大丰港货物吞吐量的时间序列法预测研究

根据大丰港的历史数据,采用时间序列的回归分析方法对大丰港货物吞吐量进行预测研究。在回归分析法中,通过比较,选择指数模型、高次多项式模型以及支持向量机方法分别对大丰港的货物吞吐量进行模拟预测。对指数模型、多项式模型、支持向量机三种方法的预测结果进行比较,并结合大丰港的实际情况,最终选择使用支持向量机法给出大丰港2012—2016年的货物吞吐量预测值。     

支持向量机在装备维修备件需求量预测中的应用

利用支持向量机回归算法建立备件需求模型,对未来备件需求进行了预测,并结合实例将支持向量回归算法与传统的最小二乘拟合方法作比较。结果表明,支持向量回归算法在预测精度上具有明显的优势,该方法能够较好地适应样本数量较少、需求呈非线性特征的备件预测问题。     

基于支持向量机的舰艇部队作战油料消耗量预测研究

为了提高舰艇部队战时油料消耗量预测的准确性,提出了基于支持向量机的预测方法.分析了支持向量机的回归原理及算法,构造了舰艇部队作战油料消耗量预测模型.针对支持向量机中训练参数对预测结果的影响,采用遗传算法对相关参数取值进行优化,以获得预测性能较好的支持向量机模型.以某舰艇部队参加演习的油料消耗量数据作为实验数据,采用构建的支持向量机模型对舰艇部队油料消耗量进行预测,并将其与BP神经网络进行对比分析.实验结果表明,支持向量机比BP神经网络预测精确度更高,误差更小,有效提高了舰艇部队作战油料消耗量预测的准确性和可靠性.     

基于PSO-SVR的气膜薄壳钢筋混凝土穹顶储仓的工期预测

为客观、合理地进行气膜薄壳钢筋混凝土穹顶储仓的工期预测,提出了基于PSO-SVR的预测方法。采用粒子群算法(particle swarm optimization,PSO)对支持向量回归机(support vector regression,SVR)的参数进行优化,并运用优化后的支持向量回归机对气膜薄壳钢筋混凝土穹顶储仓的工期进行预测。通过实例验证表明:PSO-SVR模型的预测效果优于遗传算法(GA-SVR)和串联型灰色神经网络(SGNN)。     

橡胶充气芯模混凝土填料工程工期预测研究

根据橡胶充气芯模混凝土填料施工的特点,详细分析了影响其工期的因素,结合支持向量回归机(SVR)和粒子群算法(PSO)的优点,建立基于PSO-SVR的橡胶充气芯模混凝土填料工程工期预测模型。通过对某选煤厂混凝土填料施工的数据进行仿真,结果显示:PSO-SVR模型的预测效果优于基于交叉验证的支持向量回归机(CV-SVR)模型以及基于遗传算法的支持向量回归机(GA-SVR)模型。     

关于国债发行规模影响因素的实证分析

本文首先选取影响国债规模的五个因素:国民生产总值、居民储蓄收入、财政赤字、国债累计余额、国债还本付息额,建立向量自回归模型和向量自回归误差修正模型进行协整检验、Granger检验、方差分解,发现这五个因素与国债发行规模之间存在长期均衡关系。然后基于VEC模型预测未来5年的国债发行额,并分析了国债发行规模的适度性。     

基于支持向量机回归算法的航空公司客流量预测研究

在航空公司运营管理过程中,航空客流量预测是其航班计划和机队规划的重要依据。本文介绍了航空客流量预测中常用的几种预测方法,并对他们的特点进行了分析比较;阐述了支持向量机的理论基础和原理,给出了支持向量机的回归模型,并重点探讨了预测模型中核函数的选择方法;在选择适当的参数和核函数的基础上,对航空客流量进行预测,并与BPANN和线性回归算法这两种预测方法进行对比,证明支持向量机回归算法能获得训练最小的相对误差,是相对有效的一种航空客流量预测方法。     

