Table 8: Maximum likelihood estimates of the common stochastic production in the technical inefficiency model.

Variable Name	Parameter	Coefficient	Standard Error	Z	P>|z|
Constant	δ0	-8.47	5.91	-1.43	0.15
Farmer’s age (Z1)	δ1	0.161	0.1005	1.60	0.10
Farmer’s experience (Z2)	δ2	-0.117	0.082	-1.41	0.16
Education dummy (Z3)	δ3	1.453	1.797	0.81	0.42
Variable Parameters
Sigma-square	σ2	0.98	0.11	9.26**
Gamma	γ	0.37	0.10	3.80**
Log likelihood		-176.92
Mean of exp (−Ui)		0.78