ADF Tests in Differences - Oil Price
Brent
US Refiner Acquisition Cost
WTI
Model 1
Model 2
Model 3
Model 1
Model 2
Model 3
Model 1
Model 2
Model 3
Lags ADF Stat p-Value ADF Stat p-Value ADF Stat p-Value ADF Stat p-Value ADF Stat p-Value ADF Stat p-Value ADF Stat p-Value ADF Stat p-Value ADF Stat p-Value
1 -14.724520 0.01 -14.731829 0.01 -14.723457 0.01 -11.998446 0.01 -12.001629 0.01 -11.996120 0.01 -14.374258 0.01 -14.378050 0.01 -14.370038 0.01
2 -13.038158 0.01 -13.056638 0.01 -13.053955 0.01 -12.611831 0.01 -12.624154 0.01 -12.622154 0.01 -12.605767 0.01 -12.619316 0.01 -12.617217 0.01
3 -10.817767 0.01 -10.838558 0.01 -10.835940 0.01 -10.779205 0.01 -10.793586 0.01 -10.790733 0.01 -11.045523 0.01 -11.061214 0.01 -11.057783 0.01
4 -9.956939 0.01 -9.984678 0.01 -9.983579 0.01 -9.670070 0.01 -9.688802 0.01 -9.687410 0.01 -9.913569 0.01 -9.933388 0.01 -9.930582 0.01
5 -8.375337 0.01 -8.403633 0.01 -8.403921 0.01 -8.583741 0.01 -8.602619 0.01 -8.600144 0.01 -8.534665 0.01 -8.554679 0.01 -8.552027 0.01
6 -8.013280 0.01 -8.045406 0.01 -8.045317 0.01 -8.090294 0.01 -8.114524 0.01 -8.114112 0.01 -8.009611 0.01 -8.033413 0.01 -8.031578 0.01
7 -7.113956 0.01 -7.151100 0.01 -7.155531 0.01 -7.397052 0.01 -7.428322 0.01 -7.432690 0.01 -7.319135 0.01 -7.350809 0.01 -7.354281 0.01
8 -6.783359 0.01 -6.829909 0.01 -6.838016 0.01 -7.142487 0.01 -7.181795 0.01 -7.188417 0.01 -6.998140 0.01 -7.037955 0.01 -7.044344 0.01
9 -6.639609 0.01 -6.690423 0.01 -6.696587 0.01 -6.596103 0.01 -6.634675 0.01 -6.639971 0.01 -6.676636 0.01 -6.720024 0.01 -6.725781 0.01
10 -5.847006 0.01 -5.892893 0.01 -5.899093 0.01 -5.883546 0.01 -5.921228 0.01 -5.928081 0.01 -6.038508 0.01 -6.081142 0.01 -6.087604 0.01
11 -5.605221 0.01 -5.663350 0.01 -5.675074 0.01 -5.536356 0.01 -5.580107 0.01 -5.590077 0.01 -5.784505 0.01 -5.836828 0.01 -5.847315 0.01
12 -5.310199 0.01 -5.363847 0.01 -5.372712 0.01 -5.589718 0.01 -5.634069 0.01 -5.640219 0.01 -5.643980 0.01 -5.695144 0.01 -5.702519 0.01
Model 1: No drift or trend
Model 2: With drift, no trend
Model 3: With drift and trend