Table 6: Granger causality relationship test.

Null Hypothesis:	Obs	F-Statistic	Prob.
R_WTIOIL does not Granger Cause R_RGI	46	2.787	0.040**
R_RGI does not Granger Cause R_WTIOIL		0.584	0.676
R_DQOIL does not Granger Cause R_RGI	48	3.507	0.012**
R_RGI does not Granger Cause R_DQOIL		0.583	0.713