[Forum SIS] Ca' Foscari University Seminars

[Carlo Gaetan]

Seminar Annoucement

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Speaker:
Aristidis K Nikoloulopoulos, School of Computing Sciences, University of East Anglia


Title:
Factor copula models for item response data


Date: 28/02/2018, Hour: 11:00

Place: Meeting Room A - Zeta Building
Dipartimento di Scienze Ambientali, Informatica e Statistica - DAIS
Università Ca' Foscari - Venezia
Edificio Zeta
Via Torino, 155
I-30172 Mestre (VE)
ITALY


Abstract:
Factor or conditional independence models based on copulas are proposed for multivariate discrete data such as item response.  The factor copula models have interpretations of latent maxima/minima (in comparison with latent means) and can lead to more probability in the joint upper and/or lower tail compared with factor models based on the discretized multivariate normal distribution (or multidimensional normal ogive model).  Details on maximum likelihood estimation of parameters for the factor copula model are given, as well as analysis of the behavior of the log-likelihood.  Our general methodology is illustrated with several item response data sets and it is shown that there is a substantial improvement on existing models from the criteria of log-likelihood and goodness-of-fit. This talk will be based on collaborative work with Harry Joe (U. of British Columbia).

-- Apologies for cross posting --

Carlo Gaetan
-- 

Dipartimento di Scienze Ambientali, Informatica e Statistica - DAIS
Università Ca' Foscari - Venezia
Edificio Zeta
Via Torino, 155
I-30172 Mestre (VE)
ITALY


phone: ++39  041 234 8404
        
mobile phone: ++39 366 629 7899
     
e-mail:[gaetan"at"unive"dot"it]
web:[http://www.dais.unive.it/~gaetan]


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