证券投资预测的马氏链法和E-Bayes法

本文提出了两种证券投资预测方法-马氏链法和E-Bayes法.首先对数据进行分组,然后在此基础上应用马氏链法和E-Bayes法的理论建立预测模型,最后结合实际问题进行了计算,两种方法的预测结果是一致的.     

对称熵损失下成功概率p的E-Bayes估计

研究对称熵损失下成功概率p的Bayes估计和E-Bayes估计,证明了前者的存在性及唯一性.模拟结果表明E-Bayes估计优于极大似然估计和Bayes估计.并将E-Bayes方法应用在证券投资预测之中,预测效果较好.     

状态概率的E-Bayes估计与多层Bayes估计

在文献[1]中提出了参数估计的一种方法--E-Bayes估计并给出了状态概率的E-Bayes估计的定义、E-Bayes估计公式、预测模型及其在证券投资中应用,本文在此基础上将给出状态概率的多层Bayes估计、状态概率的E-Bayes估计的性质--E-Bayes估计,多层Bayes估计的关系.最后,给出模拟算例.     

可靠度的E-Bayes估计、性质及应用

对二项分布的可靠度,提出了一种新的参数估计方法——E-Bayes估计法.在不同先验分布下,给出可靠度的E-Bayes估计和多层Bayes估计,并给出可靠度的E-Bayes估计的性质——E-Bayes估计和多层Bayes估计的关系.最后,给出了模拟算例,结果表明本文提出的方法可行且便于应用.     

Pascal分布的参数估计

对Pascal分布,提出了参数估计的一种新方法——E-Bayes估计法.给出了可靠度的E-Bayes估计的定义,在此基础上给出了可靠度的E-Bayes估计公式,并给出了可靠度的E-Bayes估计的性质——E-Bayes估计和多层Bayes估计的关系.最后,给出了模拟算例,结果表明本文提出的E-Bayes估计法可行且便于应用.     

无失效数据情形指数分布失效率的E-Bayes估计

提出了一种新的可靠性参数估计方法——E-Bayes估计法.对寿命服从指数分布的产品,在无失效数据情形给出失效率的E-Bayes估计的定义、E-Bayes估计,并在此基础上给出了E-Bayes估计的性质——可靠性参数的E-Bayes估计和多层Bayes估计的关系.最后,结合发动机的实际问题进行了计算,结果表明提出的方法可行且便于应用.     

失效概率的E-Bayes估计及其性质

该文提出了参数的一种新估计方法----- E-Bayes估计法. 在无失效数据情形, 给出了失效概率的E-Bayes估计的定义,在此基础上给出了失效概率的E-Bayes估计, 并给出了失效概率的E-Bayes估计的性质----- E-Bayes估计和多层Bayes估计的关系.最后, 给出了模拟算例, 结果表明该文提出的E-Bayes估计法可行且便于应用.     

产品可靠度的E-Bayes估计

提出了参数估计的一种新方法——E-Bayes估计法.对Pascal分布,给出了可靠度的E-Bayes估计的定义(在先验分布中有一个超参数情形),在此基础上给出了可靠度的E-Bayes估计,并给出了可靠度的E-Bayes估计性质——E-Bayes估计和多层Bayes估计的关系.最后,给出了模拟算例,结果表明本文提出的E-Bayes估计法可行且便于工程应用.     

失效率的E-Bayes估计和多层Bayes估计

提出了一种可靠性参数的估计方法—E-Bayes估计法,对寿命服从指数分布的产品,在无失效数据情形,给出了失效率的E-Bayes估计的定义、E-Bayes估计和多层Bayes估计,并在此基础上给出了E-Bayes估计的性质.最后,结合发动机的实际问题进行了计算,结果表明E-Bayes估计法可行且便于应用.     

