RT journal article T1 Integer interval DEA: An axiomatic derivation of the technology and an additive, slacks-based model A1 Arana Jiménez, Manuel A1 Sánchez Gil, María del Carmen A1 Younesi, Atefeh A1 Lozano, Sebastián A2 Estadística e Investigación Operativa K1 Efficiency K1 DEA K1 Integer interval data K1 Production possibility set K1 Slacks-based model AB The present paper studies the efficiency assessment of Decision-Making Units (DMUs) when their inputs and outputs are de- scribed under uncertainty of the type of integer interval data. An axiomatic derivation of the production possibility set (PPS) is presented. An additive, slacks-based data envelopment analysis (DEA) model is formulated, consisting of two phases. This has required the use of adequate arithmetic and LU-partial orders for integer intervals. This novel integer interval DEA approach is the first step towards DEA models under fuzzy integer intervals, with the extension of the corresponding arithmetic and LU-partial or- ders to fuzzy integer intervals. The proposed method is applied on a dataset, taken from the literature, that involves both continuous and integer interval variables. PB Elsevier SN 0165-0114 YR 2021 FD 2021 LK http://hdl.handle.net/10498/25367 UL http://hdl.handle.net/10498/25367 LA eng NO The first and second authors are partially supported by grant PID2019-105824GB-I00. The fourth author acknowledges the financial support of the Spanish Ministry of Science, Innovation and Universities, grant PGC2018-095786-B-I00. DS Repositorio Institucional de la Universidad de Cádiz RD 11-nov-2026