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Long-range correlations and nonstationarity in the Brazilian stock market | | R. L. Costa
; G. L. Vasconcelos
; | | Date: |
17 Feb 2003 | | Journal: | Physica A, Volume 329, Issues 1-2, 1 November 2003, Pages 231-248 | | Subject: | Statistical Mechanics | cond-mat.stat-mech | | Abstract: | We report an empirical study of the Ibovespa index of the Sao Paulo Stock Exchange in which we detect the existence of long-range correlations. To analyze our data we introduce a rescaled variant of the usual Detrended Fluctuation Analysis that allows us to obtain the Hurst exponent through a one-parameter fitting. We also compute a time-dependent Hurst exponent H(t) using three-year moving time windows. In particular, we find that before the launch of the Collor Plan in 1990 the curve H(t) remains, in general, well above 1/2, while afterwards it stays close to 1/2. We thus argue that the structural reforms set off by the Collor Plan has lead to a more efficient stock market in Brazil. We also suggest that the time dependence of the Ibovespa Hurst exponent could be described in terms of a multifractional Brownian motion. | | Source: | arXiv, cond-mat/0302342 | | Services: | Forum | Review | PDF | Favorites | |
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