RAM: A Range Adjusted Measure of Inefficiency for Use with Additive Models, and Relations to Other Models and Measures in DEAWILLIAM W. COOPER, KYUNG SAM PARK and JESÚS T. PASTOR · Journal of Productivity Analysis · 1999

The Range Adjusted Measure (RAM) in DEA: A Response to the Comment by Steinmann and ZweifelWilliam W. Cooper; Kyung Sam Park; Jesus T. Pastor · 2001