Relationship between the accuracy of classifier error estimation and complexity of decision boundary
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Error estimation is a crucial part of classification methodology and it becomes problematic with small samples. We demonstrate here that the complexity of the decision boundary plays a key role on the performance of error estimation methods. First, a model is developed which quantifies the complexity of a classification problem purely in terms of the geometry of the decision boundary, without relying on the Bayes error. Then, this model is used in a simulation study to analyze the bias and root-mean-square (RMS) error of a few widely used error estimation methods relative to the complexity of the decision boundary: resubstitution, leave-one-out, 10-fold cross-validation with repetition, 0.632 bootstrap, and bolstered resubstitution, in two- and three-dimensional spaces. Each estimator is implemented with three classification rules: quadratic discriminant analysis (QDA), 3-nearest-neighbor (3NN) and two-layer neural network (NNet). The results show that all the estimation methods lose accuracy as complexity increases. 2012 Elsevier Ltd.
author list (cited authors)
Atashpaz-Gargari, E., Sima, C., Braga-Neto, U. M., & Dougherty, E. R.
complete list of authors
Atashpaz-Gargari, Esmaeil||Sima, Chao||Braga-Neto, Ulisses M||Dougherty, Edward R