Odhad Hurstova exponentu v časových řadách denních výnosů akciových indexů

Estimation of the Hurst Exponent in Time Series of Daily Returns of Stock Indices

Pavel Srbek

Politická ekonomie, 2018, vol. 2018, issue 4, 508-524

Abstract: One of the fundamental assumptions of the efficient market hypothesis and the modern portfolio theory are both Gaussian probability distribution and the independence of returns. This paper provides a brief historical review of efforts dealing with capital markets emphasizing their efficiency and counter-tendencies whose goal was to falsify the assumption of independence of returns and their normal distribution. This paper applies a measure of long-range dependence rediscovered and promoted by Mandelbrot to daily returns of 27 selected stock indices. This measure is called Hurst exponent and was estimated using rescaled range analysis. The results are in line with similar papers stating that the series of daily returns are prevailingly persistent which implies the presence of local trends. Such a finding falsifies the assumption of random walk in stock prices.

Keywords: Hurst exponent; rescaled range analysis; stock indices; long-range dependence; random walk; randomness (search for similar items in EconPapers)
JEL-codes: C13 C18 G14 G17 (search for similar items in EconPapers)
Date: 2018
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DOI: 10.18267/j.polek.1207

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