“…Specifically, in the last decades there have been a considerable amount of discussion about the characterization of financial time series using the theory of Brownian motion (Osborne,1959;Malkiel, 1990), fractional Brownian motion (Mandelbrot, 1998), nonlinearity (Brock et al, 1991), chaos and fractals (Hsieh, 1991;Lorenz, 1993;Peters, 1996), scaling behaviour Stanley, 1995 and, and self organized criticality (Bak and Chen, 1991;Shlesinger et al, 1993). The problem of characterizing financial time series is still an open question.…”