Index of Balanced Accuracy: A Performance Measure for Skewed Class Distributions

Authors:
V. García;R. A. Mollineda;J. S. Sánchez
Affiliations:
Lab. Reconocimiento de Patrones, Instituto Tecnológico de Toluca, Metepec, México 52140 and Dept. Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló de la Plana, ...;Dept. Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló de la Plana, Spain 12071;Dept. Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló de la Plana, Spain 12071
Venue:
IbPRIA '09 Proceedings of the 4th Iberian Conference on Pattern Recognition and Image Analysis
Year:
2009

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Abstract

This paper introduces a new metric, named Index of Balanced Accuracy , for evaluating learning processes in two-class imbalanced domains. The method combines an unbiased index of its overall accuracy and a measure about how dominant is the class with the highest individual accuracy rate. Some theoretical examples are conducted to illustrate the benefits of the new metric over other well-known performance measures. Finally, a number of experiments demonstrate the consistency and validity of the evaluation method here proposed.