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Polish Academy of Sciences

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Adam Marszałek, PhD

Cracow University of Technology (PL)

Doctoral thesis
2017-11-30 Skierowane liczby rozmyte w modelowaniu i symulacji finansowych szeregów czasowych  (PK)
supervisor -- Prof. Tadeusz Burczyński, PhD, DSc, IPPT PAN
co-supervisor -- Michał Bereta, PhD, PK
 

Recent publications
1.  Marszałek A., Burczyński T., Forecasting day-ahead spot electricity prices using deep neural networks with attention mechanism, Journal of Smart Environments and Green Computing, ISSN: 2767-6595, DOI: 10.20517/jsegc.2021.02, Vol.1, pp.21-31, 2021

Abstract:
This paper presents a novel approach to forecast hourly day-ahead electricity prices. In recent years, many predictive models based on statistical methods and machine learning (deep learning) techniques have been proposed. However, the approach presented in this paper focuses on the problem of constructing a fair and unbiased model. In this considered case, unbiased means that the model can increase prediction accuracy and decrease categorical bias across different data clusters. For this purpose, a model combining techniques such as long short-term memory (LSTM) recurrent neural network, attention mechanism, and clustering is created. The proposed model’s main feature is that the attention weights for LSTM hidden states are calculated considering a context vector given for each sample individually as the cluster center to which the sample belongs. In training mode, the samples are iteratively (one time per epoch) clustered based on representation vectors given by the attention mechanism. In the empirical study, the proposed model was applied and evaluated on the Nord Pool market data. To confirm that the model decreases categorical bias, the obtained results were compared with results of similar LSTM models but without the proposed attention mechanism.

Keywords:
deep learning, electricity prices forecasting, time series forecasting, attention mechanism, debiasing, Nord Pool data

Affiliations:
Marszałek A. - Cracow University of Technology (PL)
Burczyński T. - IPPT PAN
2.  Marszałek A., Burczyński T., Ordered fuzzy random variables: Definition and the concept of normality, INFORMATION SCIENCES, ISSN: 0020-0255, DOI: 10.1016/j.ins.2020.08.120, pp.1-12, 2020

Abstract:
The concept of fuzzy random variable combines two sources of uncertainty: randomness and fuzziness, whereas the model of ordered fuzzy numbers provides a representation of inaccurate quantitative data, and is an alternative to the standard fuzzy numbers model proposed by Zadeh. This paper develops the model of ordered fuzzy numbers by defining the concept of fuzzy random variables for these numbers, called further ordered fuzzy random variables. Thanks to the well-defined arithmetic of ordered fuzzy numbers (existence of neutral and opposite elements) and the introduced ordered fuzzy random variables; it becomes possible to construct fully fuzzy stochastic time series models such as e.g., the autoregressive model or the GARCH model in the form of classical equations, which can be estimated using the least-squares or the maximum likelihood method. Furthermore, the concept of normality of ordered fuzzy random variables and the method to generate pseudo-random ordered fuzzy variables with normal distribution are introduced.

Keywords:
ordered fuzzy numbers, fuzzy random variables, ordered fuzzy random variables, normal ordered fuzzy random variable

Affiliations:
Marszałek A. - Cracow University of Technology (PL)
Burczyński T. - IPPT PAN
3.  Marszałek A., Burczyński T., Modeling and forecasting financial time series with ordered fuzzy candlesticks, INFORMATION SCIENCES, ISSN: 0020-0255, DOI: 10.1016/j.ins.2014.03.026, Vol.273, pp.144-155, 2014

Abstract:
The goal of the paper is to present an experimental evaluation of fuzzy time series models which are based on ordered fuzzy numbers to predict financial time series. Considering this approach the financial data is modeled using Ordered Fuzzy Numbers (OFNs) called further by Ordered Fuzzy Candlesticks (OFCs). The use of them allows modeling uncertainty associated with financial data and maintaining more information about price movement at assumed time interval than comparing to commonly used price charts (e.g. Japanese Candlestick chart). Thanks to well-defined arithmetic of OFN, one can construct models of fuzzy time series, such as an Ordered Fuzzy Autoregressive Process (OFAR), where all input values are OFC, while the coefficients and output values are arbitrary OFN; in the form of classical equations, without using rule-based systems. In an empirical study ordered fuzzy autoregressive models are applied to modeling and predict price movement of futures contracts on Warsaw Stock Exchange Top 20 Index.

