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NAEP Analysis and Scaling → Estimation of NAEP Scale Scores → NAEP Assessment IRT Parameters → U.S. History Assessment IRT Parameters → IRT Parameters for the Changing Role of America in the World Scale, Grade 4 U.S. History National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the changing role of America in the world scale, grade 4 U.S. history national main assessment, by item and block: 2006
Block Item NAEP ID aj bj cj dj1 dj2
† 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), 2006 U.S. History Assessment.
H3 14 H066801 0.62 1.01 0.18 † †
15 H066901 0.66 0.27 0.19 † †
H4 15 H055501 0.88 2.19 0.16 † †
16 H055601 1.31 2.42 0.15 † †
H6 1 H067101 1.25 0.30 0.16 † †
2 H067201 1.29 0.51 0.14 † †
14 H068401 0.49 -0.21 0.20 † †
15 H068501 0.58 1.61 † -0.74 0.74
16 H068601 0.91 1.02 0.22 † †
H7 14 H058501 0.38 3.03 0.28 † †
H8 1 H034101 0.67 0.66 † 2.52 -2.52
5 H034501 0.55 3.24 † † †
14 H035201 0.55 2.39 0.20 † †
17 H035501 0.69 1.24 0.18 † †
Last updated 08 January 2010 (JL)

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