Seminari SEA: Likelihood-Based Finite Mixture Models for Ordinal Data

SEA

Inscripció al seminari gratuïta: enllaç

Likelihood-Based Finite Mixture Models for Ordinal Data

 

Conferenciant

Daniel Fernández Martínez, Ph.D

Researcher
Unitat de Recerca, Docència i Innovació
Parc Sanitari Sant Joan de Déu

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Dia i hora:

Dijous 27 de febrer de 2020 a les 12:00.

Lloc:

Auditori del Centre de Recerca Matemàtica, Facultat de Ciències, campus de la UAB. (enllaç)

Durada:

1 hora aproximadament

Inscripció:

L'assistència a aquest seminari és gratuïta.
Per motius d'aforament us agrairem que us enregistreu en el següent formulari: enllaç

Abstract:

Many of the methods which deal with the reduction of dimensionality in matrices of data are based on mathematical techniques such as distance-based algorithms or matrix decomposition and eigenvalues. In general, it is not possible to use statistical inferences or select the appropriateness of a model via information criteria with these techniques because there is no underlying probability model. Additionally, the use of ordinal data is very common (e.g. Likert or pain scale). Recent research has developed a set of likelihood-based finite mixture models for a data matrix of ordinal data. This approach applies fuzzy clustering via finite mixtures to the stereotype model. Fuzzy allocation of rows, columns, and rows and columns simultaneously to corresponding clusters is obtained using unsupervised learning techniques (EM algorithm) and, also by Bayesian approaches (Reversible-Jump MCMC sampler). Examples with ordinal data sets will be shown to illustrate the application of this approach.

Organitzadors:

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Grup de Recerca

Advanced Stochastic
Modelling

 

US ESPEREM

Campus d'excel·lència internacional U A B