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Evolving fuzzy systems for pricing fixed income options

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Abstract

During the recent decades, option pricing became an important topic in computational finance. The main issue is to obtain a model of option prices that reflects price movements observed in the real world. In this paper we address option pricing using an evolving fuzzy system model and Brazilian interest rate options data. Evolving models are particularly appropriate because they gradually develops the model structure and parameters from a stream of data. Therefore, evolving fuzzy models provide a higher level of system adaptation and learns the system dynamics continuously, an essential attribute in pricing options estimation. In particular, we emphasize the use of the evolving participatory learning methods. The participatory evolving models considered in this paper are compared against the traditional Black’s closed-form formula, artificial neural networks structures, and alternative evolving fuzzy system approaches reported in the literature. Actual daily data used in the experiments cover the period from January 2003 to June 2008. We measure forecast performance of all models and report the statistical tests done for the competing forecast models. The results show that the participatory evolving fuzzy system modeling approach is effective to estimate prices of fixed income options.

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Notes

  1. The Black model (Black 1976) considered in this work follows the Black–Scholes model exactly, except for the assumption that the spot price is a log-normal process which is replaced by the assumption that the forward price at maturity of the option is log-normally distributed. The derivation is identical and the final formula is the same except that the spot price is replaced by the forward price. The forward price represents the undiscounted expected future value.

  2. Brazilian banks usually express their costs of funding in percentage of the published CDI terms, and it can be said that CDI is the relevant cost of opportunity for Brazilian banks.

  3. The data was obtained with BM&FBOVESPA.

  4. The best model, in terms of accuracy, is the one that shown TIC index close to zero.

  5. The p values are shown in parenthesis.

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Acknowledgments

This work was supported by the Brazilian National Research Council, CNPq, and CAPES. The authors thank the anonymous referees for the comments which helped us to improve the paper.

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Correspondence to Rosangela Ballini.

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Maciel, L., Lemos, A., Gomide, F. et al. Evolving fuzzy systems for pricing fixed income options. Evolving Systems 3, 5–18 (2012). https://doi.org/10.1007/s12530-011-9042-1

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