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ERIC Number: ED505564
Record Type: Non-Journal
Publication Date: 2009-Feb
Pages: 38
Abstractor: As Provided
Reference Count: 33
ISBN: N/A
ISSN: N/A
Efficient Full Information Maximum Likelihood Estimation for Multidimensional IRT Models. Research Report. ETS RR-09-03
Rijmen, Frank
Educational Testing Service
Maximum marginal likelihood estimation of multidimensional item response theory (IRT) models has been hampered by the calculation of the multidimensional integral over the ability distribution. However, the researcher often has a specific hypothesis about the conditional (in)dependence relations among the latent variables. Exploiting these relations may result in more efficient estimation algorithms. A well-known example is the bi-factor model, in which each item measures a general dimension and one of K other dimensions, for which Gibbons and Hedeker (1992) showed that full information maximum likelihood estimation only requires the integration over two-dimensional integrals. In this paper, it is shown how the approach of Gibbons and Hedeker (1992) can be placed into a graphical model framework. The advantage of the graphical model framework is that efficient estimation schemes can be derived in a fully automatic way by applying algorithms to the graphical representation of a statistical model. This renders the approach fairly generally applicable, and tedious derivations by hand are no longer involved. The generality of the approach is demonstrated by applying it to a multidimensional IRT model with a second order dimension. It turns out that full information maximum likelihood estimation for such a model also requires the evaluation of two-dimensional integrals only. Two appendices are included: (1) Identification Restrictions for the Bi-factor and the Testlet Model; and (2) Computations for the Bi-Factor Model. (Contains 6 figures.)
Educational Testing Service. Rosedale Road Mailstop 19R, Princeton, NJ 08541-0001. Tel: 609-921-9000; Fax: 609-734-5410; Web site: http://www.ets.org
Publication Type: Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: Educational Testing Service