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HomeTDWNAEP Analysis and ScalingEstimation of NAEP Score ScalesNAEP Assessment IRT ParametersMathematics Assessment IRT ParametersIRT Parameters for the Geometry and Spatial Sense Scale, by Block and Item, Grade 4 Mathematics State Assessment (Accommodations Not Permitted [R2]): 2000
NAEP Technical DocumentationIRT parameters for the geometry and spatial sense scale, by block and item, grade 4 mathematics state assessment (accommodations not permitted [R2]): 2000
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
M3 9 M039801 1.11 1.70 0.37 † † † †
M4 3 M017601 0.34 -0.49 0.32 † † † †
7 M018001 0.96 1.36 0.21 † † † †
M6 11A M020701 0.76 0.88 0.00 † † † †
2A M019801 0.82 1.47 0.00 † † † †
3A M019901 0.61 -0.84 0.00 † † † †
M7 7A M068003 1.11 0.94 0.00 † † † †
8A M068004 0.23 1.66 0.00 -1.24 1.71 -0.77 0.30
M8 15A M011231 1.56 1.89 0.27 † † † †
1A N214331 0.81 -2.04 0.28 † † † †
M10 1 M085201 0.76 -0.58 0.23 † † † †
4 M085301 0.89 0.01 0.26 † † † †
3A M085701 0.61 -0.17 0.00 0.67 -0.67 † †
5A M085901 0.50 2.13 0.00 † † † †
6A M085401 0.67 1.43 0.00 0.79 -0.28 0.42 -0.93
M11 2 M046101 0.79 -0.98 0.26 † † † †
3 M046201 1.12 0.50 0.20 † † † †
5 M046401 0.95 0.36 0.23 † † † †
8 M046701 0.72 1.24 0.20 † † † †
15 M047401 0.79 -2.08 0.21 † † † †
M13 9,10,11 M0434CL 0.71 1.14 0.00 0.30 0.78 -1.08 †
M15 4A M074501 0.59 0.51 0.00 0.77 -0.77 † †
8A M074901 0.70 0.88 0.00 0.07 -0.07 † †
† 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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