Variables

Augmented Dickey-Fuller

Phillips-Perron

Origin

First Difference

Origin

First difference

Opium

−2.255

−17.806*

−1.698

−18.886*

Tea

−1.34

−9.664*

−1.29

−9.749*

Silk

−1.686

−11.274*

−1.349

−12.126*

Silver Inflow

−4.471*

−15.34*

−4.452

−15.938*

Silver-Copper Ratio

−1.636

−7.254*

−2.092

−7.325*

Rice Price

−2.345

−10.825*

−2.135

−1.127*