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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Q2—applicability domain threshold dependence for CB1 and CB2 k-nearest neighbor (kNN) models. Each point on the curves represents a Q2 calculated for external predictions for a cumulative fraction of molecular structures in the training dataset within a step of 5%.