A COMPARISON BETWEEN MAXIMUM LIKELIHOOD RULE AND LOGISTIC DISCRIMINANT ANALYSIS IN THE CLASSIFICATION OF MIXTURE OF DISCRETE AND CONTINOUS VARIABLES

An optimal measure of performance is the one that lead to maximization of average error rate or probability of misclassification. This paper aimed to compare between the maximum likelihood rule and logistic discriminant analysis in the classification of mixture of discrete and continuous variables. The efficiency of the methods was tested using simulated and real dataset. The result obtained showed that the maximum likelihood rule performed better than the logistic discriminant analyses, in maximizing the average error rate in both experiment conducted. Keyword: Maximum likelihood rule, Logistic discriminants, error rate, Likelihood ratio, Discriminant analysis

Sufficient reductions in regression with mixed predictors

Most data sets comprise of measurements on continuous and categorical variables. Yet,modeling high-dimensional mixed predictors has received limited attention in the regressionand classication statistical literature. We study the general regression problem of inferringon a variable of interest based on high dimensional mixed continuous and binary predictors.The aim is to nd a lower dimensional function of the mixed predictor vector that containsall the modeling information in the mixed predictors for the response, which can be eithercontinuous or categorical. The approach we propose identies sucient reductions byreversing the regression and modeling the mixed predictors conditional on the response.We derive the maximum likelihood estimator of the sucient reductions, asymptotic testsfor dimension, and a regularized estimator, which simultaneously achieves variable (feature)selection and dimension reduction (feature extraction). We study the performance of theproposed method and compare it with other approaches through simulations and real dataexamples.Fil: Bura, Efstathia. Technische Universitat Wien; AustriaFil: Forzani, Liliana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química; ArgentinaFil: García Arancibia, Rodrigo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral. Facultad de Ciencias Económicas. Instituto de Economía Aplicada Litoral; ArgentinaFil: Llop Orzan, Pamela Nerina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química; ArgentinaFil: Tomassi, Diego Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química; Argentin

Dynamic Decomposition of Spatiotemporal Neural Signals

Neural signals are characterized by rich temporal and spatiotemporal dynamics that reflect the organization of cortical networks. Theoretical research has shown how neural networks can operate at different dynamic ranges that correspond to specific types of information processing. Here we present a data analysis framework that uses a linearized model of these dynamic states in order to decompose the measured neural signal into a series of components that capture both rhythmic and non-rhythmic neural activity. The method is based on stochastic differential equations and Gaussian process regression. Through computer simulations and analysis of magnetoencephalographic data, we demonstrate the efficacy of the method in identifying meaningful modulations of oscillatory signals corrupted by structured temporal and spatiotemporal noise. These results suggest that the method is particularly suitable for the analysis and interpretation of complex temporal and spatiotemporal neural signals