基于经验模态分解的空气质量指数组合预测方法及应用

空气质量发展趋势的预测对于空气污染问题的防治具有非常重要的意义。因此,本文提出了基于经验模态分解(EMD)的空气质量指数(AQI)的一种组合预测方法。我们首先运用经验模态分解(EMD)的方法对非平稳、非线性且呈剧烈波动的时间序列即AQI原始数据进行多尺度分解。其次,我们分别使用4种常用的单项预测方法:灰色预测(GM)、ARIMA、BP神经网络和支持向量回归(SVR),分别对于分解后的本征模态函数(IMF)序列和趋势序列进行预测,得到单项预测结果。为了提高预测的精度,我们选用平均相对误差(MRE)较小的前三种单项预测方法,并对它们的预测结果进行组合预测。最后,运用熵权法分别计算出IMF序列和趋势序列的组合预测值,并将所有预测值求和得到AQI的最终预测结果。为了评价模型的预测效果,我们选用四种常用误差评价指标,对各个模型的预测结果进行评价比较,而仿真实验的结果表明了本文提出的基于经验模态分解的空气质量指数组合预测方法具有较高的预测精度和良好的适用性。     

基于粒子群优化的LS-SVM的福建航空物流需求预测

根据福建省过去十几年航空货物发送量的数据,针对航空物流预测的不确定性,将粒子群优化算法和最小二乘支持向量机相结合,采用粒子群优化最小二乘支持向量机的方法来建立模型。并将优化后的最小二乘支持向量机模型应用于福建省航空物流的需求预测中,而后通过仿真对结果进行验证。     

基于最小二乘支持向量机的短期负荷预测

支持向量机是一种基于统计学理论的新颖的机器学习方法,该方法被广泛用于解决分类和回归问题。文章将最小二乘支持向量机(LS-SVM)算法应用于电力系统短期负荷预测中,并将其预测结果和BP神经网络的预测结果进行比较分析。仿真实验表明,该方法在短期负荷预测中具有很好的预测速度和精度。     

房地产价格波动的影响要素分析与趋势预测

本文围绕当前房地产市场的热点问题,应用协整理论研究了我国房地产价格与其多个影响因素之间的长期均衡关系,建立了多因素的长期均衡模型,并给出了各影响因素对房地产价格波动贡献大小的数量化测度,同时建立了相应的误差修正模型,得出全国房地产市场走势的预期。     

Volatility forecasting in the Bitcoin market: A new proposed measure based on the VS-ACARR approach

This paper proposes a new volatility-spillover-asymmetric conditional autoregressive range (VS-ACARR) approach that takes into account the intraday information, the volatility spillover from crude oil as well as the volatility asymmetry (leverage effect) to model/forecast Bitcoin volatility (price range). An empirical application to Bitcoin and crude oil (WTI) price ranges shows the existence of strong volatility spillover from crude oil to the Bitcoin market and a weak leverage effect in the Bitcoin market. The VS-ACARR model yields higher forecasting accuracy than the GARCH, CARR, and VS-CARR models regarding out-of-sample forecast performance, suggesting that accounting for the volatility spillover and asymmetry can significantly improve the forecasting accuracy of Bitcoin volatility. The superior forecast performance of the VS-ACARR model is robust to alternative out-of-sample forecast windows. Our findings highlight the importance of accommodating intraday information, spillover from crude oil, and volatility asymmetry in forecasting Bitcoin volatility.     

Does oil price variability affect the long memory and weak form efficiency of stock markets in top oil producers and oil Consumers? Evidence from an asymmetric MF-DFA approach

This study examines the asymmetric multifractality and the market efficiency of the stock markets in the countries that are the top crude oil producers (USA, KSA, Canada and Russia) and consumers (Brazil, China, India, and Japan) using an asymmetric multifractal detrended fluctuation analysis (A-MF-DFA) method. The results show evidence of an asymmetric multifractal nature for all markets. Moreover, the multifractality is stronger in the upward movement of the market returns, except in China. The degree of efficiency of the stock markets is shown to be time-varying and experienced a decrease during the 2008 global financial crisis (GFC), but an upside trend occurred during the recent oil price crash followed a significant decline during COVID-19. The stock markets have an anti-persistent feature during GFC and COVID-19, whereas they exhibit a long-term persistent feature during oil price crash. More interestingly, the efficiency of the stock markets of crude oil producers is lower in general than that of oil consumers. Furthermore, the efficiency of the stock market is lower in the downward movement of the market returns than in the upward movement. Asymmetry and oil price uncertainty index are the key driver of the stock markets and can serve as predictor of the stock market dynamics of top oil producers and top oil consumers particularly during COVID-19 and oil price crash.     

