Item Response Theory With Estimation of the Latent Density Using Davidian Curves  

Oleh:

Woods, Carol M. ; Nan, Lin

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Applied Psychological Measurement vol. 33 no. 2 (Mar. 2009), page 102-117.
Topik: item response theory; marginal maximum likelihood; latent variable; density estimation; seminonparametric
Fulltext: 102.pdf (247.55KB)

Isi artikel

Davidian-curve item response theory (DC-IRT) is introduced, evaluated with simulations, and illustrated using data from the Schedule for Nonadaptive and Adaptive Personality Entitlement scale. DC-IRT is a method for fitting unidimensional IRT models with maximum marginal likelihood estimation, in which the latent density is estimated, simultaneously with the item parameters of logistic item response functions, as a Davidian curve. Simulations compare DC-IRT with Ramsay-curve IRT (RC-IRT) and the empirical histogram method (EHM) for a normal, bimodal, or skewed latent distribution. When the latent density was nonnormal, any of the three density estimation methods improved on the normal model. Both DC-IRT and RC-IRT produced more-accurate results than did the EHM.

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