Table 6. Performance across variation in fixed inputs.

Inputs	Method	MAD	NOTFront	PU20%	PO20%	rs
No fixed inputs	DEA	0.068	11.8%	0.0%	42.6%	0.863
	rDEA	0.025	2.7%	1.5%	7.2%	0.955
	rSDF-CD	0.106	0.0%	50.2%	10.5%	0.762
	ENS	0.055	0.0%	25.8%	6.3%	0.936
With fixed inputs	DEA	0.075	8.9%	2.7%	41.5%	0.887
	rDEA	0.047	2.2%	18.9%	8.9%	0.930
	rSDF-CD	0.099	0.0%	48.0%	9.7%	0.774
	ENS	0.061	0.0%	32.7%	4.8%	0.928

Note: Numbers in bold highlight the best outcome for each performance indicator across the alternative approaches. MAD: median absolute deviation, NOTFront: percentage of misclassified DMUs, PU_20%: percentage of underestimation, PO_20%: percentage of overestimation, r_s: Spearman’s rank correlation.