186 research outputs found

    Study on option pricing based on artificial intelligence

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    期权理论是20世纪世界经济学领域最伟大的发现之一。由于期权具有良好的规避风险、风险投资和价值发现等功能,且表现出灵活性和多样性特点,故近30年来,特别是上个世纪90年代以来,期权成为最有活力的衍生金融产品,得到了迅速发展和广泛的应用。对于期权价格的正确定价不仅对于学术界而且对于金融市场的实际操作者来说都是十分重要的。目前已经有许多对于欧式期权定价的参数化模型,包括著名的Black-Scholes模型。但是由于有着一些不真实,与真实市场不协调矛盾的隐含参数,所以它们的定价效果并不如我们所期望的那么好。为了避免这些参数化模型的缺陷,基于人工智能的欧式期权定价模型越来越受到关注。同时,如我们所知,美...The option theory is one of the most great discovery in the world economic field in 20th century . Owing to the function of the risk of elusion , venture investment , value discovery and the characteristic of agility and multiplicity , option has been the most great-hearted derivative product and has gained rapid development and broad application since 90th of the last century . It is important to...学位:博士后院系专业:经济学院_金融工程学号:201017003

    Application of Stationary Wavelet Support Vector Machines for the Prediction of Economic Recessions

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    This paper examines the efficiency of various approaches on the classification and prediction of economic expansion and recession periods in United Kingdom. Four approaches are applied. The first is discrete choice models using Logit and Probit regressions, while the second approach is a Markov Switching Regime (MSR) Model with Time-Varying Transition Probabilities. The third approach refers on Support Vector Machines (SVM), while the fourth approach proposed in this study is a Stationary Wavelet SVM modelling. The findings show that SW-SVM and MSR present the best forecasting performance, in the out-of sample period. In addition, the forecasts for period 2012-2015 are provided using all approaches

    Financial time series forecasting using artificial neural networks

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    This study builds an artificial neural network framework with the use of stacked autoencoders (SAE) to extract deep denoised features, and long short-term memory (LSTM) to generate forecasts for the next-day adjusted closing price of S&P500. Data for seven different stock indices, technical indicators, and macroeconomic variables is used to train three different models: a 'price model' which predicts the next-day price, a 'change model' which predicts the relative change in price, and a ’binary model’ which predicts the probability of a price increase. The models were judged based on predictive accuracy and profitability. Results show the models either fail to generalize well or fall prey to a vicious minimum approximating a naive predictor. Furthermore, the models appear particularly poor at predicting breaks in the series, likely due to their infrequency. This might provide evidence supporting the efficient market hypothesis.Este estudo constrói modelos de redes neuronais artificiais com o uso de "stacked autoencoders" (SAE) para extrair variáveis latentes sem ruído e "long short-term memory" (LSTM) para gerar previsões para o "next-day adjusted closing price" do S&P500. Dados para sete índices de ações diferentes, indicadores técnicos e variáveis macroeconómicas são usados para treinar três modelos diferentes: um 'modelo de preço' que prevê o preçoo do dia seguinte, um 'modelo de mudança que prevê a mudança relativa no preçoo e um 'modelo binário' que prevê a probabilidade de um aumento de preço. Os modelos foram avaliados com base na sua precisão preditiva e lucratividade. Os resultados mostram que os modelos falham em generalizar bem ou caem num mínimo vicioso que se aproxima de um "naive predictor". Além disso, os modelos parecem particularmente fracos a prever quebras na série, provavelmente devido à sua infrequência. Isto pode fornecer evidências que apoiam a hipótese do mercado eficiente

    Lagged correlation-based deep learning for directional trend change prediction in financial time series

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    Trend change prediction in complex systems with a large number of noisy time series is a problem with many applications for real-world phenomena, with stock markets as a notoriously difficult to predict example of such systems. We approach predictions of directional trend changes via complex lagged correlations between them, excluding any information about the target series from the respective inputs to achieve predictions purely based on such correlations with other series. We propose the use of deep neural networks that employ step-wise linear regressions with exponential smoothing in the preparatory feature engineering for this task, with regression slopes as trend strength indicators for a given time interval. We apply this method to historical stock market data from 2011 to 2016 as a use case example of lagged correlations between large numbers of time series that are heavily influenced by externally arising new information as a random factor. The results demonstrate the viability of the proposed approach, with state-of-the-art accuracies and accounting for the statistical significance of the results for additional validation, as well as important implications for modern financial economics.Comment: 11 pages, 4 figure

