Neural and Wavelet Network Models for Financial Distress Classification

Authors:
Victor M. Becerra;Roberto K. Galvão;Magda Abou-Seada
Affiliations:
Department of Cybernetics, University of Reading, Reading, United Kingdom RG6 6AY;Instituto Tecnológico de Aeronáutica, Div. Engenharia Eletrônica, São José dos Campos--SP, Brazil 12228-900;Business School, Middlesex University, London, United Kingdom NW4 4BT
Venue:
Data Mining and Knowledge Discovery
Year:
2005

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Abstract

This work analyzes the use of linear discriminant models, multi-layer perceptron neural networks and wavelet networks for corporate financial distress prediction. Although simple and easy to interpret, linear models require statistical assumptions that may be unrealistic. Neural networks are able to discriminate patterns that are not linearly separable, but the large number of parameters involved in a neural model often causes generalization problems. Wavelet networks are classification models that implement nonlinear discriminant surfaces as the superposition of dilated and translated versions of a single "mother wavelet" function. In this paper, an algorithm is proposed to select dilation and translation parameters that yield a wavelet network classifier with good parsimony characteristics. The models are compared in a case study involving failed and continuing British firms in the period 1997--2000. Problems associated with over-parameterized neural networks are illustrated and the Optimal Brain Damage pruning technique is employed to obtain a parsimonious neural model. The results, supported by a re-sampling study, show that both neural and wavelet networks may be a valid alternative to classical linear discriminant models.