An obvious measure of efficiency or productivity is the ratio of output to input. When there are multiple outputs and/or inputs one approach is to take weighted combinations before calculating the ratio. How should these weights be chosen? In comparing the efficiency of organizational units data...

Consider a set of decision-making units (DMUs, e.g. branches, departments, firms) which employ a variety of resources to produce multiple outputs. The units being compared may be in the public sector e.g. health or education, so that the outputs and inputs need not be measured in monetary terms....