网络零售平台排名规则对于价格离散的影响

设计了网络零售平台的市场交易模型,包括平台的搜索排名规则、零售商的定价策略以及消费者的购买决策过程。其中,平台的排名规则包括按照价格、评价、销量以及综合排名等4种,零售商的定价策略基于复杂适应系统理论进行设计。在此基础上,运用Repast Simphony 2.3.1开发了网络零售市场计算实验平台,进行仿真实验,研究网络零售平台搜索排名规则对于价格离散的影响。实验结果表明:①网络零售平台无论采用何种搜索排名规则,均会产生价格离散现象;②4种排名规则中,按照价格排名规则产生的价格离散程度最低,综合排名最高,按照评价或销量排名介于这两者之间;③零售商的数量越多,4种排名产生的价格离散差异性越明显,价格离散演化曲线越平稳。     

Forecasting US interest rates and business cycle with a nonlinear regime switching VAR model

This paper introduces a regime switching vector autoregressive model with time‐varying regime probabilities, where the regime switching dynamics is described by an observable binary response variable predicted simultaneously with the variables subject to regime changes. Dependence on the observed binary variable distinguishes the model from various previously proposed multivariate regime switching models, facilitating a handy simulation‐based multistep forecasting method. An empirical application shows a strong bidirectional predictive linkage between US interest rates and NBER business cycle recession and expansion periods. Due to the predictability of the business cycle regimes, the proposed model yields superior out‐of‐sample forecasts of the US short‐term interest rate and the term spread compared with the linear and nonlinear vector autoregressive (VAR) models, including the Markov switching VAR model.     

中国金融市场的风险溢出效应研究——基于溢出指数和复杂网络方法

基于信息溢出视角,采用溢出指数和复杂网络方法,从静态和动态角度测度我国金融市场风险溢出的强度和方向,识别危机中的风险中心及演化.研究表明,我国金融系统风险溢出具有波动性、不确定性及不对称性,整体联动能力较强;各市场滞后效应明显;市场受到冲击时接受风险的程度与其对外溢出风险的程度呈相反变动趋势;货币市场尤其是回购市场是金融系统的风险中心,对外风险溢出效应最强,但在危机发生时相对减弱,而金属、股票、房地产等市场在危机时的风险溢出作用显著增强;债券和外汇市场被动接受风险的能力最强.     

基于信息融合和策略转换的商品期货量化投资策略

在协整理论和分形市场理论基础上,构建一种新的基于信息融合和策略转换的商品期货量化投资策略,并通过实证检验了该策略的有效性和稳健性.部分大宗商品间存在价格联动关系(同涨同跌或A涨B跌).以往研究基于价格联动,设计并验证了商品期货的跨品种统计套利策略,而本文则利用价格联动设计并验证了基于信息融合的趋势跟踪策略.在此基础上,...     

Is implied volatility more informative for forecasting realized volatility: An international perspective

Inspired by the commonly held view that international stock market volatility is equivalent to cross-market information flow, we propose various ways of constructing two types of information flow, based on realized volatility (RV) and implied volatility (IV), in multiple international markets. We focus on the RVs derived from the intraday prices of eight international stock markets and use a heterogeneous autoregressive framework to forecast the future volatility of each market for 1 day to 22 days ahead. Our Diebold-Mariano tests provide strong evidence that information flow with IV enhances the accuracy of forecasting international RVs over all of the prediction horizons. The results of a model confidence set test show that a market's own IV and the first principal component of the international IVs exhibit the strongest predictive ability. In addition, the use of information flows with IV can further increase economic returns. Our results are supported by the findings of a wide range of robustness checks.     

Forecasting Elections

In this paper we assess opinion polls, prediction markets, expert opinion and statistical modelling over a large number of US elections in order to determine which perform better in terms of forecasting outcomes. In line with existing literature, we bias‐correct opinion polls. We consider accuracy, bias and precision over different time horizons before an election, and we conclude that prediction markets appear to provide the most precise forecasts and are similar in terms of bias to opinion polls. We find that our statistical model struggles to provide competitive forecasts, while expert opinion appears to be of value. Finally we note that the forecast horizon matters; whereas prediction market forecasts tend to improve the nearer an election is, opinion polls appear to perform worse, while expert opinion performs consistently throughout. We thus contribute to the growing literature comparing election forecasts of polls and prediction markets. Copyright © 2015 John Wiley & Sons, Ltd.     

股指期货操纵预警的Logistic模型实证研究

通过建立Logistic回归模型判别股指期货被操纵的可能性,将股指期货是否被操纵的问题转化为根据一定时期内股指期货市场的波动性以及流动性指标计算股指期货在一定时间内被操纵的概率,建立了股指期货操纵事件的预警模型.选取香港恒生指数期货操纵时段和对应的非操纵时段,进行了预警模型的实证检验,证明了该模型可以对股指期货操纵事件起到较好的预警作用.研究发现,在股指期货市场中,操纵期与非操纵期的交易量和空盘量显著不同,而反映市场波动性的收益率指标的变化并不显著,对操纵行为是否发生可以使用空盘量和交易量构建模型进行判别.Logistic模型可以很好的识别股指期货市场上的操纵行为,在进入操纵期以后,根据模型计算出的操纵事件的发生概率发生了显著的变化.     

基于极端风险控制的多品种期货套期保值模型

以多品种期货套期保值组合的条件风险价值CVaR度量风险,运用非参数核估计和蒙特卡罗方法模拟现货和期货未来损益情景,通过求解最小CVaR值,建立了基于极端风险控制的多品种期货套期保值模型,解决了在期货价格异常变动的条件下套期保值的风险控制问题.本文以条件风险价值CVaR最小为目标控制套期保值组合的尾部损失,避免了多品种期货套期保值的极端损失,提高了套期保值的效果.采用离散化处理条件风险价值的复杂积分计算收益分布的尾部面积,使得套期保值组合的尾部损失的确定适合任意分布的情况,避免了现有研究对组合收益分布做特定假设的不合理情况,使模型适合任何分布情况的风险控制.     

大股东控制下的内部资本转移与利益冲突

构建了大股东控制下的企业集团内部资本转移优化模型,定量地推导了三种情景下的均衡结果、参与各方福利和影响因素,以此对大股东控制下的内部资本交易行为进行研究.研究发现,理想型内部资本交易实现了资本配置的最优化和社会福利的最大化,形成参与各方"共赢"的局面,实现了集团公司财务目标;附加冲突成本的内部资本交易存在资本转移不足行为,资本交易仍可以持续维持,基本实现集团公司财务目标;侵害型内部资本交易存在过度转移资本行为,资本交易不可持续,实现的财务目标只能是在损害利益相关者的前提下,追求控股股东财富最大化.     

用户部分多归属条件下的双边市场定价策略

在梳理了我国双边市场产业的用户归属特征的基础上,从用户归属行为的视角对双边市场类型进行了划分,并在竞争平台有差异以及用户部分多归属的条件下考虑了双边平台定价的博弈论模型,研究表明用户部分多归属会降低平台的定价和利润,用户单归属时的平台利润最高, 平台具有阻止用户多归属的内在激励,同时平台差异 化会提高竞争平台的利润水平.该研究成果可供双边市场企业制定定价和竞争策略之用,也可供政府进行产业规制提供理论支撑.