Upgrading the Fusion of Imprecise Classifiers Moral García, Serafín Benítez, María D. Imprecise classification Credal Decision Trees Ensembles Bagging Combination technique Imprecise classification is a relatively new task within Machine Learning. The difference with standard classification is that not only is one state of the variable under study determined, a set of states that do not have enough information against them and cannot be ruled out is determined as well. For imprecise classification, a mode called an Imprecise Credal Decision Tree (ICDT) that uses imprecise probabilities and maximum of entropy as the information measure has been presented. A difficult and interesting task is to show how to combine this type of imprecise classifiers. A procedure based on the minimum level of dominance has been presented; though it represents a very strong method of combining, it has the drawback of an important risk of possible erroneous prediction. In this research, we use the second-best theory to argue that the aforementioned type of combination can be improved through a new procedure built by relaxing the constraints. The new procedure is compared with the original one in an experimental study on a large set of datasets, and shows improvement. 2023-10-04T08:23:23Z 2023-10-04T08:23:23Z 2023-07-19 journal article Moral-García, S.; Benítez, M.D.; Abellán, J. Upgrading the Fusion of Imprecise Classifiers. Entropy 2023, 25, 1088. [https:// doi.org/10.3390/e25071088] https://hdl.handle.net/10481/84822 10.3390/e25071088 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional MDPI