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Effect of Real Estate News Sentiments on the Stock Returns of Swedbank and SEB Bank 房地产新闻情绪对瑞典银行和SEB银行股票收益的影响
Pub Date : 2021-12-01 DOI: 10.2478/erfin-2021-0005
Yuliia Puzanova, M. Eratalay
Abstract This paper explores the effect of real estate news sentiment on the stock returns of Swedbank and SEB Bank, which are leading banks in Sweden and the Baltic region. For this purpose, we have selected sentiments from news about real estate in the markets of these banks in Sweden, Estonia, Latvia, and Lithuania between 4 January 2016 and 19 February 2019. Estimation results showed that sentiments about the housing market affect stock returns for both banks, and the effect is different for positive and negative news. We also found that there is a difference in the stock returns of these banks in terms of when and to what extent they react to news coming from the Baltic States and Sweden. Moreover, we found that the number of negative news affects the stock returns of the banks more than the strength of the news. We also apply several GARCH specifications to explore if negative and positive news affect the volatility processes to some extent. We found out that the volatilities are explained better by the GJR-GARCH and NAGARCH models. Overall, the volatility of SEB stock returns depends more on the news sentiments compared to the volatility of Swedbank stock returns.
摘要本文探讨了房地产新闻情绪对瑞典和波罗的海地区领先银行瑞典银行和SEB银行股票回报的影响。为此,我们选择了2016年1月4日至2019年2月19日期间瑞典、爱沙尼亚、拉脱维亚和立陶宛这些银行市场上有关房地产的新闻。估计结果表明,对房地产市场的情绪影响了两家银行的股票回报,而对正面和负面消息的影响是不同的。我们还发现,这些银行的股票回报率在何时以及在多大程度上对来自波罗的海国家和瑞典的消息做出反应方面存在差异。此外,我们发现负面新闻的数量对银行股票收益的影响大于新闻的强度。我们还应用了几个GARCH规范来探讨负面和正面消息是否在一定程度上影响波动过程。我们发现GJR-GARCH和NAGARCH模型可以更好地解释挥发物。总体而言,与瑞典银行股票回报的波动性相比,SEB股票回报的变化更多地取决于新闻情绪。
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引用次数: 0
Corporate Tax Aggressiveness and Corporate Investment Expenditure in Nigeria and Ghana 尼日利亚和加纳的企业税收侵略性与企业投资支出
Pub Date : 2021-12-01 DOI: 10.2478/erfin-2021-0007
Ifeanyi Francis Osegbue, John Ogbonnia Obasi, Chitom Rachael John-Akamelu, Chizoba Mary Nwoye
Abstract This paper analyzes the effect of cash flow from corporate tax aggressiveness on corporate investment expenditure in Nigeria and Ghana from 2010 to 2017. The sampled outcome is measured by estimating pooled ordinary least squares, as well as random and fixed effects models. The study uses dynamic models to draw significance because it corrects for endogeneity, cross-sectional dependence, serial correlation, and heteroscedasticity by including instruments that are uncorrelated with the regressors in the underlying routine during estimation. The corporate tax aggressiveness indicators are tax saving, effective tax rate, book-tax difference, and temporary tax difference - with firm size as the control variable. Findings, among others, reveal that tax aggressiveness has a statistically significant influence on corporate investment expenditure in both countries. This provides evidence that tax aggressiveness is positive and that its coefficients are statistically significant to the tax aggressiveness variables; in particular, tax saving and effective tax rate maintained consistent positive and statistically significant relationships to corporate investment expenditure across all model specifications. In other words, an increase in tax saving and effective tax rate boost the total and new investment expenditure in both countries. Other findings show that a large difference between income reported on financial statements and income reported on tax return reduces corporate total and new investment expenditure in both countries. Furthermore, a proportionate increase in investment maintenance expenditure occurs when a book-tax gap changes in Nigeria. This is because managers reduce taxable income in order to increase investment maintenance expenditure. For the control variables, firm size boosts corporate investment expenditure in both countries.
