Estimation of Parameters in the Three-Parameter Latent Trait Model
Final technical rept. 1 Feb 1978-30 Apr 1979
MASSACHUSETTS UNIV AMHERST LAB OF PSYCHOMETRIC AND EVALUATIVE RESEARCH
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Two methods for estimation of parameters of the three-parameter logistic model, the Urry method and the maximum likelihood procedure, were studied with respect to several issues using artificial data. Comparisons were made as to the accuracy of estimation and its relationship to the number of items and examinees, the effect of the distributions of ability on the resulting estimates of items and ability parameters, and the statistical properties such as bias and consistency of the resulting estimates.
- Statistics and Probability