Mine Performance Assessment by Means of Stochastic Frontier Analysis

Table 1

Data set. Descriptive statistics.

	L, 10^3 man-shift hours	O, 10^6 bank m^3	E, 10^6 kWhs	Q, 10^6 tons
Min	172.58	29.25	83.68	6.95
Max	254.63	52.83	167.74	23.34
Standard deviation	24.53	7.03	33.11	4.47
Mean	219.03	38.79	119.79	14.67