摘要本文分析了2010-2017年尼日利亚和加纳企业税收优惠带来的现金流对企业投资支出的影响。通过估计合并的普通最小二乘法以及随机和固定效应模型来测量采样结果。该研究使用动态模型来得出显著性,因为它通过在估计过程中在基本例程中包括与回归变量不相关的工具来校正内生性、截面依赖性、序列相关性和异方差。企业税收积极性指标是以企业规模为控制变量的节税、有效税率、账面税差和临时税差。除其他外,调查结果显示,税收优惠对两国企业投资支出都有统计上的显著影响。这提供了证据,证明税收侵略性是正的,并且其系数对税收侵略性变量具有统计学意义;特别是,在所有模型规范中,节税和有效税率与企业投资支出保持着一致的正相关关系,并且在统计上具有显著意义。换言之,税收储蓄和有效税率的增加增加了两国的总投资支出和新投资支出。其他研究结果表明,财务报表中报告的收入和纳税申报表中报告的收益之间的巨大差异减少了两国的企业总投资和新投资支出。此外,当尼日利亚的账面税收差距发生变化时,投资维持支出会相应增加。这是因为管理者为了增加投资维持支出而减少应纳税所得额。就控制变量而言,企业规模促进了两国的企业投资支出。
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引用次数: 0
Integrated Reporting and Firm Value in the Nigerian and South African Oil and Gas Sector 尼日利亚和南非石油和天然气行业的综合报告和公司价值
Pub Date : 2021-12-01 DOI: 10.2478/erfin-2021-0008
Chizoba Mary Nwoye, P. Egbunike, Ifeanyi Francis Osegbue
Abstract This paper evaluates the effect of integrated reporting on the firm value of oil and gas companies comparing the two biggest economies in Africa from 2015 to 2018. The study used Tobin’s Q ratio as a proxy to firm value, while integrated reporting was broken down into five capitals of integrated reporting: intellectual capital, human capital, natural capital, social/responsibility capital, and financial capital. Preliminary analyses were conducted, such as descriptive statistics and correlation matrix. In analyzing the data, the study adopted the panel multiple regression method to identify the possible effect of integrated reporting on the firm value of oil and gas companies in Nigeria and South Africa using the Hausman test to choose between fixed and random effects. The result shows that integrated reporting has a significant positive effect on firm values in South Africa and Nigeria. We, therefore, recommend that integrated reporting in Nigeria should be used as a mandatory reporting system because this will encourage stakeholder understanding, instead of trying to source sustainability reports after examining financial statements.
摘要本文对2015年至2018年非洲两个最大经济体的石油和天然气公司的公司价值进行了综合报告评估。本研究使用Tobin’s Q比率作为企业价值的代理,而综合报告则被分解为综合报告的五种资本:智力资本、人力资本、自然资本、社会/责任资本和财务资本。进行了描述性统计和相关矩阵等初步分析。在分析数据时,采用面板多元回归方法,采用Hausman检验在固定效应和随机效应之间进行选择,确定综合报告对尼日利亚和南非油气公司公司价值可能产生的影响。结果表明,综合报告对南非和尼日利亚的企业价值观有显著的正向影响。因此,我们建议尼日利亚将综合报告作为一项强制性报告制度,因为这将鼓励利益相关者理解,而不是在审查财务报表后试图获取可持续发展报告。
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引用次数: 0
An Innovative Artificial Intelligence and Natural Language Processing Framework for Asset Price Forecasting Based on Islamic Finance: A Case Study of the Saudi Stock Market 基于伊斯兰金融的资产价格预测创新人工智能和自然语言处理框架——以沙特股市为例
Pub Date : 2021-12-01 DOI: 10.2478/erfin-2021-0009
Klemens Katterbauer, Philippe Moschetta
Abstract Artificial intelligence has transformed the forecasting of stock prices and the evaluation of companies. Novel techniques, allowing the real-time processing of large amounts of data, have enabled the use of data on various external factors to improve the forecasting of the company’s value and stock price. Although conventional approaches solely focus on the use of quantitative data, history has shown that news announcements and statements may significantly affect the performance of the stock value of companies. We present an innovative framework for integrating a nonlinear autoregressive network with a natural language processing approach to analyze stock price movements and forecast stock prices. The framework analyzes and processes the company’s financial statements, determining indicative factors and transforming them into categorical parameters which are then integrated into a nonlinear autoregressive network to estimate and forecast the company’s stock price. The analysis of several Saudi companies listed in the Tadawul index affirms the improved estimation of the stock price and the possibility of a more precise prediction of long-term stock price evolution.
