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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 Number Sense,Properties, and Operations Scale, by Block and Item, Grade 12 Mathematics National Main Assessment (Accommodations Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the number sense, properties, and operations 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 8 M056501 1.68 1.25 0.23 † † † †
9 M056601 0.81 0.74 0.07 † † † †
10 M056801 1.70 0.89 0.00 † † † †
14 M057101 2.11 1.86 0.00 † † † †
M4 1 M017401 0.32 -4.34 0.18 † † † †
4 M017701 0.96 -1.74 0.13 † † † †
6 M017901 1.21 -1.67 0.16 † † † †
9 M018201 0.58 -1.82 0.14 † † † †
11 M018401 1.18 -1.58 0.17 † † † †
12 M018501 1.39 -0.16 0.25 † † † †
13 M018601 0.46 0.49 0.11 † † † †
M5 8 M071201 0.41 0.94 0.00 -1.26 1.26 † †
10 M071401 0.51 1.69 0.00 -1.09 1.09 † †
M6 1 M021401 0.95 -0.15 0.00 † † † †
9 M020501 0.87 -1.05 0.00 † † † †
15 M021701 1.21 0.35 0.00 † † † †
M7 3 M071503 0.93 0.28 0.21 † † † †
M8 3 M012431 0.54 -2.19 0.13 † † † †
4 M012531 0.65 -0.45 0.12 † † † †
8 M012931 1.21 0.19 0.21 † † † †
12 N202831 0.79 -2.31 0.17 † † † †
15 M011531 2.37 0.98 0.08 † † † †
M9 2 M052401 0.50 -0.01 0.00 † † † †
M10 7 M094501 0.91 0.22 0.16 † † † †
M11 2 M058601 1.11 -0.48 0.12 † † † †
5 M059001 0.81 0.17 0.09 † † † †
7 M059201 0.73 -1.09 0.15 † † † †
11 M059601 1.38 1.06 0.08 † † † †
M13 4 M094901 1.23 -0.38 0.14 † † † †
5 M095001 0.72 -0.25 0.00 -0.36 0.36 † †
M14 1 M073701 0.94 -0.04 0.23 † † † †
3 M073001 0.89 -1.17 0.20 † † † †
4 M073101 0.54 0.08 0.23 † † † †
7 M073401 0.70 0.66 0.00 -0.12 0.12 † †
9 M074001 0.97 0.40 0.00 0.45 -0.45 † †
M15 1 M076101 0.47 -1.99 0.00 0.92 -0.92 † †
2 M076201 0.52 -0.37 0.17 † † † †
† 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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