Table 2.

Estimation of cost functions.

Ln cost of output	Coefficient	Standard error	Z	P value > z
Ln of output	0.47646531∗∗∗	0.1013794	4.70	0.000
Ln cost of seed	0.32506669∗∗	0.1603711	2.03	0.043
Ln cost of land	0.34094717∗∗	0.1341895	−2.54	0.011
Ln cost of labor	0.02229082	0.0804879	−0.28	0.782
Constant	8.3712285∗∗∗	0.8062753	10.38	0.000
/lnsig2v	−1.413302	0.1241996
/lnsig2u	−7.619796	67.22597
sigma_v	0.4932936	0.0306334
sigma_u	0.0221504	0.7445425
sigma2	0.2438292	0.0348104
Lambda	0.0449032	0.757197

^∗ , ^∗∗, and ^∗∗∗ refers to10%, 5%, and 1% significance levels, respectively. Source: stochastic cost frontier model result.