We propose an extension to the basic DEA models that guarantees that if an intensity is positive then it must be at least as large as a pre-defined lower bound. This requirement adds an integer programming constraint known within Operations Research as a Fixed-Charge (FC) type of constraint....

Data Envelopment Analysis (DEA) evaluates the efficiency of Decision Making Units without imposing a priori weights on the input and output dimensions involved. This Note extends DEA to situations where ordinal relations among weights corresponding to certain dimensions exist. The extended model...