Estimating long-range dependence in time series: an evaluation of estimators implemented in R.
Recent studies have shown that many physiological and behavioral processes can be characterized by long-range correlations. The Hurst exponent H of fractal analysis and the fractional-differencing parameter d of the ARFIMA methodology are useful for capturing serial correlations. In this study, we report on different estimators of H and d implemented in R, a popular and freely available software package. By means of Monte Carlo simulations, we analyzed the performance of (1) the Geweke-Porter-Hudak estimator, (2) the approximate maximum likelihood algorithm, (3) the smoothed periodogram approach, (4) the Whittle estimator, (5) rescaled range analysis, (6) a modified periodogram, (7) Higuchi's method, and (8) detrended fluctuation analysis. The findings-confined to ARFIMA (0, d, 0) models and fractional Gaussian noise-identify the best estimators for persistent and antipersistent series. Two examples combining these results with the step-by-step procedure proposed by Delignières et al. (2006) demonstrate how this evaluation can be used as a guideline in a typical research situation.
Stroe-Kunold
Esther
E
Department of Psychology, University of Heidelberg, Heidelberg, Germany.
Stadnytska
Tetiana
T
Werner
Joachim
J
Braun
Simone
S
D035841:Behavioral Research / Q000379:methods*; D003198:Computer Simulation / Q000706:statistics & numerical data*; D017709:Fractals; D006801:Humans; D009010:Monte Carlo Method; D012984:Software; D013997:Time Factors