Table AI. Stochastic frontier estimation... | Emerald Publishing

Table AI.

Stochastic frontier estimation

Variable	Coef.	t-stat
Constant	7.847^***	140.51
NACE 220	−0.102^***	−2.59
NACE 1011	−0.571^***	−9.36
NACE 1013	−0.497^***	−8.33
NACE 1051	−0.463^***	−8.98
NACE 1089	−1.097^***	−16.53
NACE 1102	−0.530^***	−5.67
NACE 1103	−0.084	−1.32
NACE 1610	−0.298^***	−5.90
NACE 4120	−0.279^***	−4.20
NACE 4622	−0.542^***	−7.86
NACE 4631	−0.658^***	−12.94
NACE 4632	−0.643^***	−10.60
NACE 4639	−0.376^***	−4.71
NACE 4673	−0.149^***	−2.87
NACE 4722	−0.803^***	−16.53
Labor	0.306^***	33.93
Capital	0.038^***	4.26
Materials	0.696^***	106.56
1/2 Labor²	0.123^***	2.79
Labor × Capital	0.034^*	1.95
Labor × Materials	−0.075^***	−3.60
1/2 Capital²	0.064^***	5.11
Capital × Materials	−0.099^***	−5.93
1/2 Materials²	0.115^***	14.01
Central	−0.048^**	−2.06
Coast	−0.075^***	−15.91
Electronic commerce	0.142^***	8.72
Organic	0.063^***	3.22
Quality certification	0.761^***	8.97
D₂₀₀₇	−0.044^***	−6.38
D₂₀₀₈	−0.010	−1.06
D₂₀₀₉	−0.012	−0.99
Subsidy	0.194^***	3.70

Log likelihood	225.947

Variable	Coef.	t-stat
Constant	7.847^***	140.51
NACE 220	−0.102^***	−2.59
NACE 1011	−0.571^***	−9.36
NACE 1013	−0.497^***	−8.33
NACE 1051	−0.463^***	−8.98
NACE 1089	−1.097^***	−16.53
NACE 1102	−0.530^***	−5.67
NACE 1103	−0.084	−1.32
NACE 1610	−0.298^***	−5.90
NACE 4120	−0.279^***	−4.20
NACE 4622	−0.542^***	−7.86
NACE 4631	−0.658^***	−12.94
NACE 4632	−0.643^***	−10.60
NACE 4639	−0.376^***	−4.71
NACE 4673	−0.149^***	−2.87
NACE 4722	−0.803^***	−16.53
Labor	0.306^***	33.93
Capital	0.038^***	4.26
Materials	0.696^***	106.56
1/2 Labor²	0.123^***	2.79
Labor × Capital	0.034^*	1.95
Labor × Materials	−0.075^***	−3.60
1/2 Capital²	0.064^***	5.11
Capital × Materials	−0.099^***	−5.93
1/2 Materials²	0.115^***	14.01
Central	−0.048^**	−2.06
Coast	−0.075^***	−15.91
Electronic commerce	0.142^***	8.72
Organic	0.063^***	3.22
Quality certification	0.761^***	8.97
D₂₀₀₇	−0.044^***	−6.38
D₂₀₀₈	−0.010	−1.06
D₂₀₀₉	−0.012	−0.99
Subsidy	0.194^***	3.70

Log likelihood	225.947

Notes:

*

Significant at 10%,

**

significant at 5%,

***

significant at 1%

Source: Own elaboration