Table 6.

Stage 2: Results of Stochastic Frontier Analysis (SFA) regression model.

Variables	Z1	Z2	Z3	Constant	γ	LR
Slack Variable of X1	−0.006 ***	4.191 ***	0.048 ***	−478.819 ***	0.999 ***	28.848 ***
Slack Variable of X2	−0.278 **	255.736 ***	2.670 ***	−30,690.464 ***	0.999 ***	20.944 ***

Note: “***” donates significant at significance levels of 1%; “**” donates significant at significance levels of 5%.