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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 8 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 8 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 1 H035601 1.26 -0.29 0.27 † † †
2 H035602 1.56 0.47 0.25 † † †
9 H036201 0.49 -1.49 0.25 † † †
16 H036702 1.13 -1.86 0.25 † † †
H4 4 H059101 0.89 0.76 0.28 † † †
7 H059401 1.14 0.43 0.25 † † †
11 H059801 0.84 0.02 † -0.19 0.19 †
14 H060101 1.97 1.14 0.32 † † †
16 H060301 1.01 -0.01 0.25 † † †
H5 10 H038501 1.03 0.92 0.23 † † †
11 H038601 0.39 2.59 † 0.32 -0.32 †
14 H038801 1.31 0.80 0.29 † † †
15 H038802 0.96 0.12 0.33 † † †
16 H038901 1.28 0.80 0.22 † † †
H6 4 H069001 0.68 0.29 † 0.34 -0.34 †
5 H069101 0.92 0.76 0.40 † † †
6 H069201 0.51 -0.14 0.24 † † †
7 H069301 1.00 0.31 0.23 † † †
11 H069701 1.10 -0.02 0.20 † † †
12 H069801 0.46 0.23 † 1.30 0.03 -1.33
15 H070101 0.93 0.92 0.21 † † †
H7 1 H057201 0.39 -0.71 0.24 † † †
2 H057301 0.93 -1.33 0.22 † † †
6 H057701 0.45 -1.53 † 1.37 -1.37 †
7 H057801 0.59 0.51 † 0.37 -0.37 †
8 H057901 0.91 -1.03 0.25 † † †
H8 2 H034201 0.89 0.73 0.31 † † †
3 H034301 0.64 -0.50 0.28 † † †
6 H034601 0.50 -0.78 0.26 † † †
H9 1 H060401 0.67 1.14 0.20 † † †
2 H060501 0.92 0.83 0.19 † † †
6 H060901 0.68 -0.45 0.33 † † †
7 H061001 0.63 0.05 0.24 † † †
8 H061101 0.59 1.23 0.21 † † †
10 H061301 0.63 1.12 0.24 † † †
13 H061601 0.56 0.42 † 1.60 -1.60 †
H11 5 H070701 0.49 1.41 † -2.97 1.95 1.02
6 H070801 0.74 1.27 † 0.53 -0.53 †
7 H070901 1.38 0.84 0.17 † † †
14 H071601 0.58 1.06 † 0.47 -0.47 †
H12 12 H073001 0.42 0.50 † 0.29 -0.29 †
16 H073401 0.70 1.01 0.23 † † †
Last updated 10 December 2009 (JL)

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