Combinatorial Efficiency Evaluation: The Knapsack Problem in Data Envelopment Analysis

Table 2

Different combinations of DMUs.

Combination set	CDMUs
𝑃	{1},{2},{3},{4},{1,2},{1,3},{1,4},{2,3},{2,4},{3,4},{1,2,3},{1,2,4},{1,3,4},{2,3,4},{1,2,3,4}
𝑅	{1},{2},{3},{4},{1,2},{1,3},{1,4},{2,3},{2,4},{3,4}
𝐷	{1,2},{1,3},{1,4},{2,3},{2,4},{3,4}
Model (10)	{1,1},{2,2},{3,3},{4,4},{1,2},{1,3},{1,4},{2,3},{2,4},{3,4}