Boletim do resumo e programas (XIV EMR 2015)

XIV Escola de Modelos de Regressão
De 2 a 5 de Março de 2015 - Centro de Convenções - Unicamp
48
Comunicação Oral 7.1 ( CO7)
Modelo LSMIRT para varias populações
Gualberto S.A. Montalvo
Resumo: A multidimensional item response theory model with latent linear
structure for several groups is proposed. This model was introduced in order to fit
binary tests, which in turn are divided in several subtest and subsequently applied to
different groups or populations. It is assume that each subtest measure a onedimensional
latent trait (main latent trait or main ability). The main aim is to
measure these latent traits. Furthermore, it is also assumed that the entire test
measures a latent trait vector from tested subjects. This latent trait vector does not
necessary have the same components as the main latent trait. Instead, it is supposed
that the main latent traits are linear combinations of latent trait vector components.
Therefore, they have a linear latent structure. Each item is assumed to belong to
exactly one subtest. In this model, the test dimension is defined as the number of
subtest and it may not equal the latent trait space dimension. In order to estimate the
parameters, an augment data Gibbs sampler (DAGS) was implemented and tested in
simulations. Besides, the model was used to fit data from the ’First comparative
survey on language, math and associated factors for 3rd and 4th year students
(PERCE)’, which was carried out by the Latinamerican laboratory for assessment of
quality of education.
Palavras-Chave: Teoria da resposta ao item multidimensional, estrutura linear
latente, vários grupos, subteste, traço latente.
Data
Março
5
Auditório
1
: emrxiv@gmail.com
: http://www.ime.usp.br/~abe/emr2015