摘要人工智能已经改变了股票价格预测和公司评估。允许实时处理大量数据的新技术,使得能够使用各种外部因素的数据来改进对公司价值和股价的预测。尽管传统的方法只关注定量数据的使用,但历史表明,新闻公告和声明可能会显著影响公司股票价值的表现。我们提出了一个创新的框架,将非线性自回归网络与自然语言处理方法相结合,以分析股价走势并预测股价。该框架分析和处理公司的财务报表,确定指示性因素,并将其转换为分类参数,然后将其集成到非线性自回归网络中,以估计和预测公司的股价。对Tadawul指数中上市的几家沙特公司的分析证实了对股价估计的改进,以及对长期股价演变进行更精确预测的可能性。
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引用次数: 2
Predicting the Price of Crude Oil and its Fluctuations Using Computational Econometrics: Deep Learning, LSTM, and Convolutional Neural Networks 使用计算计量经济学预测原油价格及其波动:深度学习,LSTM和卷积神经网络
Pub Date : 2021-09-29 DOI: 10.2478/ERFIN-2021-0006
Rayan H. Assaad, S. Fayek
Abstract There has been a renewed interest in accurately forecasting the price of crude oil and its fluctuations. That said, this paper aims to study whether the price of crude oil in the United States (US) could be predicted using the stock prices of the top information technology companies. To this end, time-series data was collected and pre-processed as needed, and three architectures of computational neural networks were tested: deep neural networks, long-short term memory (LSTM) neural networks, and a combination of convolutional and LSTM neural networks. The findings suggest that LSTM networks are the best architectures to predict the crude oil price. The outcomes of this paper could potentially help in making the oil price prediction mechanism a more tractable task and in assisting decision-makers to improve macroeconomic policies, generate enhanced macroeconomic projections, and better assess macroeconomic risks.
准确预测原油价格及其波动又引起了人们的兴趣。也就是说,本文的目的是研究是否可以使用顶级信息技术公司的股价来预测美国的原油价格。为此,收集时间序列数据并根据需要进行预处理,并测试了三种计算神经网络架构:深度神经网络、长短期记忆(LSTM)神经网络以及卷积和LSTM神经网络的组合。研究结果表明,LSTM网络是预测原油价格的最佳架构。本文的结果可能有助于使油价预测机制成为一项更容易处理的任务,并有助于决策者改善宏观经济政策,产生更好的宏观经济预测,更好地评估宏观经济风险。
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引用次数: 11
Does Foreign Presence Influence the Level of Firm Technical Efficiency? Evidence from Africa 外资存在是否影响企业技术效率水平?来自非洲的证据
Pub Date : 2021-06-01 DOI: 10.2478/erfin-2021-0001
A. Orji, Jonathan E. Ogbuabor, G. Aza, Onyinye I. Anthony‐Orji
Abstract This study investigates the impact of foreign direct investment on the level of firm technical efficiency in West Africa. Firms from Nigeria, Ghana, Sierra Leone and the Gambia were sampled due to the fact that they used to belong to the British Empire. The data, sourced from the World Bank enterprise survey, covers the period from 2006 to 2018, with the sampled countries having data for different years. A time varying stochastic frontier production function for panel was developed for this enquiry. The findings of the study show that foreign direct investment has a significant and positive impact on both technical efficiency and productivity of firms in West Africa. Controlling for other effects, international trade and firm size both have positive and significant effects on firm level technical efficiency. Therefore, policies should be aimed at encouraging more inflows and maintenance of the stock of foreign direct investment to avert divestments. This includes, but is not limited to, ensuring sociopolitical stability and introducing policies that would remove bureaucratic bottlenecks from the path of direct investment inflow and simplify the process of doing business in these countries.
