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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, by Block and Item, Grade 8 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001
NAEP Technical DocumentationIRT parameters for the changing role of America in the world 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
H3 7 H036001 1.43 0.35 0.32 † † †
8 H036101 0.44 -0.48 0.00 -1.43 1.43 †
13 H036501 1.08 0.11 0.23 † † †
H4 13 H060001 0.98 1.81 0.24 † † †
H5 8 H038301 0.93 0.58 0.00 -0.15 0.15 †
12 H038701 0.45 -0.95 0.25 † † †
13 H038702 0.73 1.65 0.00 0.90 -0.90 †
H6 1 H039101 0.53 0.12 0.33 † † †
3 H039301 0.89 1.08 0.28 † † †
6 H039601 1.28 1.32 0.28 † † †
7 H039701 0.97 1.40 0.27 † † †
H7 14 H058501 0.54 0.69 0.25 † † †
H8 1 H034101 0.94 0.44 0.00 2.75 -0.75 -2.00
5 H034501 1.15 0.78 0.00 † † †
14 H035201 0.95 0.35 0.26 † † †
17 H035501 0.70 -0.92 0.25 † † †
H9 14 H061701 0.88 1.76 0.20 † † †
15 H061801 0.81 1.65 0.00 1.14 -1.14 †
H10 1 H041901 1.04 1.56 0.32 † † †
5 H042201 0.78 2.50 0.00 0.50 -0.50 †
6 H042301 0.60 2.54 0.21 † † †
7 H042401 0.52 2.31 0.20 † † †
Cluster: 14,15 H0429CL 0.52 0.39 0.00 0.79 -0.37 -0.42
† 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 14 July 2008 (KL)

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