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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 Gathering of Interactions of Peoples, Cultures, and Ideas Scale, Grade 12 U.S. History National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the gathering of interactions of peoples, cultures, and ideas scale, grade 12 U.S. history national main assessment, by item and block: 2006
Block Item NAEP ID aj bj cj dj1 dj2 dj3
† 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 2 H073601 1.38 0.99 0.22 † † †
3 H073701 1.23 0.79 0.38 † † †
5 H073901 1.02 -0.57 0.26 † † †
6 H074001 0.47 -0.10 † -1.45 1.45 †
17 H075101 0.47 1.14 † 1.25 -0.05 -1.20
18 H075201 1.40 0.99 0.20 † † †
H4 1 H045509 0.54 0.47 † 0.63 -0.63 †
7 H046101 0.32 2.33 † † † †
H5 2 H062101 0.94 2.43 0.18 † † †
15 H063401 0.64 -0.16 † 1.00 0.15 -1.14
H6 5 H049001 0.44 0.00 0.27 † † †
8 H049201 1.28 1.29 0.20 † † †
9 H049301 1.27 0.89 0.31 † † †
11 H049501 0.93 -1.07 0.24 † † †
12 H049502 1.15 0.77 0.30 † † †
13 H049503 0.89 1.57 † 0.65 -0.65 †
H7 6 H075801 0.79 0.69 0.15 † † †
9 H076101 0.54 0.84 0.23 † † †
10 H076201 1.62 0.06 0.19 † † †
14 H076601 0.68 1.08 0.18 † † †
H8 1 H051301 0.79 1.01 † 0.60 -0.60 †
5 H051701 1.96 1.27 0.19 † † †
6 H051801 1.27 0.22 0.27 † † †
7 H051901 1.50 0.40 0.13 † † †
H9 1 H060401 0.90 0.55 0.24 † † †
2 H060501 0.73 0.08 0.25 † † †
6 H060901 0.65 -0.79 0.34 † † †
7 H061001 0.71 0.62 0.36 † † †
8 H061101 0.69 1.33 0.30 † † †
10 H061301 1.37 0.66 0.28 † † †
13 H061601 0.45 -0.66 † 1.51 -1.51 †
H11 13 H065001 1.29 -0.41 0.28 † † †
14 H065101 0.75 0.82 † 0.76 -0.76 †
15 H065201 0.68 0.23 † 0.72 -0.72 †
16 H065301 0.78 0.23 † 0.74 -0.74 †
17 H065401 0.61 0.41 † 1.07 -0.59 -0.48
Last updated 08 January 2010 (JL)

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