Abstract (EN):
The most popular weight restrictions are assurance regions (ARs), which impose ratios between weights
to be within certain ranges. ARs can be categorized into two types: ARs type I (ARI) and ARs type II (ARII).
ARI specify bounds on ratios between input weights or between output weights, whilst ARII specify
bounds on ratios that link input to output weights. DEA models with ARI successfully maximize relative
efficiency, but in the presence of ARII the DEA models may under-estimate relative efficiency or may
become infeasible. In this paper we discuss the problems that can occur in the presence of ARII and propose
a new nonlinear model that overcomes the limitations discussed. Also, the dual model is described,
which enables the assessment of relative efficiency when trade-offs between inputs and outputs are
specified. The application of the model developed is illustrated in the efficiency assessment of Portuguese
secondary schools.
Language:
English
Type (Professor's evaluation):
Scientific
No. of pages:
10