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Muraki, Eiji	1
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Stevenson, Jose	1

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A Comparison of ASCAL and LOGIST Parameter Estimation Programs.

Skaggs, Gary; Stevenson, Jose – 1986

This study assesses the accuracy of ASCAL, a microcomputer-based program for estimating item parameters for the three-parameter logistic model in item response theory. Item responses are generated from a three-parameter model, and item parameter estimates from ASCAL are compared to the generating item parameters and to estimates produced by…

Descriptors: Algorithms, Comparative Analysis, Computer Software, Estimation (Mathematics)

Marginal Maximum Likelihood Estimation for Three-Parameter Polychotomous Item Response Models: Application of an EM Algorithm.

Muraki, Eiji – 1984

This study examines the application of the marginal maximum likelihood (MML) EM algorithm to the parameter estimation problem of the three-parameter normal ogive and logistic polychotomous item response models. A three-parameter normal ogive model, the Graded Response model, has been developed on the basis of Samejima's two-parameter graded…

Descriptors: Algorithms, Data Analysis, Estimation (Mathematics), Goodness of Fit