Parameter

Estimate

Std. Error

t-value

p-value

${\varpi }_0\left(\text{constants}\right)$

5.969

10.827

0.551

0.581

${\varpi }_1\left(\text{exch}\right)$

0.5957

0.613

0.971

0.019

${\varpi }_2\left(\text{oil}\right)$

−0.098

0.0325

−3.043

0.002

${\varpi }_3\left(\text{To}\right)$

17.480

12.907

1.354

0.005