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Statistics seminar: "A general framework for a mixture model of ordinal data"

Seminario di Statistica

22/04/2013 dalle 15:00 alle 16:30

Dove Dipartimento di Scienze Statistiche - Via Belle Arti 41 - Aula IV

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Relatore

Maria Iannario, University of Naples Federico II

 

Abstract

This talk gives a general overview of the specification and estimation of an alternative class of statistical models introduced for the analysis of ordinal variables.
On the basis of experimental data and statistical motivations, the response distribution is modelled as the convex Combination of a discrete Uniform and a shifted Binomial random variable (denoted as CUB models) whose parameters may be consistently estimated and validated by maximum likelihood inference. In addition, subjects' covariates may be explicitly considered in order to assess how the respondents’ characteristics affect the ordinal score.
We review some basic concepts and present new extensions concerning shelter effect, overdispersion analysis, multilevel structure and design-based inference.
In addition, we provides empirical evidence of the approach by modelling happiness and job satisfaction on the basis of data collected in the Survey on Household Income and Wealth (SHIW) conducted by the Bank of Italy.
Further considerations about future researches will conclude the presentation.