Combinatorial Efficiency Evaluation: The Knapsack Problem in Data Envelopment Analysis

Table 3

Combinatorial efficiency evaluation by models (8) and (10).

CDMUs	Input	Output 1	Output 2	Combinatorial efficiency
				Model (8)	Model (10)
{1,2}	2	4	9	1	1
{1,3}	2	6	7	0.9583	0.9285
{1,4}	2	5	6	0.8125	0.7857
{2,3}	2	8	6	1	1
{2,4}	2	7	5	0.8667	0.8571
{3,4}	2	9	3	1	0.9000