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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT parameters for Items in the Measurement Scale, Grade 4 Mathematics Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the measurement scale, grade 4 mathematics combined national and state main assessment, by item and block: 2007
Block Item NAEP ID aj bj cj dj1 dj2
† Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models.
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 represents the category threshold parameter for category i. The c parameter value is exactly zero for items scaled with the two-parameter logistic model. For item j, dji may not sum to zero because of rounding.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007 Mathematics Assessment.
M3 6 M145701 1.23 -0.09 0.18 † †
8 M145901 0.48 0.46 † -0.97 0.97
10 M146101 1.10 0.44 † † †
13 M146401 0.73 0.96 † 0.47 -0.47
14 M146501 1.28 0.91 0.05 † †
M4 5 M147101 1.65 0.90 0.16 † †
M5 5 M085601 1.09 1.27 0.26 † †
13 M047101 1.77 1.35 0.18 † †
M6 1 M135601 0.83 -1.38 0.29 † †
8 M136301 0.73 -0.12 0.24 † †
11 M136601 0.68 0.17 † 0.23 -0.23
13 M136801 1.04 0.51 0.17 † †
M7 3 M139001 0.71 -1.01 0.22 † †
5 M139201 0.79 0.32 0.39 † †
8 M139501 0.41 0.56 0.15 † †
13 M140001 0.73 1.25 † 0.56 -0.56
M8 3 M039101 0.45 -1.73 0.24 † †
9 M086901 0.89 0.82 0.34 † †
10 M090901 1.37 1.08 0.40 † †
15 M091201 0.62 0.49 † -0.37 0.37
16 M066001 1.06 0.73 0.17 † †
18 M091301 1.32 1.65 0.24 † †
M9 1 M042801 0.75 -1.71 0.29 † †
7 M039501 0.72 -0.46 0.08 † †
12 M067601 0.65 0.88 0.12 † †
19 M039601 0.75 0.68 0.21 † †
M10 3 M137401 1.10 -0.24 0.18 † †
6 M137701 0.77 0.14 0.44 † †
9 M138001 0.76 0.04 0.32 † †
14 M138501 1.31 1.24 0.20 † †
M11 1 M095701 0.56 -0.78 0.28 † †
10 M096801 0.55 1.30 0.13 † †
14 M097201 0.76 -0.03 † -0.12 0.12
M12 1 M148201 0.79 -2.10 0.22 † †
8 M148901 0.86 -0.22 0.20 † †
Last updated 08 January 2010 (JL)

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