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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 12 Mathematics National Main Assessment (Accommodations Not Permitted [R2]): 2000
NAEP Technical DocumentationIRT parameters for the geometry and spatial sense scale, by block and item, grade 12 mathematics national main assessment (accommodations not permitted [R2]): 2000
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
M3 3 M056001 0.89 -0.88 0.12 † † † †
11 M056701 1.99 1.45 0.15 † † † †
M4 3 M017601 0.63 -1.78 0.33 † † † †
7 M018001 1.12 -0.29 0.41 † † † †
17 M019001 0.81 -0.28 0.17 † † † †
M5 7 M071101 0.52 0.53 0.00 -1.42 1.42 † †
9 M071301 1.13 1.41 0.00 0.08 -0.08 † †
M6 11 M020901 0.63 -0.22 0.00 † † † †
12 M021001 0.80 -1.11 0.00 † † † †
17 M021801 1.43 1.30 0.00 † † † †
M8 6 M012731 0.87 -0.06 0.12 † † † †
7 M012831 1.18 -0.97 0.11 † † † †
17 M011731 1.50 0.25 0.20 † † † †
M9 4 M052601 0.63 -0.08 0.16 † † † †
8 M053301 1.30 1.73 0.00 † † † †
M10 1 M093901 1.14 0.12 0.13 † † † †
2 M094001 0.73 -0.40 0.17 † † † †
3 M094101 0.64 2.49 0.26 † † † †
4 M094201 0.71 0.06 0.00 0.27 0.14 -0.41 †
5 M094301 1.01 0.79 0.00 0.64 -0.64 † †
M11 3 M058701 1.21 -0.97 0.19 † † † †
4 M058901 0.87 0.12 0.00 † † † †
6 M059101 1.00 0.15 0.31 † † † †
M12 4 M092401 0.86 -0.15 0.00 1.27 -1.27 † †
8 M092801 1.32 1.34 0.18 † † † †
M13 8 M095301 0.53 1.05 0.00 -0.69 0.69 † †
M14 8 M073901 1.48 1.18 0.00 † † † †
M15 7 M076701 1.84 1.35 0.00 0.00 0.00 † †
8 M076801 1.02 1.45 0.00 -0.32 0.32 † †
† 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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