Radial DEA models without inputs or without outputs

A study was conducted to analyze radial data envelopment analysis (DEA) models without inputs (or without outputs)(CCR) and CCR models with a single constant input (or with a single constant output). It was noted that CCR models without inputs or outputs are meaningless because they do not have the capacity to distinguish efficient from inefficient units. On the other hand, CCR models with a single constant input or output was found to coincide with the BCC model developed by RD Banker et al for evaluating relative efficiency of similar economic production systems.