    Nonlinear analysis and prediction of Bitcoin return’s volatility

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    This paper mainly studies the market nonlinearity and the prediction model based on the intrinsic generation mechanism (chaos) of Bitcoin’s daily return’s volatility from June 27, 2013 to November 7, 2019 with an econophysics perspective, so as to avoid the forecasting model misspecification. Firstly, this paper studies the multifractal and chaotic nonlinear characteristics of Bitcoin volatility by using multifractal detrended fluctuation analysis (MFDFA) and largest Lyapunov exponent (LLE) methods. Then, from the perspective of nonlinearity, the measured values of multifractal and chaos show that the volatility of Bitcoin has short-term predictability. The study of chaos and multifractal dynamics in nonlinear systems is very important in terms of their predictability. The chaos signals may have short-term predictability, while multifractals and self-similarity can increase the likelihood of accurately predicting future sequences of these signals. Finally, we constructed a number of chaotic artificial neural network models to forecast the Bitcoin return’s volatility avoiding the model misspecification. The results show that chaotic artificial neural network models have good prediction effect by comparing these models with the existing Artificial Neural Network (ANN) models. This is because the chaotic artificial neural network models can extract hidden patterns and accurately model time series from potential signals, while the benchmark ANN models are based on Gaussian kernel local approximation of non-stationary signals, so they cannot approach the global model with chaotic characteristics. At the same time, the multifractal parameters are further mined to obtain more market information to guide financial practice. These above findings matter for investors (especially for investors in quantitative trading) as well as effective supervision of financial institutions by government

    Stories from different worlds in the universe of complex systems: A journey through microstructural dynamics and emergent behaviours in the human heart and financial markets

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    A physical system is said to be complex if it exhibits unpredictable structures, patterns or regularities emerging from microstructural dynamics involving a large number of components. The study of complex systems, known as complexity science, is maturing into an independent and multidisciplinary area of research seeking to understand microscopic interactions and macroscopic emergence across a broad spectrum systems, such as the human brain and the economy, by combining specific modelling techniques, data analytics, statistics and computer simulations. In this dissertation we examine two different complex systems, the human heart and financial markets, and present various research projects addressing specific problems in these areas. Cardiac fibrillation is a diffuse pathology in which the periodic planar electrical conduction across the cardiac tissue is disrupted and replaced by fast and disorganised electrical waves. In spite of a century-long history of research, numerous debates and disputes on the mechanisms of cardiac fibrillation are still unresolved while the outcomes of clinical treatments remain far from satisfactory. In this dissertation we use cellular automata and mean-field models to qualitatively replicate the onset and maintenance of cardiac fibrillation from the interactions among neighboring cells and the underlying topology of the cardiac tissue. We use these models to study the transition from paroxysmal to persistent atrial fibrillation, the mechanisms through which the gap-junction enhancer drug Rotigaptide terminates cardiac fibrillation and how focal and circuital drivers of fibrillation may co-exist as projections of transmural electrical activities. Financial markets are hubs in which heterogeneous participants, such as humans and algorithms, adopt different strategic behaviors to exchange financial assets. In recent decades the widespread adoption of algorithmic trading, the electronification of financial transactions, the increased competition among trading venues and the use of sophisticated financial instruments drove the transformation of financial markets into a global and interconnected complex system. In this thesis we introduce agent-based and state-space models to describe specific microstructural dynamics in the stock and foreign exchange markets. We use these models to replicate the emergence of cross-currency correlations from the interactions between heterogeneous participants in the currency market and to disentangle the relationships between price fluctuations, market liquidity and demand/supply imbalances in the stock market.Open Acces

    Wavelet multiresolution analysis of financial time series

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    Understanding the nature of oil fluctuations using 1 neutral network moving average: A study on the returns of crude oil futures

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    This paper describes the profitability of technical trading rules which are enhanced by the use of neural networks on crude oil futures contracts traded on Chicago Merchantile Exchange and on Bursa Derivative Malaysia. The profitable returns on the futures contract on crude light oil futures traded from 2/1/2008 to 31/12/2014 offer a piece of evidence on the ability of technical trading rules using neural networks to outperform the threshold benchmark, buy and hold. The results here suggest that it is worthwhile to design, build and develop more robust, machine learning algorithms like neural networks enhanced moving average technical indicator to enhance portfolio returns. The conclusion drawn is that neural network can be used in technical analysis as a predictor for futures market prices

    Quantitative methods in high-frequency financial econometrics: modeling univariate and multivariate time series

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