Figure 4.

Comparison of F_q(n) calculation times (sum of DFA₁ and DFA₂) for series of length N. Times for analyzing {wb_i} (square) and binomial cascade (circle) series (see text) by traditional (solid symbols) and fast MF DFA algorithm (open symbols): average of 10 runs on a personal computer with Intel i7-7600U CPU at 2.80 GHz, 16 GB RAM and Samsung MZVLW1T0HMLH-000L7 hard disk. As the series length, N, increases, the number of block sizes, n, also increases remaining constant the block-size density of four n values per decade. The calculation time of the traditional algorithm for maximum overlapping and N = 10⁶ has been extrapolated (cross symbol).