Technical Efficiency of Ginger Production in Ilam District of Nepal: A Stochastic Production Frontier Approach

Table 2

Maximum likelihood estimates of stochastic frontier production function for ginger farming.

Variables	Coefficient	Standard error	z	value
Constant term	3.423	0.212	16.08	≤0.001
Seed	0.864	0.532	16.25	≤0.001
Farmyard manure	0.953	0.416	2.29	0.022
Chemical fertilizers	−0.006	0.164	−0.41	0.685
Human labour	−0.644	0.846	−7.61	≤0.001
Bullock labour	−0.083	0.522	−1.61	0.108
Variance parameters
Sigma	0.105	0.039
Sigma	0.435	0.054
Sigma^2	0.200	0.042
Lambda	4.142	0.086
Gamma	0.805
Observations = 100
Wald Chi^2 (5) = 423.58
Prob > Chi^2 = 0.000
Log likelihood = −9.293

, , and indicate statistical significance at 1%, 5%, and 10% probability level, respectively.