Table 5.

Pearson correlation among input variables (N = 108).

	Land	Labour	Material	Energy	Capital	Contract
Land	1.000	0.936	0.864	0.943	0.885	0.861
Labour	0.936	1.000	0.832	0.936	0.804	0.720
Material	0.864	0.832	1.000	0.935	0.931	0.858
Energy	0.943	0.936	0.935	1.000	0.935	0.825
Capital	0.885	0.804	0.931	0.935	1.000	0.920
Contract	0.861	0.720	0.858	0.825	0.920	1.000

Note: all correlation coefficients are statistically significant at α = 0.01.