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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for the Geometry and Spatial Sense Scale, by Block and Item, Grade 8 Mathematics National Main Assessment (Accommodations Permitted [R3]): 2000
NAEP Technical DocumentationIRT parameters for the geometry and spatial sense scale, by block and item, grade 8 mathematics national main assessment (accommodations permitted [R3]): 2000
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
M3 5 M093401 1.00 0.63 0.20 † † † †
M4 3 M017601 0.57 -1.22 0.30 † † † †
7 M018001 0.73 -0.14 0.26 † † † †
17 M019001 0.74 0.65 0.12 † † † †
21 M019601 0.74 1.21 0.12 † † † †
M6 0 M0213CL 0.64 -0.38 0.00 -0.34 0.34 † †
2 M019801 1.14 -0.77 0.00 † † † †
3 M019901 0.69 -1.64 0.00 † † † †
11 M020901 0.63 0.27 0.00 † † † †
12 M021001 0.97 -0.06 0.00 † † † †
M7 5 M068003 0.64 -0.39 0.00 -1.65 1.65 † †
6 M068005 0.45 -0.53 0.00 -1.62 1.62 † †
7 M068006 0.46 0.56 0.00 -1.56 1.56 † †
8 M068007 0.62 0.19 0.07 † † † †
10 M068201 0.27 1.87 0.00 † † † †
M8 6 M012731 0.43 1.64 0.13 † † † †
7 M012831 1.33 0.28 0.12 † † † †
M9 4 M052601 0.65 0.44 0.10 † † † †
M10 3 M085701 0.45 -0.38 0.00 † † † †
4 M085801 0.73 0.02 0.21 † † † †
5 M085901 0.51 0.07 0.00 0.95 -0.95 † †
M11 2 M046101 1.00 -1.80 0.27 † † † †
3 M046201 1.21 -0.53 0.32 † † † †
5 M046401 1.04 -0.99 0.21 † † † †
8 M046701 1.20 -0.07 0.25 † † † †
19 M048001 1.13 1.29 0.08 † † † †
M12 4 M092401 0.63 1.36 0.00 1.91 -1.91 † †
M13 7 M051801 0.98 1.76 0.26 † † † †
9 M052001 0.90 1.27 0.17 † † † †
M15 7 M075801 0.82 1.03 0.00 0.30 -0.30 † †
† 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), 2000 Mathematics Assessment.
Last updated 14 July 2008 (KL)

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