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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → U.S. History Assessment IRT Parameters → IRT Parameters for the Change and Continuity in American Democracy: Ideas, Institutions, Practices, and Controversies Scale, by Block and Item, Grade 12 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 | dj5 |
|---|---|---|---|---|---|---|---|---|---|---|
| H3 | 4 | H044401 | 0.91 | -0.66 | 0.16 | † | † | † | † | † |
| 5 | H044501 | 0.52 | 0.85 | 0.00 | -1.18 | 1.93 | -0.75 | † | † | |
| 10 | H044901 | 0.67 | 0.75 | 0.27 | † | † | † | † | † | |
| H4 | 3 | H045701 | 0.77 | 0.51 | 0.16 | † | † | † | † | † |
| 5 | H045901 | 0.88 | 0.46 | 0.00 | 0.77 | -0.77 | † | † | † | |
| 6 | H046001 | 0.60 | 1.12 | 0.00 | † | † | † | † | † | |
| 12 | H046501 | 1.61 | 1.20 | 0.17 | † | † | † | † | † | |
| 17 | H046901 | 1.29 | 0.70 | 0.18 | † | † | † | † | † | |
| 18 | H046902 | 1.39 | 0.82 | 0.28 | † | † | † | † | † | |
| H5 | 5 | H062401 | 1.15 | 1.29 | 0.18 | † | † | † | † | † |
| 6 | H062501 | 0.59 | 0.89 | 0.22 | † | † | † | † | † | |
| 7 | H062601 | 0.57 | -0.19 | 0.20 | † | † | † | † | † | |
| 9 | H062801 | 1.07 | 1.48 | 0.10 | † | † | † | † | † | |
| 10 | H062901 | 0.74 | -0.12 | 0.19 | † | † | † | † | † | |
| 11 | H063001 | 1.18 | 1.44 | 0.23 | † | † | † | † | † | |
| H6 | 1 | H048601 | 0.52 | -0.69 | 0.19 | † | † | † | † | † |
| 2 | H048701 | 0.61 | 0.57 | 0.18 | † | † | † | † | † | |
| 3 | H048801 | 1.11 | 1.40 | 0.18 | † | † | † | † | † | |
| 4 | H048901 | 0.51 | 1.45 | 0.00 | -1.79 | 1.79 | † | † | † | |
| 6 | H049101 | 0.87 | 0.67 | 0.23 | † | † | † | † | † | |
| 7 | H049102 | 0.54 | -1.50 | 0.18 | † | † | † | † | † | |
| 10 | H049401 | 0.62 | 2.52 | 0.00 | 0.10 | -0.11 | 0.02 | † | † | |
| H7 | 2 | H050101 | 0.65 | 1.04 | 0.00 | 0.05 | -0.49 | 0.44 | † | † |
| 7 | H050401 | 0.89 | 1.29 | 0.19 | † | † | † | † | † | |
| 8 | H050501 | 0.83 | 0.99 | 0.14 | † | † | † | † | † | |
| H8 | 2 | H051401 | 0.57 | 2.11 | 0.28 | † | † | † | † | † |
| 3 | H051501 | 2.23 | 0.98 | 0.28 | † | † | † | † | † | |
| 4 | H051601 | 1.00 | 1.21 | 0.13 | † | † | † | † | † | |
| 8 | H052001 | 0.71 | -0.62 | 0.18 | † | † | † | † | † | |
| 13 | H052401 | 1.62 | 1.60 | 0.21 | † | † | † | † | † | |
| H9 | 3 | H060601 | 0.63 | 0.11 | 0.16 | † | † | † | † | † |
| 4 | H060701 | 0.90 | 0.99 | 0.00 | 0.15 | -0.15 | † | † | † | |
| 11 | H061401 | 0.73 | -1.27 | 0.19 | † | † | † | † | † | |
| 12 | H061501 | 0.68 | -0.08 | 0.00 | 0.30 | -0.30 | † | † | † | |
| 16 | H061901 | 0.62 | -0.37 | 0.18 | † | † | † | † | † | |
| H10 | 2 | H042001 | 0.60 | 0.76 | 0.17 | † | † | † | † | † |
| 8 | H042501 | 1.22 | 0.41 | 0.13 | † | † | † | † | † | |
| 9 | H042601 | 0.80 | -0.90 | 0.19 | † | † | † | † | † | |
| 10 | H042602 | 1.04 | 1.69 | 0.08 | † | † | † | † | † | |
| 13 | H042801 | 1.05 | 0.74 | 0.00 | † | † | † | † | † | |
| H11 | 12 | H064901 | 0.66 | 0.43 | 0.00 | 0.46 | -0.46 | † | † | † |
| † Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. NOTE: For item j, aj represents the discriminatory power of the item, bj represents a location parameter related to item difficulty, cj represents the guessing parameter, and dji is the category threshold parameter for category i. The c-parameter value is exactly zero for items scaled with the two-parameter logistic model or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001 U.S. History Assessment. |
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Last updated 14 July 2008 (KL)