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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, Grade 4 U.S. History National Assessment, by Item and Block: 2010
NAEP Technical DocumentationIRT parameters for the gathering of interactions of peoples, cultures, and ideas scale, grade 4 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.
H3 2 H065601 1.65 1.27 0.27 † † † † †
3 H065701 0.75 1.28 † 2.21 -0.49 -1.73 † †
5 H065901 0.93 0.91 0.24 † † † † †
7 H066101 1.01 1.86 0.33 † † † † †
8 H066201 1.17 0.94 0.28 † † † † †
13 H066701 0.52 1.03 † 1.72 -1.72 † † †
16 H067001 0.90 -0.08 0.39 † † † † †
H4 1 H054101 1.42 1.67 0.21 † † † † †
9 H054901 0.65 0.53 † 0.47 -0.47 † † †
H5 1 H055701 1.34 1.12 0.35 † † † † †
2 H055801 1.26 0.98 0.24 † † † † †
3 H055901 0.67 0.16 † 0.71 -0.71 † † †
5 H056101 0.89 0.91 † -0.29 0.29 † † †
8 H056401 0.53 -0.52 † 0.84 -0.84 † † †
10 H056601 0.66 0.18 † 0.98 -0.98 † † †
13 H056901 0.65 0.24 0.19 † † † † †
14 H057001 0.68 0.85 0.32 † † † † †
H6 3 H067301 1.25 1.12 0.23 † † † † †
5 H067501 0.66 0.53 0.28 † † † † †
6 H067601 1.17 0.71 0.25 † † † † †
9 H067901 1.41 1.25 0.28 † † † † †
10 H068001 0.48 0.79 † 2.64 -1.14 -1.49 † †
12 H068201 0.59 1.21 † 0.81 -0.81 † † †
H7 2 H0972CL 0.32 -0.34 † 5.84 -0.12 -5.71 † †
7 H078701 0.94 0.36 0.27 † † † † †
10 H081301 1.06 0.46 0.38 † † † † †
11 H081302 1.91 0.80 0.28 † † † † †
12 H0815CL 0.21 -0.12 † 6.30 -0.14 -6.17 † †
14 H079301 0.68 1.75 † 1.20 0.43 -1.63 † †
H8 2 H078401 0.51 0.74 † 1.15 0.47 -1.62 † †
15 H081701 1.11 -0.79 0.34 † † † † †
Last updated 01 July 2014 (GF)
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