Descriptor
| Item Analysis | 2 |
| Latent Trait Theory | 2 |
| Measurement | 2 |
| Comparative Analysis | 1 |
| Mathematical Models | 1 |
| Psychometrics | 1 |
| Statistical Bias | 1 |
| Test Bias | 1 |
| Test Construction | 1 |
Source
| Educational and Psychological… | 2 |
Author
| Douglas, Graham A. | 2 |
| Wright, Benjamin D. | 2 |
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Peer reviewedWright, Benjamin D.; Douglas, Graham A. – Educational and Psychological Measurement, 1977
Two procedures for Rasch, sample-free item calibration are reviewed and compared for accuracy. The theoretically ideal "conditional" procedure is impractical for more than fifteen items. The more practical but biased "unconditional" procedure is discussed in detail. (Author/JKS)
Descriptors: Comparative Analysis, Item Analysis, Latent Trait Theory, Mathematical Models
Peer reviewedWright, Benjamin D.; Douglas, Graham A. – Educational and Psychological Measurement, 1977
Procedures for the Rasch model, sample free item calibration are reviewed and compared for accuracy. The theoretically ideal procedure is shown to have practical limitations. Two alternatives to the ideal are presented and discussed. A correction for bias in the most widely used alternative is presented. (Author/JKS)
Descriptors: Item Analysis, Latent Trait Theory, Measurement, Psychometrics
