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HomeTDWNAEP Analysis and ScalingEstimation of NAEP Scale ScoresNAEP Assessment IRT ParametersU.S. History Assessment IRT ParametersIRT 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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