A Comparison of Nonparametric Tests of Weak Separability for Annual and Quarterly Data on Consumption,Leisure, and Money

Among the most fundamental assumptions made in economics are utility maximization and the separability of the arguments in the representative consumer's utility function. These assumptions are important for theoretical and empirical applications of economics. In this article, we present results from nonparametric tests of these assumptions of consumer behavior. We find that utility maximization generally obtains with either annual or quarterly per capita data on consumption goods, leisure, and relatively liquid monetary assets. Annual data on consumption goods, leisure, and all monetary assets are consistent with utility maximization. There is some evidence in support of using partial adjustment models when estimating quarterly data models of the demand for monetary assets. Further, annual data on consumption goods and leisure and on liquid monetary assets meet the necessary and sufficient conditions for weak separability. These results support the notion of a monetary aggregate more broadly based than currency plus demand deposits. Separability of monetary assets does not obtain for quarterly data.     

金融全球化与“股东导向型”公司治理制度的跨国传播——对中国公司治理改革的社会学分析

自20世纪80年代以来,由于金融全球化和美式“股东资本主义”的兴起,“股东导向型”公司治理制度在全世界的影响越来越大,被誉为最佳公司治理模式或“国际惯例”。它不但影响了德、日等发达国家,也影响了中国等发展中国家和转型国家的公司治理改革。本文认为,“股东导向型”公司治理制度在中国的传播主要由内生性和外生性两大动机驱动,经过两个阶段和通过三种机制完成。第一阶段是在跨国层面,“模仿性同构”机制和“规范性同构”机制发挥了重要作用;第二阶段是在国内企业层面,政府通过法律法规和政策等手段要求企业采用新的公司治理模式,即“强制性同构”机制发挥了主导作用。对中国公司治理改革的社会学分析有助于我们从一个不同于经济学和管理学的新视角加深对中国金融市场和上市公司的理解,对于反思西方新自由主义企业制度,构建具有中国特色的现代企业制度具有较为重要的理论和现实意义。     

On the estimation of the extreme value and normal distribution parameters based on progressive type-II hybrid-censored data

A progressive hybrid censoring scheme is a mixture of type-I and type-II progressive censoring schemes. In this paper, we mainly consider the analysis of progressive type-II hybrid-censored data when the lifetime distribution of the individual item is the normal and extreme value distributions. Since the maximum likelihood estimators (MLEs) of these parameters cannot be obtained in the closed form, we propose to use the expectation and maximization (EM) algorithm to compute the MLEs. Also, the Newton–Raphson method is used to estimate the model parameters. The asymptotic variance–covariance matrix of the MLEs under EM framework is obtained by Fisher information matrix using the missing information and asymptotic confidence intervals for the parameters are then constructed. This study will end up with comparing the two methods of estimation and the asymptotic confidence intervals of coverage probabilities corresponding to the missing information principle and the observed information matrix through a simulation study, illustrated examples and real data analysis.     

On-line expectation–maximization algorithm for latent data models

Summary.  We propose a generic on-line (also sometimes called adaptive or recursive) version of the expectation–maximization (EM) algorithm applicable to latent variable models of independent observations. Compared with the algorithm of Titterington, this approach is more directly connected to the usual EM algorithm and does not rely on integration with respect to the complete-data distribution. The resulting algorithm is usually simpler and is shown to achieve convergence to the stationary points of the Kullback–Leibler divergence between the marginal distribution of the observation and the model distribution at the optimal rate, i.e. that of the maximum likelihood estimator. In addition, the approach proposed is also suitable for conditional (or regression) models, as illustrated in the case of the mixture of linear regressions model.     

浅析企业财务管理目标

关于企业的财务管理目标归纳起来包括利润最大化、股东财富最大化和每股盈余最大化三种基本观点.综合考虑若干主要因素,现代企业财务管理目标应确立为:在履行一定社会责任的基础上,尽可能提高企业权益资本增值率,实现企业价值最大化,实现企业价值最大化的主要途径是提高权益资本增值率。     

股利政策的股东财富效应:来自中国股市的经验证据

国内现有文献关于上市公司股利政策的研究,主要集中在股利政策的信号传递理论、代理成本理论和影响因素三个方面,对上市公司通过股利分配实现股东高回报率的股东财富效应研究较少,而国外从税收政策变化和税负差异的角度研究股利政策财富效应并不适合中国的情况。为此,本文基于我国上市公司股权分置的特殊治理结构,以2003-2004年所有分配股利的上市公司为样本,实证检验了我国上市公司股利政策的股东财富效应。研究表明,分配现金股利使非流通股股东实现高回报率,流通股股东获得股票股利的较高短期收益率。     

A family of skew distributions with mode-invariance through transformation of scale

Recently, a new family of skew distributions was proposed using a specific class of transformation of scale, in which the normalizing constant remains unchanged and unimodality is readily assured. In this paper, we introduce the mode invariance in this family, which allows us to easily study certain properties, including monotonicity of skewness, and incorporate various favorable properties. The entropy maximization for a skew distribution is discussed. A numerical study is also conducted.     

基于多属性决策的未动用油气储量评价方法研究

未动用油气储量综合评价是油田确定区块开发序列,降低开发风险、提高开发效益的关键问题之一,多属性决策为解决该问题提供了理论与方法基础。提出一种集结决策者或专家打分与均方差最大化的组合赋权法,并结合加权算术平均算子构建了基于多属性决策的未动用油气储量评价方法。依据未动用油气储量特征,分析选择11个指标构成评价指标体系。最后,通过中国西北某区26个已探明未动用区块的实证分析,说明该方法合理有效。     

以社会主义生产目的为目标的两大部类最优投资分配——以马克思扩大再生产理论为基础

文章以马克思扩大再生产理论为基础建立了一个最优控制模型,通过最优条件的变换得到了两大部类投资比例的最优算法。该算法表明,在没有发生革命性变革的情况下,两大部类投资比例是常数,这意味着文章推导出的最优解具有普遍意义。