Instances for the biobjective (cost-coverage) uncapacitated facility location problem:  [click here to download the test bed]

Test instances for the BO-UFLP (Bi-objective Uncapacitated Facility Location Problem) used in: Villegas, J. G., Palacios, F., and Medaglia, A. L. Solution methods for the bi-objective (cost-coverage) unconstrained facility location problem with an illustrative example. Annals of Operations Research. 147(1): 109-141, 2006. Available at: http://dx.doi.org/10.1007/s10479-006-0061-4

Instances for the truck and trailer routing problem (TTRP):[click here to download the test bed] 

Test instances for the TTRP (truck and trailer routing problem) introduced originally by I-Min Chao (2002) and used in:  Villegas, J. G., Prins, C., Prodhon, C., Medaglia, A. L., Velasco, N.  A GRASP with evolutionary path relinking for the truck and trailer routing problem. Computers & Operations Research. 38:1319-334, 2011. Available at: http://dx.doi.org/10.1016/j.cor.2010.11.011

Instances for the Single Truck and Trailer Routing Problem with Satellite Depots (STTRPSD) [click here to download the test bed]

Set of 32 instances for the Single Truck and Trailer Routing Problem with Satellite Depots (STTRPSD). These instances are described in: Villegas, J. G., Prins, C., Prodhon, C., Medaglia, A. L., and Velasco, N. GRASP/VND and multi-start evolutionary local search for the single truck and trailer routing problem with satellite depots. Engineering Applications of Artificial Intelligence. 23(5), pp. 780-794, 2010.  Available at: http://dx.doi.org/10.1016/j.engappai.2010.01.013

Instances of the Competitive location routing problem [click here to download the instances]

Derived from location routing instances by Barreto’s and Prodhon’s (available here). These instances correspond to a discrete facility location problems in a static competitive environment under the assumption of a market with fixed prices where customers behave rationally and perform routes to collect the demands they have for several competitive products. Instances introduced in Villegas, J.G and Fernandez-Gutierrez J., Competitive Location Routing Problem: a maximal covering approach, EURO 2021: XXXI  European Conference on Operational Research, Athens, Greece, 11-14 July, 2021

Using nonparametric test to compare the performance of metaheuristics [click here to download the document]

This document illustrates how to use non-parametric test for the comparison of several metaheuristics. Thes example is based on pages 294-302 of: Conover, W. (1998). Practical nonparametric statistics. New York: Wiley. The data used has been taken from:   J. G. Villegas, C. Prins, C. Prodhon, A. L. Medaglia, N. Velasco: A GRASP with evolutionary path relinking for the truck and trailer routing problem. Computers & Operations Research 38(9): 1319-1334 (2011)

A Matlab tool for Data Envelopment Analysis [to download the toolbox click here]

A public free toolbox for Data Envelopment Analysis implemented in Matlab®. This  toolbox has been developed by Maria Isabel Restrepo under my supervision as part of hers  final project in  Industrial Engineering.  A  brief introduction to DEA and the details of the implementation of the toolbox  is presented in the Technical report:  M.I. Restrepo & J.G. Villegas. Análisis Envolvente de Datos: Introducción y herramienta pública para su utilización. Departamento de Ingenieria Industrial. Universidad de Antioquia. 2007. [To download the Technical report click here].

This toolbox has been used in the article: M.I. Restrepo and J.G.  Villegas. Clasificación de grupos de investigación con análisis envolvente de datos.  Revista Facultad de Ingeniería Universidad de Antioquia  42, 105-119, 2007. [see at publisher]