Structural analysis and forecast of gold price returns

Gold has multiple attributes and its price is affected by various factors in the market. This paper studies the dynamic relationship between the gold price returns and its affecting factors. Then we use the STL-ETS, neural network and Bayesian structural time series model to predict the gold price returns, and compare their performance with the benchmark models. The results show that the shocks of crude oil returns and VIX have the positive effect on gold price returns, the shocks of the US dollar index have the negative effect on gold price returns. And the fluctuation of gold price returns mainly depends on crude oil price returns shocks. STL-ETS model can accurately fit the fluctuation trend of the gold price returns and improve prediction accuracy.     

Targeted growth rates for long-horizon crude oil price forecasts

This paper proposes growth rate transformations with targeted lag selection in order to improve the long-horizon forecast accuracy. The method targets lower frequencies of the data that correspond to particular forecast horizons, and is applied to models of the real price of crude oil. Targeted growth rates can improve the forecast precision significantly at horizons of up to five years. For the real price of crude oil, the method can achieve a degree of accuracy up to five years ahead that previously has been achieved only at shorter horizons.     

考虑市场力的短期边际电价预测

电价波动较负荷波动剧烈,使得整个电价的预测精度降低。造成这种价格波动的主要原因是由于在电力市场中,发电商拥有的市场力具有能够支配电价上下波动的能力,使得电价的变化更加难以预测。因此市场力在电价预测中是必须考虑的重要因素之一。提出将市场供需比指标作为电价预测的一个输入量,将其引入到预测模型中作为影响电价的因素,使预测精度得到提高。     

Economic policy uncertainty,oil price volatility and stock market returns: Evidence from a nonlinear model

This paper investigates the nonlinear relationship between economic policy uncertainty, oil price volatility and stock market returns for 25 countries by applying the panel smooth transition regression model. We find that oil price volatility has a negative effect on stock returns, and this effect increases with economic policy uncertainty. Furthermore, there is pronounced heterogeneity in responses. First, oil-exporting countries whose economies depend more on oil prices respond more strongly to oil price volatility than oil-importing countries. Second, stock returns of developing countries are more susceptible to oil price volatility than that of developed countries. Third, crisis plays a crucial role in the relation between oil price volatility and stock returns.     

中国股市β系数的多尺度特性分析

本文提出一种基于小波方差和小波协方差的β系数估计方法,并通过小波方差和小波协方差的多尺度分解估计出不同尺度上的风险系数,用该方法对中国证券A股市场分行业及投资组合的β系数进行了多尺度估计分析。实证结果表明,我国股市具有复杂的多尺度波动的特征,不同时间尺度上证券市场所表现出的风险不一样,短期投资的风险主要表现在高频波动,投资者应当考虑低尺度下的β系数,而长期投资风险主要表现为低频波动,应当考虑大尺度下的β系数。     

考虑市场冲击下易变质商品的临时价格折扣模型

文章从零售商的角度出发．考虑当零售商能够预知市场变化并采用价格折扣时所得到的利润收入,同时价格的变化会影响顾客需求的变化。由于采取价格折扣时刻的不同会导致零售商利润收入的不同．文中给出了零售商的最优定价策略,并通过实例对模型进行分析。     

我国房地产价格与宏观经济变量关系的实证分析

在对住宅服务流量模型进行修正的基础上,运用回归分析方法对我国房地产价格与宏观经济变量的长期关系进行了实证分析,研究结果表明:利率对我国房价影响较小,降息对房地产市场的刺激作用有限;房地产市场长期均衡需要人均可支配收入快速增长作保证;为控制房价稳中有降,银行应适度增加房地产信贷,但不能过度。在当前房地产市场出现"拐点"的形势下,政府要根据房地产市场的变化情况来制定相应的宏观调控政策,恢复市场信心,促进房地产市场健康发展。