Table 1 Descriptive statistics

Mean

0.00001

0.00001

0.00000

− 0.00002

0.00000

0.00002

Maximum

0.05600

0.10600

0.12000

0.18800

0.12300

0.31400

Minimum

− 0.08200

− 0.08300

− 0.14800

− 0.08600

− 0.11300

− 0.31500

Std. Dev

0.00663

0.00723

0.00868

0.00773

0.00862

0.01067

Skewness

− 0.13686

0.04133

0.10145

0.76115

0.04843

0.75986

Kurtosis

12.22892

15.49612

21.22038

25.46886

14.54152

81.53078

Jarque–Bera

100,934*

184,893*

393,116*

600,486*

157,728*

7,304,562*

ADF

− 220.4327*

− 127.2089*

− 130.6018*

− 137.5965*

− 135.6117*

− 135.6117*

PP

− 315.2593*

− 292.4937*

− 298.2076*

− 290.0422*

− 304.6763*

− 304.6763*

KPSS

0.3022

0.1721

0.2496

0.2293

0.2344

0.2344