[Forum SIS] Seminario DiSIA: Lara Fontanella - Errata corrige

[Raffaele Guetto]

ERRATA CORRIGE - IL SEMINARIO SI TERRÀ IL 13 MAGGIO E NON IL 6 MAGGIO 

DiSIA (Dipartimento di Statistica, Informatica, Applicazioni "G.
Parenti")
Università di Firenze

- PROSSIMO SEMINARIO -

13 Maggio 2019 ore 12.00

LARA FONTANELLA (Università di Chieti-Pescara) terrà il seguente
seminario:  

Simple Structure Detection Through Bayesian Exploratory Multidimensional
IRT Models 

In modern validity theory, a major concern is the construct validity of
a test, which is commonly assessed through confirmatory or exploratory
factor analysis. In the framework of Bayesian exploratory
Multidimensional Item Response Theory (MIRT) models, we discuss two
methods aimed at investigating the underlying structure of a test, in
order to verify if the latent model adheres to a chosen simple factorial
structure. This purpose is achieved without imposing hard constraints on
the discrimination parameter matrix to address the rotational
indeterminacy. The first approach prescribes a 2-step procedure. The
parameter estimates are obtained through an unconstrained MCMC sampler.
The simple structure is, then, inspected with a post-processing step
based on the Consensus Simple Target Rotation technique. In the second
approach, both rotational invariance and simple structure retrieval are
addressed within the MCMC sampling scheme, by introducing a
sparsity-inducing prior on the discrimination parameters. Through
simulation as well as real-world studies, we demonstrate that the
proposed methods are able to correctly infer the underlying sparse
structure and to retrieve interpretable solutions. 

Referenti: Agnese Panzera e Alessandra Petrucci

Il seminario sarà tenuto presso l'aula 32 del DiSIA, Viale Morgagni 59,
50134 Firenze.

Tutti gli interessati sono cordialmente invitati a partecipare. 
-- 
RAFFAELE GUETTO
_University of Florence - Department of Statistics, Computer Science,
Applications_
Viale Morgagni, 59 - 50134 Firenze
Tel: +39 055 2751553
Web:
https://www.disia.unifi.it/p-doc2-2017-000000-G-3f2c342938302c-0.html
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