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HomeTDWNAEP Analysis and ScalingEstimation of NAEP Score ScalesNAEP Assessment IRT ParametersU.S. History Assessment IRT ParametersIRT 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 Permitted [R3]): 2001
NAEP Technical DocumentationIRT 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 permitted [R3]): 2001
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4 dj5
H3 1 H035601 1.04 -0.46 0.22 † † † † †
2 H035602 1.90 0.56 0.28 † † † † †
9 H036201 0.43 -1.52 0.24 † † † † †
16 H036702 1.21 -1.84 0.24 † † † † †
H4 4 H059101 0.88 0.87 0.28 † † † † †
7 H059401 1.08 0.40 0.23 † † † † †
11 H059801 0.81 0.04 0.00 -0.19 0.19 † † †
14 H060101 1.75 1.28 0.32 † † † † †
16 H060301 1.04 -0.02 0.24 † † † † †
H5 10 H038501 0.89 0.90 0.19 † † † † †
11 H038601 0.43 2.33 0.00 0.22 -0.22 † † †
14 H038801 1.17 0.82 0.31 † † † † †
15 H038802 0.71 -0.02 0.28 † † † † †
16 H038901 1.23 0.89 0.20 † † † † †
H6 4 H039401 0.68 0.24 0.00 1.53 -1.53 † † †
8 H039801 1.26 0.08 0.21 † † † † †
H7 1 H057201 0.39 -0.71 0.24 † † † † †
2 H057301 0.88 -1.38 0.21 † † † † †
6 H057701 0.47 -1.46 0.00 1.18 -1.18 † † †
7 H057801 0.65 0.43 0.00 0.31 -0.31 † † †
8 H057901 0.93 -1.06 0.24 † † † † †
H8 2 H034201 0.95 0.63 0.32 † † † † †
3 H034301 0.66 -0.69 0.23 † † † † †
6 H034601 0.53 -0.66 0.25 † † † † †
H9 1 H060401 0.84 0.98 0.19 † † † † †
2 H060501 0.96 0.69 0.18 † † † † †
6 H060901 0.63 -0.41 0.28 † † † † †
7 H061001 0.55 0.21 0.22 † † † † †
8 H061101 0.58 1.17 0.18 † † † † †
10 H061301 0.62 1.14 0.25 † † † † †
13 H061601 0.49 0.60 0.00 1.75 -1.75 † † †
H11 1 H043201 0.78 -0.02 0.00 1.05 -1.05 † † †
2 H043301 0.96 0.58 0.24 † † † † †
3 H043401 0.69 0.03 0.00 0.45 -0.45 † † †
4 H043501 0.61 -0.07 0.00 † † † † †
5 H043601 0.59 0.59 0.00 -0.20 0.20 † † †
6 H043701 0.47 0.42 0.00 -0.32 0.32 † † †
7 H043702 1.24 1.19 0.16 † † † † †
8 H043703 1.74 0.30 0.25 † † † † †
9 H043704 1.03 1.54 0.21 † † † † †
10 H043705 0.70 1.61 0.00 † † † † †
11 H043801 1.22 -0.34 0.29 † † † † †
12 H043901 0.74 -0.88 0.26 † † † † †
13 H044001 0.54 1.29 0.00 0.78 0.14 -0.91 † †
† 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.
Last updated 15 July 2008 (KL)

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