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Robust efficient frontier analysis with a separable uncertainty model
Robust efficient frontier analysis separable uncertainty model
2015/7/10
Mean-variance (MV) analysis is often sensitive to model mis-specification or uncertainty, meaning that the MV efficient portfolios constructed with an estimate of the model parameters (i.e., the expec...
We consider an optimizing process (or parametric optimization problem), i.e., an optimization problem that depends on some parameters. We present a method for imputing or estimating the objective func...
Consistency of Multidimensional Convex Regression
nonparametric regression multidimensional convex functions asymptotic properties consistency
2015/7/6
Convex regression is concerned with computing the best fit of a convex function to a data set of n observations in which the independent variable is (possibly) multidimensional. Such regression ...
债务期限结构与过度投资的敏感性分析——基于上市公司所有制差异
债务结构 过度投资 国有控股企业
2015/5/20
本文从债权人保护角度分析了不同产权性质下短期债务的运用对企业过度投资的影响。研究发现，短期债务的大量运用能够显著缓解企业过度投资。国有控股企业由于存在预算软约束，减少了债权人对企业风险的关注度，短期债务比例明显低于民营企业，削弱了短期债务对企业过度投资的相机治理效果。对于民营企业，债权人会更多地采用短期贷款的方式监督企业的投资决策，减少企业的过度投资行为。
64 卦数量对称平衡系统及比干八宫的发现，既可以更正《易经》 64
卦卦序分布无数理对称平衡的缺陷，又揭示了 64 卦系统集“相覆对峙或阴阳对
称、卦序数对称平衡和卦数量对称平衡”三位于一体。
Counting solutions to binomial complete intersections
Affine systems algebraically closed field characteristics of zero
2014/12/25
We study the problem of counting the total number of affine solutions of a system of n binomials in n variables over an algebraically closed field of characteristic zero. We show that we may decide in...
Isothermic submanifolds of symmetric $R$-spaces
Classic theory 3 - space line surface the space of submanifolds R dollars and losses
2014/12/24
We extend the classical theory of isothermic surfaces in conformal 3-space, due to Bour, Christoffel, Darboux, Bianchi and others, to the more general context of submanifolds of symmetric $R$-spaces w...
COHOMOLOGY OF CONGRUENCE SUBGROUPS OF SL4(Z). III
Cohomology group group congruence sparse matrix zero matrix calculation
2014/12/24
In two previous papers we computed cohomology groups for a range of levels , where is the congruence subgroup of consisting of all matrices with bottom row congruent to mod . In this note we update th...
TORSION IN THE COHOMOLOGY OF CONGRUENCE SUBGROUPS OF SL(4, Z) AND GALOIS REPRESENTATIONS
Reverse calculation congruence subgroup the group of cohomology homologous yields Galois calculating torsional prime
2014/12/24
We report on the computation of torsion in certain homology the-ories of congruence subgroups of SL(4, Z). Among these are the usual group cohomology, the Tate-Farrell cohomology, and the homology of ...
PIECES OF NILPOTENT CONES FOR CLASSICAL GROUPS
Nilpotent cone orbit nilpotent cone the number of dollars
2014/12/24
We compare orbits in the nilpotent cone of type $B_n$, that of type $C_n$, and Kato's exotic nilpotent cone. We prove that the number of $\F_q$-points in each nilpotent orbit of type $B_n$ or $C_n$ eq...
微观绿色GDP——企业环境成本核算初探
绿色GDP 企业环境成本 成本核算
2013/8/22
目前世界通行的GDP核算体系，是一种不能全面反映国民经济实际情况的核算体系，其核算数字存在“虚增”成分，因为它不包含对环境污染和生态破坏的成本费用。要想真实反映国民经济状况，必须使用绿色GDP核算体系，因为它综合了环境和生态的核算，是一种全新的GDP核算体系。要建立良好的绿色GDP核算体系，就需要精确地计算出环境污染和生态破坏的费用，即环境成本。
中国税收政策对居民消费影响的实证分析
税收政策 税制改革 居民消费
2013/8/21
从长期看公司所得税和房产税对居民消费是挤出的，流转税和个人所得税则对居民消费有正向效应；短期内流转税和房产税对居民消费的影响不显著，企业所得税抑制了居民消费，个人所得税则促进了居民的消费。下一步应逐步降低流转税之比重，企业所得税率应在宽税基的基础上逐渐降低，逐步建立分类与综合征收相结合的现代个人所得税制，在财产税制的框架内尽快推进房产税制改革。
个人利益，分配公平与再分配偏好——基于中国微观数据的实证研究
再分配偏好 个人利益 分配公平 内生性
2013/8/21
本文从中国居民再分配偏好较高这一现状出发，致力于从“个人利益”和“分配公平”两个角度对其进行解释。根据Roemer的理论，本文从“成功可控性”的角度构造了反映居民分配公平观念的变量，并利用中国综合社会调查(2006)的数据和有序选择模型进行实证，我们发现：中国居民的再分配偏好不但存在对自身利益的考虑，也有显著的追求分配公平的动机，越认为“受过良好的教育”、“聪明才智”、“社会关系”、“认识有权的人...