Core Concepts
The super-efficiency model in Data Envelopment Analysis (DEA) can be used to identify input and output weights that maximize the difference in efficiency scores between the most efficient Decision Making Unit (DMU) and the others, effectively highlighting the strengths of the top performer.
Stats
The study analyzes the efficiency of 21 Japanese banks (4 city banks, 14 regional banks, and 3 others) in 2016.
The input variables are interest expenses and non-interest expenses.
The output variables are interest income and non-interest income.
The super-efficiency model identified the Bank of Yokohama as the sole efficient bank, with all other banks having efficiency scores below 0.720.
The second-best performing banks were Hokuyo Bank and Resona Bank.