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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 Gathering of Interactions of Peoples, Cultures, and Ideas Scale, by Block and Item, Grade 8 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 | dj5 |
|---|---|---|---|---|---|---|---|---|---|---|
| H3 | 1 | H035601 | 1.12 | -0.48 | 0.22 | † | † | † | † | † |
| 2 | H035602 | 1.35 | 0.56 | 0.24 | † | † | † | † | † | |
| 9 | H036201 | 0.45 | -1.39 | 0.22 | † | † | † | † | † | |
| 16 | H036702 | 1.15 | -1.89 | 0.22 | † | † | † | † | † | |
| H4 | 4 | H059101 | 0.69 | 0.85 | 0.27 | † | † | † | † | † |
| 7 | H059401 | 1.08 | 0.38 | 0.21 | † | † | † | † | † | |
| 11 | H059801 | 0.80 | 0.02 | 0.00 | -0.17 | 0.17 | † | † | † | |
| 14 | H060101 | 1.47 | 1.34 | 0.31 | † | † | † | † | † | |
| 16 | H060301 | 0.96 | -0.07 | 0.21 | † | † | † | † | † | |
| H5 | 10 | H038501 | 0.93 | 0.86 | 0.19 | † | † | † | † | † |
| 11 | H038601 | 0.37 | 2.64 | 0.00 | 0.17 | -0.17 | † | † | † | |
| 14 | H038801 | 0.79 | 0.56 | 0.23 | † | † | † | † | † | |
| 15 | H038802 | 0.69 | -0.30 | 0.26 | † | † | † | † | † | |
| 16 | H038901 | 0.94 | 0.93 | 0.23 | † | † | † | † | † | |
| H6 | 4 | H039401 | 0.68 | 0.24 | 0.00 | 1.46 | -1.46 | † | † | † |
| 8 | H039801 | 1.27 | 0.00 | 0.17 | † | † | † | † | † | |
| H7 | 1 | H057201 | 0.41 | -0.66 | 0.22 | † | † | † | † | † |
| 2 | H057301 | 0.87 | -1.45 | 0.21 | † | † | † | † | † | |
| 6 | H057701 | 0.49 | -1.51 | 0.00 | 1.26 | -1.26 | † | † | † | |
| 7 | H057801 | 0.61 | 0.43 | 0.00 | 0.32 | -0.32 | † | † | † | |
| 8 | H057901 | 0.90 | -1.15 | 0.23 | † | † | † | † | † | |
| H8 | 2 | H034201 | 0.69 | 0.53 | 0.29 | † | † | † | † | † |
| 3 | H034301 | 0.57 | -0.73 | 0.22 | † | † | † | † | † | |
| 6 | H034601 | 0.48 | -1.00 | 0.23 | † | † | † | † | † | |
| H9 | 1 | H060401 | 0.83 | 0.99 | 0.18 | † | † | † | † | † |
| 2 | H060501 | 0.94 | 0.65 | 0.17 | † | † | † | † | † | |
| 6 | H060901 | 0.54 | -0.56 | 0.24 | † | † | † | † | † | |
| 7 | H061001 | 0.47 | 0.23 | 0.22 | † | † | † | † | † | |
| 8 | H061101 | 0.58 | 1.20 | 0.18 | † | † | † | † | † | |
| 10 | H061301 | 0.58 | 1.23 | 0.25 | † | † | † | † | † | |
| 13 | H061601 | 0.49 | 0.56 | 0.00 | 1.77 | -1.77 | † | † | † | |
| H11 | 1 | H043201 | 0.69 | -0.06 | 0.00 | 1.07 | -1.07 | † | † | † |
| 2 | H043301 | 0.95 | 0.59 | 0.21 | † | † | † | † | † | |
| 3 | H043401 | 0.64 | 0.06 | 0.00 | 0.39 | -0.39 | † | † | † | |
| 4 | H043501 | 0.63 | 1.29 | 0.00 | 1.24 | -1.24 | † | † | † | |
| 5 | H043601 | 0.57 | 0.60 | 0.00 | -0.25 | 0.25 | † | † | † | |
| 6 | H043701 | 0.44 | 0.39 | 0.00 | -0.50 | 0.50 | † | † | † | |
| 7 | H043702 | 1.21 | 1.25 | 0.16 | † | † | † | † | † | |
| 8 | H043703 | 1.28 | 0.24 | 0.20 | † | † | † | † | † | |
| 9 | H043704 | 0.97 | 1.79 | 0.22 | † | † | † | † | † | |
| 10 | H043705 | 0.72 | 1.70 | 0.00 | † | † | † | † | † | |
| 11 | H043801 | 1.00 | -0.40 | 0.29 | † | † | † | † | † | |
| 12 | H043901 | 0.80 | -0.80 | 0.23 | † | † | † | † | † | |
| 13 | H044001 | 0.64 | 1.31 | 0.00 | 0.82 | 0.11 | -0.93 | † | † | |
| † 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 15 July 2008 (KL)