Keywords:
Ordered fuzzy number, Directional predictability, Fuzzy autoregressive, Financial time series, Stock return

Affiliations:
Marszałek A. - Cracow University of Technology (PL)
Burczyński T. - IPPT PAN
4.  Marszałek A., Burczyński T., Financial Fuzzy Time Series Models Based on Ordered Fuzzy Numbers, Intelligent Systems Reference Library, ISSN: 1868-4394, DOI: 10.1007/978-3-642-33439-9_4, Vol.47, pp.77-95, 2013

Abstract:
The purpose of this chapter is to present an original concept of financial fuzzy time series models based on financial data in the form of Japanese Candlestick Charts. In this approach the Japanese Candlesticks are modeled using Ordered Fuzzy Numbers (OFN) called further Ordered Fuzzy Candlesticks (OFC). The use of ordered fuzzy numbers allows modeling uncertainty associated with financial data. Thanks to well-defined arithmetic of ordered fuzzy numbers, one can construct models of fuzzy time series, such as e.g. an autoregressive process, where all input values are OFC, while the coefficients and output values are arbitrary OFN, in the form of classical equations, without using rule-based systems. Finally, several applications of these models for modeling and forecasting selected financial time series are presented.

Keywords:
Fuzzy Number, Arithmetic Operation, Autoregressive Process

Affiliations:
Marszałek A. - Cracow University of Technology (PL)
Burczyński T. - other affiliation

List of chapters in recent monographs
1. 
Marszałek A., Burczyński T., Theory and Applications of Ordered Fuzzy Numbers, rozdział: Ordered Fuzzy Candlesticks, Springer International Publishing, pp.183-194, 2017

Conference papers
1.  Marszałek A., Burczyński T., Ordered Fuzzy GARCH Model for Volatility Forecasting, Advances in Intelligent Systems and Computing, ISSN: 2194-5357, DOI: 10.1007/978-3-319-66824-6_42, Vol.642, pp.480-492, 2018

Abstract:
A volatility forecasting comparative study between the most popular original GARCH model and the same model defined based on concepts of Ordered Fuzzy Numbers and Ordered Fuzzy Candlsticks is presented. These approaches offer a suitable tool to handle both imprecision of measurements and uncertainty associated with financial data. Therefore, they are particularly useful for volatility forecasting, since the volatility is unobservable and a proxy for it is used (realised volatility). In presented study, based on intra-daily data of theWarsaw Stock Exchange Top 20 Index (WIG 20), one showed that based on the adjusted-R squared and several prediction measurements, the fuzzy approach does perform better than the original GARCH model and forecasts more precisely in both the in-sample and out-of-sample predictions

Keywords:
Volatility forecasting, Realized volatility, Ordered fuzzy number, Kosinski's fuzzy number, Ordered fuzzy candlestick, Ordered fuzzy GARCH model, Financial high-frequency data

Affiliations:
Marszałek A. - Cracow University of Technology (PL)
Burczyński T. - IPPT PAN
2.  Marszałek A., Burczyński T., Fuzzy Portfolio Diversification with Ordered Fuzzy Numbers, 16th International Conference, ICAISC 2017, 2017-06-11/06-15, Zakopane (PL), DOI: 10.1007/978-3-319-59063-9_25, pp.279-291, 2017

Abstract:
In this paper, we consider a multi-objective portfolio diversification problem under real constraints in fuzzy environment, where the objective is to minimize the variance of portfolio and maximize expected return rate of portfolio. The return rates of assets are modeled using concept of Ordered Fuzzy Candlesticks, which are Ordered Fuzzy Numbers. The use of them allows modeling uncertainty associated with financial data based on high-frequency data. Thanks to well-defined arithmetic of Ordered Fuzzy Numbers, the estimators of fuzzy-valued expected value and covariance can be computed in the same way as for real random variables. In an empirical study, 20 assets included in the Warsaw Stock Exchange Top 20 Index are used to compare considered fuzzy model with crisp mean-variance model

Keywords:
Ordered fuzzy number, Kosinski's fuzzy number, Ordered fuzzy candlestick, Fuzzy portfolio diversification, Fuzzy returns, Multi-objective optimization, Financial high-frequency data

Affiliations:
Marszałek A. - Cracow University of Technology (PL)
Burczyński T. - IPPT PAN

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