摘要本研究探讨了外商直接投资对西非企业技术效率水平的影响。来自尼日利亚、加纳、塞拉利昂和冈比亚的公司被抽样调查,因为它们曾经属于大英帝国。这些数据来自世界银行的企业调查,涵盖了2006年至2018年期间,抽样国家的数据来自不同年份。针对这一问题,提出了一个时变随机前沿生产函数。研究结果表明,外国直接投资对西非企业的技术效率和生产率都有显著的积极影响。在控制其他影响的情况下,国际贸易和企业规模对企业水平技术效率均有显著的正向影响。因此,政策的目的应该是鼓励更多的流入和维持外国直接投资的存量,以避免撤资。这包括但不限于确保社会政治稳定,并出台政策,消除直接投资流入道路上的官僚主义瓶颈,简化在这些国家开展业务的过程。
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引用次数: 0
A Probabilistic-Based Portfolio Resampling Under the Mean-Variance Criterion 均值方差准则下基于概率的投资组合重采样
Pub Date : 2021-06-01 DOI: 10.2478/erfin-2021-0003
Anmar Al Wakil
Abstract An abundant amount of literature has documented the limitations of traditional unconstrained mean-variance optimization and Efficient Frontier (EF) considered as an estimation-error maximization that magnifies errors in parameter estimates. Originally introduced by Michaud (1998), empirical superiority of portfolio resampling supposedly lies in the addressing of parameter uncertainty by averaging forecasts that are based on a large number of bootstrap replications. Nevertheless, averaging over resampled portfolio weights in order to obtain the unique Resampled Efficient Frontier (REF, U.S. patent number 6,003,018) has been documented as a debated statistical procedure. Alternatively, we propose a probabilistic extension of the Michaud resampling that we introduce as the Probabilistic Resampled Efficient Frontier (PREF). The originality of this work lies in addressing the information loss in the REF by proposing a geometrical three-dimensional representation of the PREF in the mean-variance-probability space. Interestingly, this geometrical representation illustrates a confidence region around the naive EF associated to higher probabilities; in particular for simulated Global-Mean-Variance portfolios. Furthermore, the confidence region becomes wider with portfolio return, as is illustrated by the dispersion of simulated Maximum-Mean portfolios.
摘要大量文献已经证明了传统的无约束均值方差优化和有效边界(EF)的局限性,EF被认为是一种估计误差最大化,放大了参数估计的误差。最初由Michaud(1998)提出,投资组合重采样的经验优势据称在于通过基于大量自举重复的平均预测来解决参数不确定性。然而,为了获得独特的resampled Efficient Frontier (REF,美国专利号6,003,018),对重新采样的组合权重进行平均已被记录为一个有争议的统计程序。另外,我们提出了Michaud重采样的概率扩展,即我们引入的概率重采样有效边界(PREF)。这项工作的独创性在于通过在均值-方差-概率空间中提出PREF的几何三维表示来解决REF中的信息丢失问题。有趣的是,这种几何表示说明了与高概率相关的朴素EF周围的置信区域;特别是对于模拟的全局均值方差投资组合。此外,随着投资组合收益的增加,置信区间也会变宽,这可以通过模拟最大均值投资组合的离散度来说明。
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引用次数: 0
Dynamic Connectivity in a Financial Network Using Time-Varying DCCA Correlation Coefficients 基于时变DCCA相关系数的金融网络动态连通性
Pub Date : 2021-06-01 DOI: 10.2478/erfin-2021-0004
P. Ferreira, Oussama Tilfani, E. Pereira, Cleónidas Tavares, H. Pereira, My Youssef El Boukfaoui
Abstract This paper aims to analyse the connectivity of 13 stock markets, between 1998 and 2019, with a time-varying proposal, to evaluate evolution of the linkage between these markets over time. To do so, we propose to use a network built based on the correlation coefficients from the Detrended Cross-Correlation Analysis, using a sliding windows approach. Besides allowing for analysis over time, our approach also enables us to verify how the network behaves for different time scales, which enriches the analysis. We use two different properties of networks: global efficiency and average grade, to measure the network’s connectivity over time. We find that the markets under analysis became more connected before the subprime crisis, with this behavior extending even after the Eurozone crisis, showing that during extreme events there is an increase in financial risk, as found in the international literature.
