运作包括了资金营运、资金投放、资金分配、资金筹集等四个方面的具体操作,同时强调稳健的财务策略是应对危机的基础。     

浅析市场自由与政府干预

市场自由与政府干预的争论由来已久,把握二者的内涵、理清二者之间的关系是界定二者作用范围的基础。为更清晰的了解二者对经济和社会的作用,实证方面的分析和检验是十分必要的。通过理论演绎和实证检验可以发现,政府干预对经济增长实际上是有阻碍作用的,但是市场的作用也并不是万能的。这决定了政府与市场无法实现有效结合,经济周期必然伴随市场一直存在下去。     

覆盖件拉延模工艺补充面优化设计

文章分析了汽车覆盖件工艺补充面的设计现状与存在问题,给出了优化工艺补充面的方法及使用实例,并阐述了工艺补充面的创建过程,通过优化设计提高补充面的设计效率和质量。     

关于民间融资及司法调节的初步思考——基于温岭市的实证分析

民间融资以民间信用为基础,广泛存在于企业之间、公民之间、企业与公民之间,包括非法与合法融资,融资方式具有广泛性、隐蔽性、复杂性等特征,在经济发展中发挥了积极作用,但其存在的问题和风险亦不容忽视。温岭民营经济发达,涉及民间融资的案件多发,在基层司法中具有一定代表性。本文基于温岭民间融资实况调研,分析民间融资存在的问题及司法调节难点,从政府层面及司法层面探索引导民间资本合理流向的应对举措。     

A new bivariate generalized Poisson distribution

In this paper, a new bivariate generalized Poisson distribution (GPD) that allows any type of correlation is defined and studied. The marginal distributions of the bivariate model are the univariate GPDs. The parameters of the bivariate distribution are estimated by using the moment and maximum likelihood methods. Some test statistics are discussed and one numerical data set is used to illustrate the applications of the bivariate model.     

影响股票价格的两因素模型

我国股票价格的波动较发达国家成熟的金融市场来讲有很大的非理性成分,因而应从整体宏观实体经济发展和货币供应量两个因素来研究股票价格的波动。