Parameter

Estimate

Std. Error

t-value

p-value

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

75.306

248.069

0.304

0.765

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

−2.518

11.351

−0.222

0.827

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

−0.234

0.491

−0.476

0.640

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

−51.169

245.542

−0.208

0.838