中国政府效率改进的影响因素与中国政府改革——基于主成分分析的研究

我国政府综合效率的改进速度很快,本文从实证角度分析哪些因素对政府综合效率改进构成显著性影响。首先,通过主成分分析提取政府投入、经济政策和社会政策的主成分;其次通过回归分析确认对政府效率改进构成显著性影响的因素;最后,分析回归结果并给出政策建议。主要结论包括,要提高政府效率应该降低政府投入增长速度、强化社会政策、积极促进医疗卫生事业和法制建设的发展,同时降低对经济的干预程度并缩小对经济的干预范围。     

Bayesian forecasting and portfolio decisions using dynamic dependent sparse factor models

We extend the recently introduced latent threshold dynamic models to include dependencies among the dynamic latent factors which underlie multivariate volatility. With an ability to induce time-varying sparsity in factor loadings, these models now also allow time-varying correlations among factors, which may be exploited in order to improve volatility forecasts. We couple multi-period, out-of-sample forecasting with portfolio analysis using standard and novel benchmark neutral portfolios. Detailed studies of stock index and FX time series include: multi-period, out-of-sample forecasting, statistical model comparisons, and portfolio performance testing using raw returns, risk-adjusted returns and portfolio volatility. We find uniform improvements on all measures relative to standard dynamic factor models. This is due to the parsimony of latent threshold models and their ability to exploit between-factor correlations so as to improve the characterization and prediction of volatility. These advances will be of interest to financial analysts, investors and practitioners, as well as to modeling researchers.     

Choice of Portfolios and Fee under Principal -Agent Framework with Uncertain Exit - Time

In the real world, an investor is usually not sure about when he or she will exit investment. She can only make estimation prior. With the growth of the scale of open - end funds which can be subscribed and redeemed at any time. Investors began to pay more attention on problems such as whether the fee is reasonable, the payment can encourage the agent or not. Others would consider if the portfolio that the agent chooses is the best one. This paper considers the principal - agent problem with uncertain exit - time under two cases： the action of the agent is observable and unobservable. We derive close - form expressions of the optimal portfolio and the best fee. Finally an empirical analysis is given based on the data of some open - end funds in China.     

我国高速公路投资体制存在的问题与解决思路

越来越多的投资主体进入了高速公路投资建设领域，逐步形成了由政府全权负责到政府占主导地位再到市场占主导地位的高速公路投资体制。但在目前这种投资体制下，高速公路投资、建设、运营管理的各个环节均暴露出种种不适应经济发展的问题。本文从委托代理理论的视角，提出加大高速公路投资市场化，改革高速公路投资及建设管理体制，推动高速公路的发展。     

联合确定基数合约:对魏茨曼模型的一个改进

本文针对国内外委托代理理论主要局限于理论分析层面而实用性不强的特点,在概要评论有关利润基数确定的相关文献的基础上,通过对美国一家公司委托代理实际案例的研究,提出了旨在能够解决实际委托代理关系的"联合确定基数法"。文章分析了联合确定基数法与棘轮效应模型的区别和联系,以数学方法论证了联合确定基数法的若干命题,描述了公司利润基数确定的利益诱导机制,并对比分析了联合确定基数法与西方教科书中的"激励设计模型"。本文试图以联合确定基数法为核心内容的一次性动态模型,代替蕴含着讨价还价过程的多次性动态模型。     

A medium-N approach to macroeconomic forecasting

This paper considers methods for forecasting macroeconomic time series in a framework where the number of predictors, N, is too large to apply traditional regression models but not sufficiently large to resort to statistical inference based on double asymptotics. Our interest is motivated by a body of empirical research suggesting that popular data-rich prediction methods perform best when N ranges from 20 to 40. In order to accomplish our goal, we resort to partial least squares and principal component regression to consistently estimate a stable dynamic regression model with many predictors as only the number of observations, T, diverges. We show both by simulations and empirical applications that the considered methods, especially partial least squares, compare well to models that are widely used in macroeconomic forecasting.     

信息披露质量与市场流动性

本文以深交所A股上市公司为样本．研究上市公司的信息披露整体质量是否影响公司股票在市场上的流动性。基于分笔高频交易数据．检验集中于流动性的两个关键方面：市场宽度和市场深度。采用稳健的非线性两阶段最小二乘法来克服信息披露的自选择特点所引起的内生性问题。实证结果显示，公司高质量的信息披露能有效提高其股票的市场流动性，这种影响主要是通过缩小市场宽度来达到．而对市场深度的影响不显著。利用市场微观结构的价差分解方法的研究发现．高质量的信息披露提高市场流动性的机制在于有效减轻市场上信息不对称程度。     

新疆城镇居民国内潜在出游力的地区差异分析

本文在分析潜在出游力的影响因素基础上,用主成份分析法简化影响因素的结构,得出了收入水平、交通通讯水平与消费水平是影响各地区城镇居民潜在出游力的基本因素。并通过综合评价法来描述新疆各地州市城镇居民潜在出游力的差异状况,从而为旅游企业开展客源市场提供可靠依据。     

一种石油磺酸盐组分分析的简便方法：膜渗析——质量法

介绍了一种石油磺酸盐组分分析的简便方法－－膜渗析质量法。本方法是根据石油磺酸盐、未反应油及无机盐在不同溶剂中溶解度上的差异，采用膜渗析分离技术使磺化产品中的石油磺酸盐得以纯化分离，并利用分析天平将分离前后的样品进行后进法定量的。由于膜渗析过程较一般的分离技术操作步骤更为简化，从而减免了许多因繁琐操作而引入的系 误差。经研究发现，该方法具有操作简便、损失小、测量精度高等优点，基分析样品的回收率可达９     

利率对我国股市的影响——基于上证综指和深圳成指的实证研究

从理论和实证两方面研究全国银行间同业拆借利率对上证综指和深圳成指的影响,结果表明,利率对沪深两市的负相关变动趋势影响不够显著,原因在于我国利率还没有完全市场化、股票市场效率不高、股票市场投机氛围大于投资氛围。为促进我国股市的健康发展,政府要推进利率市场化改革,减少对人民币的管制,使人民币汇率真正市场化,央行应适时把市场利率作为我国货币政策中介目标,从而有助于实现货币政策的最终目标。