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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 Changing Role of America in the World Scale, Grade 8 U.S. History National Assessment, by Item and Block: 2010
NAEP Technical DocumentationIRT parameters for the changing role of America in the world scale, grade 8 U.S. history national main 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 7 H036001 1.22 0.40 0.34 † † † † †
8 H036101 0.96 -0.67 † † † † † †
13 H036501 1.19 0.16 0.29 † † † † †
H4 13 H060001 0.94 2.20 0.23 † † † † †
H5 8 H038301 0.76 0.44 † -0.37 0.37 † † †
12 H038701 0.45 -1.11 0.28 † † † † †
13 H038702 0.67 1.62 † 0.91 -0.91 † † †
H6 1 H068701 0.74 -0.14 0.32 † † † † †
2 H068801 0.68 1.54 0.38 † † † † †
9 H069501 0.45 1.26 0.27 † † † † †
14 H070001 0.67 0.66 † † † † † †
16 H070201 1.66 1.24 0.18 † † † † †
H7 2 H077301 0.72 1.78 0.29 † † † † †
4 H088201 1.06 -0.26 0.30 † † † † †
9 H090201 0.66 1.12 † -0.33 0.33 0.00 † †
14 H089201 1.20 2.34 0.43 † † † † †
15 H087901 1.17 -0.13 0.24 † † † † †
16 H089501 0.69 0.35 0.27 † † † † †
H8 5 H085001 0.83 0.30 0.24 † † † † †
7 H090101 0.68 1.32 0.25 † † † † †
14 H083901 0.82 0.83 0.25 † † † † †
17 H086301 0.80 -0.05 0.26 † † † † †
H9 3 H097901 0.87 -0.23 † 0.28 -0.28 † † †
8 H083401 0.83 0.16 0.25 † † † † †
11 H083701 0.86 0.98 0.29 † † † † †
16 H084601 0.95 1.39 0.18 † † † † †
17 H087701 1.29 1.39 0.29 † † † † †
H10 1 H041901 1.20 1.66 0.30 † † † † †
5 H042201 0.83 2.18 † 0.58 -0.58 † † †
6 H042301 0.50 2.59 0.26 † † † † †
7 H042401 0.49 2.44 0.21 † † † † †
15 H0429CL 0.38 0.08 † 0.55 -0.00 -0.55 † †
Last updated 01 July 2014 (GF)
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