Publication detail

Heterogeneous Agents Model with the Worst Out Algorithm

Author(s): prof. Ing. Miloslav Vošvrda CSc., Lukáš Vácha
Type: Articles in refereed journals
Year: 2007
Number: 1
ISSN / ISBN: ISSN 1802-4696
Published in: AUCO-Czech Economic Review
Publishing place: Praha
Keywords: Efficient Markets Hypothesis, Fractal Market Hypothesis, agents’ investment horizons, agents’ trading strategies, technical trading rules, heterogeneous agent model with stochastic memory, Worst out Algorithm
JEL codes: C61, G14, D84
Suggested Citation:
Grants: IES Research Framework Institutional task (2005-2011) Integration of the Czech economy into European union and its development
Abstract: Heterogeneous agents’ model with the stochastic beliefs formation is considered. Fundamentalists rely on their model employing fundamental information basis to forecast the next price period. Chartists determine whether current conditions call for the acquisition of fundamental information in a forward looking manner rather than relying on the past performance. It was shown that implementation of the agents memory can significantly change the preferences of trader strategies. The Worst out Algorithm (WOA) is used with considered heterogeneous agents’ model to simulate more realistic market conditions. The WOA replaces periodically the trading strategy that has the lowest performance level of all strategies presented on the market by the new one. The memory length of the new strategy that enters the market has the same stochastic structure as the initial strategies. This paper shows an influence of the agent memory as a stochastic process on the heterogeneous agents model with the WOA. Simulations show difference in price returns behaviour between two types of agents’ memory length distribution functions (Uniform and Normal). There is a significant difference in the values of the Hurst exponent and the variance in these two cases. A lower Hurst exponent in the uniform case is caused by a richer spectrum of agents’ memory length, because agents are equally distributed across all trading horizons. For the uniform case there is no opportunity for any prediction. On the other hand, the value of the Hurst exponent gives a signal for a possibility of the price prediction in the normal case.
Downloadable: 2007-1_4 Vacha, Vosvrda.pdf


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