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| Rost, Jurgen | 1 |
| Tsutakawa, Robert K. | 1 |
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| Journal Articles | 2 |
| Reports - Research | 2 |
| Reports - Evaluative | 1 |
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Peer reviewedTsutakawa, Robert K. – Journal of Educational Statistics, 1984
The EM algorithm is used to derive maximum likelihood estimates for item parameters of the two-parameter logistic item response curves. The observed information matrix is then used to approximate the covariance matrix of these estimates. Simulated data are used to compare the estimated and actual item parameters. (Author/BW)
Descriptors: Computer Simulation, Estimation (Mathematics), Latent Trait Theory, Mathematical Formulas
Peer reviewedRost, Jurgen – Applied Psychological Measurement, 1988
A generalized Rasch model is presented for measuring attitudes; it is based on the concepts of Thurstone's method of successive intervals. Benefits of the model are illustrated with a study of students' (N=4,035 fifth through ninth graders) interest in physics. (SLD)
Descriptors: Attitude Measures, Children, Elementary Secondary Education, Equations (Mathematics)
