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ArtikelEmpirical Histograms in Item Response Theory With Ordinal Data  
Oleh: Woods, Carol M.
Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Educational and Psychological Measurement vol. 67 no. 01 (Feb. 2007), page 73-87.
Topik: item response theory; IRT; nonnormality; empirical histogram; expectation Maximation; EM; marginal maximum likelihood; MML
Fulltext: 73.pdf (126.19KB)
Isi artikelThe purpose of this research is to describe, test, and illustrate a new implementation of the empirical histogram (EH) method for ordinal items. The EH method involves the estimation of item response model parameters simultaneously with the approximation of the distribution of the random latent variable (?) as a histogram. Software for the EH method with ordinal items (having more than two response options) has not been readily available in the past but was created for the present research. Simulation results suggest that with larger (but not smaller) numbers of quadrature points, graded-model item parameter estimates from the EH method are highly accurate when the ? distribution is either normal or skewed. Results for expected a posteriori scores depend on the magnitude of ?.
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