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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 Measurement Scale, by Block and Item, Grade 4 Mathematics National Main Assessment (Accommodations Not Permitted [R2]): 2000
NAEP Technical DocumentationIRT parameters for the measurement scale, by block and item, grade 4 mathematics national main assessment (accommodations not permitted [R2]): 2000
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
M3 2 M039101 0.48 -1.37 0.17 † † † †
4 M039301 0.80 0.67 0.00 † † † †
5 M039401 0.73 -0.36 0.17 † † † †
6 M039501 0.92 -0.22 0.17 † † † †
7 M039601 0.68 0.54 0.08 † † † †
M4 2 M017501 0.70 -1.19 0.15 † † † †
8 M018101 0.79 0.55 0.14 † † † †
M5 1 M066001 0.80 1.13 0.19 † † † †
M6 7 M020301 0.95 1.10 0.00 † † † †
M7 1 M067601 0.65 1.04 0.10 † † † †
M8 8 M010731 1.10 0.61 0.21 † † † †
10 M010931 1.23 1.20 0.26 † † † †
M9 1 M090501 0.95 -0.41 0.15 † † † †
5 M090901 0.55 0.58 0.25 † † † †
8 M091201 0.59 0.51 0.00 -0.34 0.34 † †
9 M091301 0.58 2.12 0.15 † † † †
M10 2 M085601 0.40 2.54 0.17 † † † †
M11 12 M047101 1.50 1.86 0.21 † † † †
13 M047201 0.79 0.82 0.19 † † † †
M12 1 M086401 0.28 1.31 0.22 † † † †
6 M086901 0.56 0.54 0.18 † † † †
M13 2 M042701 1.19 -1.29 0.14 † † † †
3 M042801 0.89 -1.52 0.14 † † † †
M14 3 M072101 0.79 -1.90 0.16 † † † †
M15 1 M074201 0.97 -0.08 0.08 † † † †
2 M074301 0.93 -0.14 0.00 † † † †
7 M074801 0.70 0.34 0.00 0.09 -0.09 † †
† 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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