Table 18. Pearson correlation coefficient matrix of the regressors.

	$X_1$	$X_2$	$X_3$	$X_4$	$X_5$	$X_6$
$X_1$	1.000	0.018	0.061	0.010	0.035	−0.041
$X_2$	0.018	1.000	0.026	0.050	0.054	−0.049
$X_3$	0.061	0.026	1.000	−0.603	−0.591	−0.806
$X_4$	0.010	0.050	−0.603	1.000	0.444	0.449
$X_5$	0.035	0.054	−0.591	0.444	1.000	0.413
$X_6$	−0.041	−0.049	−0.806	0.449	0.413	1.000