N

intercept

Hurst index

C_t

R²

F

Before the opening (3 ≤ n ≤ 150)

−0.2093

0.6369

0.2090

0.9960

4496.93

After the opening (3 ≤ n ≤ 120)

−0.1965

0.6272

0.1928

0.9931

2315.35