Variable

Coefficient

Std. Error

t-Statistic

Prob.

C

1.278358

0.181719

7.034807

0.0000

GRADF_01^2

0.211529

0.052530

4.026846

0.0001

GRADF_01*GRADF_02

−0.026595

0.005248

−5.067638

0.0000

GRADF_01*GRADF_03

−3.535113

0.275195

−12.84583

0.0000

GRADF_02^2

0.000102

1.67E-05

6.138065

0.0000

GRADF_02*GRADF_03

−0.076551

0.008084

−9.469358

0.0000

GRADF_03^2

4.049348

0.184285

21.97335

0.0000

R-squared

0.917461

Mean dependent var

2.808817

Adjusted R-squared

0.915448

S.D. dependent var

9.506696

S.E. of regression

2.764337

Akaike info criterion

4.898757

Sum squared resid

1879.823

Schwarz criterion

4.996518

Log likelihood

−612.6927

Hannan-Quinn criter.

4.938089

F-statistic

455.7371

Durbin-Watson stat

1.990603

Prob(F-statistic)

0.000000