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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 Not Permitted [R2]): 2000
NAEP Technical DocumentationIRT parameters for the geometry and spatial sense scale, by block and item, grade 8 mathematics state assessment (accommodations not permitted [R2]): 2000
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
M3 5 M093401 0.97 0.70 0.22 † † † †
M4 3 M017601 0.55 -1.28 0.33 † † † †
7 M018001 0.81 -0.20 0.25 † † † †
17 M019001 0.73 0.59 0.11 † † † †
21 M019601 0.61 1.27 0.09 † † † †
M6 11A M020901 0.66 0.20 0.00 † † † †
12A M021001 0.91 -0.05 0.00 † † † †
15,16 M0213CL 0.59 -0.42 0.00 -0.37 0.37 † †
2A M019801 1.17 -0.76 0.00 † † † †
3A M019901 0.66 -1.75 0.00 † † † †
M7 8 M068007 0.55 0.07 0.05 † † † †
10A M068201 0.32 1.59 0.00 † † † †
5A M068003 0.56 -0.39 0.00 -2.02 2.02 † †
6A M068005 0.50 -0.56 0.00 -1.37 1.37 † †
7A M068006 0.44 0.51 0.00 -1.60 1.60 † †
M8 6A M012731 0.67 1.61 0.19 † † † †
7A M012831 1.08 0.34 0.11 † † † †
M9 4 M052601 0.51 0.44 0.09 † † † †
M10 4 M085801 0.77 0.06 0.21 † † † †
3A M085701 0.50 -0.36 0.00 † † † †
5A M085901 0.48 -0.04 0.00 1.04 -1.04 † †
M11 2 M046101 0.76 -2.09 0.24 † † † †
3 M046201 1.10 -0.69 0.20 † † † †
5 M046401 0.88 -0.95 0.24 † † † †
8 M046701 1.21 -0.06 0.26 † † † †
19A M048001 1.71 1.33 0.13 † † † †
M12 4A M092401 0.59 1.59 0.00 2.04 -2.04 † †
M13 7 M051801 1.51 1.53 0.26 † † † †
9 M052001 0.99 1.27 0.19 † † † †
M15 7A M075801 0.77 1.10 0.00 0.24 -0.24 † †
† 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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