As can be seen from the variance de

As can be seen from the variance decomposition results, about 98.70% of d-WTI changes in the second phase are caused by its own changes, while about 1.29% are caused by the influence of D-VI. From phase 3 onwards, about 95.4% were due to its own influence, while only 4.6% were due to d-VI changes. Among the changes of D-VI, 74.6% of phase 2 was due to its own influence, and about 25.4% was affected by D-WTI. Since phase 3, nearly 70% of the total was due to its own changes, and 30% was due to d-WTI changes. This shows that the WTI crude oil price has more explanatory power to 0# diesel oil price than 0# diesel oil price to WTI crude oil price