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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 Data Analysis, Statistics, and Probability Scale, by Block and Item, Grade 8 Mathematics National Main Assessment (Accommodations Permitted [R3]): 2000
IRT parameters for the data analysis, statistics, and probability 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 9 M093801 0.20 0.04 0.00 -5.02 4.15 0.86 †
M4 5 M017801 1.04 -0.64 0.25 † † † †
16 M018901 0.55 1.05 0.19 † † † †
M5 2 M067101 0.99 -0.27 0.16 † † † †
11 M067501 0.55 1.34 0.00 0.85 -0.85 † †
M6 6 M020201 0.54 -2.29 0.00 † † † †
10 M020801 0.91 1.56 0.00 † † † †
13 M021101 0.94 -0.01 0.00 † † † †
M8 5 M012631 1.33 0.44 0.23 † † † †
9 M013031 0.97 1.43 0.00 † † † †
10 M013131 0.75 1.22 0.00 † † † †
M9 5 M052701 0.90 0.44 0.14 † † † †
6 M052801 0.60 4.19 0.18 † † † †
9 M053101 0.70 1.19 0.00 0.33 0.09 -0.42 †
M11 7 M046601 1.11 -1.04 0.00 † † † †
11 M047001 1.12 -0.18 0.18 † † † †
14 M047301 1.22 -1.68 0.00 † † † †
17 M047801 1.39 0.75 0.13 † † † †
M12 2 M092201 1.07 0.47 0.13 † † † †
6 M092601 0.73 1.54 0.00 -0.57 0.57 † †
M13 3 M051401 1.06 -1.02 0.12 † † † †
M14 2 M072901 0.48 -0.54 0.00 -0.68 0.68 † †
5 M0732CL 0.34 -0.36 0.00 1.08 -0.07 -1.01 †
8 M073501 0.10 5.79 0.00 † † † †
† 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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