Efficiency Bounds for Missing Data Models With Semiparametric Restrictions

This paper shows that the semiparametric efficiency bound for a parameter identified by an unconditional moment restriction with data missing at random (MAR) coincides with that of a particular augmented moment condition problem. The augmented system consists of the inverse probability weighted (IPW) original moment restriction and an additional conditional moment restriction which exhausts all other implications of the MAR assumption. The paper also investigates the value of additional semiparametric restrictions on the conditional expectation function (CEF) of the original moment function given always observed covariates. In the program evaluation context, for example, such restrictions are implied by semiparametric models for the potential outcome CEFs given baseline covariates. The efficiency bound associated with this model is shown to also coincide with that of a particular moment condition problem. Some implications of these results for estimation are briefly discussed.     

Strategic Supply Function Competition With Private Information

A finite number of sellers (n) compete in schedules to supply an elastic demand. The cost of each seller is random, with common and private value components, and the seller receives a private signal about it. A Bayesian supply function equilibrium is characterized: The equilibrium is privately revealing and the incentives to rely on private signals are preserved. Supply functions are steeper with higher correlation among the cost parameters. For high (positive) correlation, supply functions are downward sloping, price is above the Cournot level, and as we approach the common value case, price tends to the collusive level. As correlation becomes maximally negative, we approach the competitive outcome. With positive correlation, private information coupled with strategic behavior induces additional distortionary market power above full information levels. Efficiency can be restored with appropriate subsidy schemes or with a precise enough public signal about the common value component. As the market grows large with the number of sellers, the equilibrium becomes price‐taking, bid shading is on the order of 1/n, and the order of magnitude of welfare losses is 1/n². The results extend to inelastic demand, demand uncertainty, and demand schedule competition. A range of applications in product and financial markets is presented.     

面向应用型网络工程方向教学体系的改革与研究

针对不同的"网络工程"就业方向,构建和优化了分层次的教学课程体系,并结合实际情况就"双师型"教师培养、实验室及校外实习基地建设中的一些困难进行了探讨,为应用型网络工程方向的专业建设提供了一种可借鉴的思路。     

校地合作:藏区高校特色发展探索

藏区高校,以立足藏区、依靠藏区、服务藏区作为自身办学的根本宗旨和出发点,迫切需要加强与地方的紧密联系。藏区由于社会经济发展不平衡,也迫切需要高校为其提供人才和智力支持。藏区高校与地方开展合作,是双方共同发展的需要。文章从藏区高校与地方合作的紧迫性、合作的内容、以及合作的路径等方面,对藏区高校校地合作进行了思考和探索,期望对藏区高校和地方的发展具有参考意义。     

基于双重评价型测评方法的高校学生社团会员满意度测评——以湘潭大学为例

高校学生社团会员满意度测评具有重要的意义,以湘潭大学学生社团会员满意度测评为实例,对高校学生社团会员满意度测评中运用双重评价型测评方法进行了分析,对该测评方法的不足进行了简要的讨论,并指出了高校学生社团会员满意度测评需要继续研究的领域。     

考虑徐变影响的双面组合连续箱梁应力分析

研究钢 混凝土双面组合连续箱梁的徐变问题。根据混凝土徐变后的双面组合连续箱梁的截面应力自相平衡,内力仍为零这一条件,通过平衡方程得到负弯矩区截面的曲率,进而得到截面的应力计算公式;通过算例分析双面组合连续箱梁的应力重分布情况。     

《庄子·应帝王》新论

从东西文化的视角对《庄子·应帝王》做了全新的且具有当代意识的阐释。分析认为：人类的主体生命和客体的绝对本体的＂道＂（帝王）,原本就是处于双行一体的深度契合中;只要能自觉破除或超越人类自我造作的种种观念的障蔽,则宇宙和人类演化历史的＂一体多元＂本相与现象的运动,也就是＂浑沌＂和凿＂浑沌＂双行一体,双向逆反的演化密义会自显,＂浑沌＂和凿＂浑沌＂是牺牲与复活同在的密义也会自显,这些观点具有创新性和领先性。     

中国内地和香港所得税合作的影响及法律对策

2006年8月中国内地与香港重新签订的避免双重征税和防止偷漏税的安排,给予香港居民纳税人以诸多的税收优惠.此安排虽然有助于巩固香港的离岸金融中心地位,但是有效反避税措施的缺乏则极易招致纳税人对该安排的滥用,损害内地税收利益.鉴于该安排未损及内地单方面实施反逃避税法律和措施的权利,因此,建立和完善相关的反逃避税法律和措施,进一步完善与香港的所得税税务合作,是内地在维护税收利益目标下的必然选择.     

信用风险中回收率分布的双Beta模型

本文研究了随机回收率的分布,建立了回收率的双Beta分布密度模型,它具有双峰分布的特点,这与Moody公司的最新研究相吻合,弥补了现有回收率分布模型均为单峰的不足。利用基于数论网格的序贯优化算法对所建模型的参数做出了估计,借助于核密度估计的工具,进行了实证分析,结果表明双Beta模型的拟合误差很小,远小于Beta模型的误差,它是表示回收率理想的模型。最后给出了抽取双Beta分布随机数的方法。     

《蜗居》的双重言说和意识形态策略解码

《蜗居》借双重言说和意识形态策略,在暴露＂幸福＂＂小三＂的生活中对＂社会道德＂进行遮蔽,温情脉脉地卸除了男性对于家庭的道德责任,是一种崇尚彻头彻尾的＂堕落美学＂,是坏的大众文化文本,其本质是＂美学的堕落＂。