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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 State Assessment (Accommodations Permitted [R3]): 2000
NAEP Technical DocumentationIRT parameters for the geometry and spatial sense scale, by block and item, grade 8 mathematics state assessment (accommodations permitted [R3]): 2000
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
M3 5 M093401 1.11 0.72 0.22 † † † †
M4 3 M017601 0.55 -1.23 0.35 † † † †
7 M018001 0.80 -0.18 0.24 † † † †
17 M019001 0.73 0.60 0.10 † † † †
21 M019601 0.69 1.35 0.12 † † † †
M6 11A M020901 0.67 0.23 0.00 † † † †
12A M021001 0.95 0.00 0.00 † † † †
15,1 M0213CL 6 0.587 -0.39 0.00 -0.39 0.39 † †
2A M019801 1.17 -0.72 0.00 † † † †
3A M019901 0.66 -1.70 0.00 † † † †
M7 8 M068007 0.57 0.12 0.05 † † † †
10A M068201 0.31 1.60 0.00 † † † †
5A M068003 0.56 -0.36 0.00 -2.11 2.11 † †
6A M068005 0.52 -0.51 0.00 -1.29 1.29 † †
7A M068006 0.45 0.53 0.00 -1.60 1.60 † †
M8 6A M012731 0.68 1.60 0.18 † † † †
7A M012831 1.10 0.38 0.11 † † † †
M9 4 M052601 0.52 0.50 0.10 † † † †
M10 4 M085801 0.86 0.22 0.26 † † † †
3A M085701 0.50 -0.36 0.00 † † † †
5A M085901 0.48 -0.01 0.00 1.04 -1.04 † †
M11 2 M046101 0.77 -1.88 0.31 † † † †
3 M046201 1.13 -0.62 0.20 † † † †
5 M046401 0.95 -0.79 0.28 † † † †
8 M046701 1.36 0.08 0.30 † † † †
19A M048001 1.68 1.34 0.12 † † † †
M12 4A M092401 0.62 1.58 0.00 1.95 -1.95 † †
M13 7 M051801 1.56 1.53 0.27 † † † †
9 M052001 1.04 1.28 0.19 † † † †
M15 7A M075801 0.79 1.10 0.00 0.22 -0.22 † †
† 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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