失效率的综合E-Bayes估计

该文提出了可靠性参数的一种新估计方法综合E-Bayes估计法.在无失效数据情形下给出了失效率的E-Bayes估计的定义,并给出了失效率的E-Bayes估计。在引进失效信息后，给出了失效率的E-Bayes估计，并在此基础上给出了失效率和其它参数的综合E-Bayes估计。最后，结合实际问题进行计算，结果表明该文提出的方法可行且便于应用。     

对称熵损失下成功概率P的E—Bayes估计

研究对称熵损失下成功概率P的Bayes估计和E—Bayes估计,证明了前者的存在性及唯一性．模拟结果表明E-Bayes估计优于极大似然估计和Bayes估计．并将E—Bayes方法应用在证券投资预测之中,预测效果较好．     

不合格品率的一个估计方法

本提出了一种参数的估计方法——E Bayes估计法．对产品的不合格品率,给出了E Bayes估计的定义和E Bayes估计,并在此基础上给出了E Bayes估计的性质和多层Bayes估计。最后,给出了模拟计算,结果表明本提出的方法可行且便于应用。     

参数的E Bayes估计法及其应用

提出了参数的一种估计方法—— E Bayes估计法 ,对寿命服从指数分布的产品 ,在失效率的先验分布为 Gamma分布时 ,给出了失效率的 E Bayes估计和多层 Bayes估计 ,并在此基础上给出了失效率和可靠度的 E Bayes估计的性质 .结合实际问题进行了计算 ,结果表明提出的 E Bayes估计法可行且便于应用 .     

A Bayesian Approach to the Two-period Style-goods Inventory Problem with Single Replenishment and Heterogeneous Poisson Demands

This paper presents a model of the two-period style-goods inventory problem for a firm which stocks many hundreds of distinctive items having heterogeneous Poisson demands. The model uses a Bayesian procedure for forecast and probability revisions based on an aggregation-by-items scheme. These revised forecasts are then incorporated into a model which is used to derive the optimal inventory-stocking policies which maximize expected profit during the season. The model is illustrated using an actual case study of inventory planning for unframed poster art.     

An adaptively managed dynamic portfolio selection model using a time-varying investment target according to the market forecast

In this paper, we propose an adaptive investment strategy (AIS) based on a dynamic portfolio selection model (DPSM) that uses a time-varying investment target according to the market forecast. The DPSM allows for flexible investments, setting relatively aggressive investment targets when market growth is expected and relatively conservative targets when the market is expected to be less attractive. The model further allows investments to be liquidated into risk-free assets when the market forecast is pessimistic. By dynamically determining the investment target, the DPSM allows construction of portfolios that are more responsive to market changes, while eliminating the possibility of the model becoming infeasible under certain market conditions. When the proposed DPSM is implemented in real-life investment scenarios using the AIS, the portfolio is rebalanced according to a predefined rebalancing cycle and the model’s input parameters are estimated on each rebalancing date using an exponentially weighted moving average (EWMA) estimator. To evaluate the performance of the proposed approach, a 7-year investment experiment was conducted using historical stock returns data from 10 different stock markets around the world. Performance was assessed and compared using diverse measures. Superior performance was achieved using the AIS proposed herein compared with various benchmark approaches for all performance measures. In addition, we identified a converse relationship between the average trading volume of a market and the value of the weighting parameter prescribed to the EWMA estimator, which maximizes cumulative returns in each market.     

The suboptimality of composite forecasts derived from posterior probabilities

There has been quite a common practice of formulating composite forecasts using the posterior probabilities derived from Bayesian model discrimination methods. It is shown that such composite forecasts are normally suboptimal in the sense that there exists an alternative composite forecast with a strictly lower expected error.     

证券分析师业绩预测和投资评级准确性实证分析

本文以国内证券分析师业的业绩预测和投资评级为研究对象,从投资评级的准确性、投资建议赢利性、业绩预测误差及其来源等几个方面进行了实证分析。研究结果表明,证券分析师的投资建议无论是在短期还是中长期均不能产生显著的超额收益,业绩预测误差是导致投资评级失误的原因之一,而业绩预测误差主要源于分析师对公司层面信息的错误判断。