Variable

Coefficient

Std. Error

t-Statistic

Prob.

C

−280.3828

192.5934

−1.455828

0.1467

GRADF_01^2

0.641366

0.433589

1.479201

0.1403

GRADF_02^2

0.073352

0.061296

1.196679

0.2325