Since the competition of Thai banking industry has been increasing,
efficiency of Thai banks become a crucial issue to study. Evaluating their
efficiency will bring useful information for managers, investors, depositors and
owners in decisions making. The efficiency of a bank is defined bases on the
relation between inputs and outputs of that bank, which encouraging banks to
maximizing their outputs and/or minimizing their inputs. Because of high
competition in the market, there is a pressure for Thai banks to improve their
efficiency.