@article {simidat231, title = {Analysis of preprocessing vs. cost-sensitive learning for imbalanced classification. Open problems on intrinsic data characteristics}, journal = {Expert Systems with Applications}, volume = {39}, number = {7}, year = {2012}, pages = {6585-6608}, doi = {10.1016/j.eswa.2011.12.043}, author = {V. L{\'o}pez and A. Fern{\'a}ndez and J.G. Moreno-Torres and F. Herrera} }