摘要本文旨在分析1998年至2019年间13个股票市场的连通性,并提出时变建议,以评估这些市场之间的联系随时间的演变。为此,我们建议使用基于去趋势互相关分析的相关系数构建的网络,使用滑动窗口方法。除了允许随时间进行分析外,我们的方法还使我们能够验证网络在不同时间尺度下的行为,这丰富了分析。我们使用网络的两个不同特性:全局效率和平均等级,来衡量网络随时间的连通性。我们发现,被分析的市场在次贷危机之前变得更加紧密,这种行为甚至在欧元区危机之后也在延续,这表明在极端事件期间,金融风险会增加,正如国际文献中所发现的那样。
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引用次数: 3
Can Market Making of Last Resort Calm the European Stock Markets? The Result of Quantile Regressions on a Sample of Six European Countries 最后的做市商能让欧洲股市平静下来吗?六个欧洲国家样本的量化回归结果
Pub Date : 2021-03-02 DOI: 10.2478/ERFIN-2021-0002
Mercédesz Mészáros, Dóra Sallai, G. Kiss
Abstract Stock market indices are the benchmark of valuation uncertainty. Funding conditions can have an impact on the discounting process. Therefore time-premium, country-specific premia as well as (un)conventional monetary policy should be considered when studying market volatility. The aim of our research is to identify the effects of the unconventional monetary policy of European central banks on stock markets and to explore specific aspects of the relationship between domestic quantitative easing and the influence of the ECB, through the pattern of small, open economies in Europe. This study employs quantile panel regression to compare the 25% (calming) and 75% (stressed) scenarios of quarterly averaged conditional variance and compares them with an ordinary linear panel regression.
股票市场指数是衡量估值不确定性的基准。资金状况会对贴现过程产生影响。因此,在研究市场波动时,应考虑时间溢价、国别溢价以及(非)常规货币政策。我们研究的目的是确定欧洲央行非常规货币政策对股票市场的影响,并通过欧洲小型开放经济体的模式,探索国内量化宽松政策与欧洲央行影响之间关系的具体方面。本研究采用分位数面板回归来比较季度平均条件方差的25%(平静)和75%(压力)情景,并将其与普通线性面板回归进行比较。
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引用次数: 0
Forecasting the Yield Curve for Poland 预测波兰的收益率曲线
Pub Date : 2020-12-01 DOI: 10.2478/erfin-2020-0006
T. Kostyra, Micha l Rubaszek
Abstract This paper evaluates the accuracy of forecasts for Polish interest rates of various maturities. We apply the traditional autoregressive Diebold-Li framework as well as its extension, in which the dynamics of latent factors are explained with machine learning techniques. Our findings are fourfold. Firstly, they show that all methods have failed to predict the declining trend of interest rates. Secondly, they suggest that the dynamic affine models have not been able to systematically outperform standard univariate time series models. Thirdly, they indicate that the relative performance of the analyzed models has depended on yield maturity and forecast horizon. Finally, they demonstrate that, in comparison to the traditional time series models, machine learning techniques have not systematically improved the accuracy of forecasts.
摘要本文评估了波兰不同期限利率预测的准确性。我们应用了传统的自回归Diebold Li框架及其扩展,其中用机器学习技术解释了潜在因素的动力学。我们的发现有四个方面。首先,它们表明所有的方法都无法预测利率的下降趋势。其次,他们认为动态仿射模型无法系统地优于标准的单变量时间序列模型。第三,它们表明所分析的模型的相对性能取决于收益成熟度和预测期。最后,他们证明,与传统的时间序列模型相比,机器学习技术并没有系统地提高预测的准确性。
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引用次数: 1
期刊
Econometric Research in Finance
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