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, Grade 12 U.S. History National Assessment, by Item and Block: 2010
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 | dj5 |
|---|---|---|---|---|---|---|---|---|---|---|
| † Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models. 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 represents the category threshold parameter for category i. The c parameter value is exactly zero for items scaled with the two-parameter logistic model. For item j, dji may not sum to zero because of rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010 U.S. History Assessment. |
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| H3 | 10 | H074401 | 0.73 | 0.62 | † | 0.73 | -0.73 | † | † | † | H4 | 3 | H045701 | 1.00 | 0.69 | 0.23 | † | † | † | † | † |
| 5 | H045901 | 1.02 | 0.40 | † | 0.74 | -0.74 | † | † | † | |
| 6 | H046001 | 0.67 | 1.00 | † | † | † | † | † | † | |
| 12 | H046501 | 1.33 | 1.11 | 0.19 | † | † | † | † | † | |
| 17 | H046901 | 2.28 | 0.77 | 0.24 | † | † | † | † | † | |
| 18 | H046902 | 2.49 | 0.95 | 0.31 | † | † | † | † | † | |
| H5 | 5 | H062401 | 1.34 | 1.26 | 0.18 | † | † | † | † | † |
| 6 | H062501 | 1.67 | 1.28 | 0.37 | † | † | † | † | † | |
| 7 | H062601 | 0.67 | 0.04 | 0.30 | † | † | † | † | † | |
| 9 | H062801 | 1.03 | 1.53 | 0.11 | † | † | † | † | † | |
| 10 | H062901 | 0.70 | -0.07 | 0.28 | † | † | † | † | † | |
| 11 | H063001 | 1.01 | 1.03 | 0.20 | † | † | † | † | † | |
| H6 | 1 | H048601 | 0.55 | -0.63 | 0.27 | † | † | † | † | † |
| 2 | H048701 | 0.61 | 0.19 | 0.21 | † | † | † | † | † | |
| 3 | H048801Z | 1.44 | 1.41 | 0.26 | † | † | † | † | † | |
| 4 | H048901 | 0.48 | 1.51 | † | -1.53 | 1.53 | † | † | † | |
| 6 | H049101 | 0.89 | 0.65 | 0.25 | † | † | † | † | † | |
| 7 | H049102 | 0.56 | -1.33 | 0.22 | † | † | † | † | † | |
| 10 | H049401 | 0.72 | 2.86 | † | 0.76 | -0.40 | -0.36 | † | † | |
| H7 | 5 | H075701 | 0.75 | 0.19 | † | 1.71 | -1.71 | † | † | † |
| 8 | H076001 | 0.70 | 0.69 | 0.23 | † | † | † | † | † | |
| 18 | H077001Z | 0.21 | 3.60 | 0.29 | † | † | † | † | † | |
| H8 | 1 | H084701 | 0.35 | 0.53 | 0.23 | † | † | † | † | † |
| 3 | H095601 | 0.55 | -0.02 | 0.22 | † | † | † | † | † | |
| 6 | H091401 | 0.52 | -0.93 | 0.25 | † | † | † | † | † | |
| 7 | H093201 | 0.82 | 1.72 | 0.39 | † | † | † | † | † | |
| 15 | H097001 | 0.45 | 0.93 | † | 2.04 | -2.04 | † | † | † | |
| H9 | 3 | H094001 | 0.55 | 0.88 | 0.28 | † | † | † | † | † |
| 4 | H094401 | 1.29 | 1.56 | 0.22 | † | † | † | † | † | |
| 6 | H096001 | 0.89 | 1.76 | 0.18 | † | † | † | † | † | |
| 10 | H094701 | 0.39 | 0.55 | 0.24 | † | † | † | † | † | |
| H10 | 2 | H042001 | 0.88 | 0.91 | 0.22 | † | † | † | † | † |
| 8 | H042501 | 1.43 | 0.51 | 0.18 | † | † | † | † | † | |
| 9 | H042601 | 0.92 | -0.69 | 0.28 | † | † | † | † | † | |
| 10 | H042602 | 1.07 | 1.75 | 0.07 | † | † | † | † | † | |
| 13 | H042801 | 0.99 | 0.59 | † | † | † | † | † | † | |
| H11 | 12 | H064901 | 0.63 | 0.25 | † | 0.50 | -0.50 | † | † | † |
Last updated 01 July 2014 (GF)