A hybrid ACO-GRASP algorithm for clustering analysisA hybrid ACO-GRASP algorithm for clustering analysis Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-11-182011enCluster analysis is an important tool for data exploration and it has been applied in a wide variety of fields like engineering, economics, computer sciences, life and medical sciences, earth sciences and social sciences. The typical cluster analysis consists of four steps (i.e. feature selection or extraction, clustering algorithm design or selection, cluster validation and results interpretation) with feedback pathway. These steps are closely related to each other and affect the derived clusters. In this paper, a new metaheuristic algorithm is proposed for cluster analysis. This algorithm uses an Ant Colony Optimization to feature selection step and a Greedy Randomized Adaptive Search Procedure to clustering algorithm design step. The proposed algorithm has been applied with very good results to many data sets.http://creativecommons.org/licenses/by/4.0/Annals of Operations Research1881343-358 Zopounidis Konstantinos Ζοπουνιδης Κωνσταντινος Matsatsinis Nikolaos Ματσατσινης Νικολαος Michael Doumpos Δουμπος Μιχαλης Marinaki Magdalini Μαρινακη Μαγδαληνη Marinakis Ioannis Μαρινακης Ιωαννης Springer Verlag GRASP Ant colony optimization Feature selection problem Cluster analysis Stochastic optimization