# American Institute of Mathematical Sciences

April  2009, 5(2): 239-252. doi: 10.3934/jimo.2009.5.239

## Estimation in polytomous logistic model: Comparison of methods

 1 Departamento Acadêmico de Matemática, UTFPR - Universidade Tecnológica Federal do Paraná, Rua Sete de Setembro, 3165, 80230-901 Curitiba Paraná, Brazil 2 Departamento de Estatística, UFPR - Universidade Federal do Paraná, Centro Politécnico Jardim das Américas Caixa Postal 19081, 81531-980 Curitiba Paraná, Brazil

Received  April 2007 Revised  February 2009 Published  April 2009

The logistic regression model is a powerful method for modeling the relationship between a categorical variable and a set of explanatory variables. In practice, however, the existence of maximum likelihood estimates is known to be dependent on the data configuration. In fact, the Maximum Likelihood Estimators (MLE) of unknown parameters exists if, and only if, there is data overlapping. The Hidden Logistic Regression (HLR) is an alternative model under which the observed response is related to the unobservable response. The Maximum Estimated Likelihood (MEL) method is also proposed, once it is immune to the complete or quasi-complete separation of data. The Principal Component Logistic Regression (PCLR) model is useful to reduce the number of dimensions of a logistic regression model with continuous covariates avoiding multicollinearity. In this paper we present an extension of the HLR and PCLR models as means for the solution of problems with polytomous responses. The main purpose is to compare the classificatory performance obtained by the models mentioned above with those of the Classical Logistic Regression (CLR) and Individualized Logistic regression (ILR) models, in the case of polytomous responses. The purpose is to propose an alternative approach for the parameter estimation problem in polytomous logistic models when the data groups are completely separated. Simulations results resulting from databases taken from the literature show that the proposed approach is feasible.
Citation: Inácio Andruski-Guimarães, Anselmo Chaves-Neto. Estimation in polytomous logistic model: Comparison of methods. Journal of Industrial and Management Optimization, 2009, 5 (2) : 239-252. doi: 10.3934/jimo.2009.5.239
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