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HomeTDWNAEP Analysis and ScalingEstimation of NAEP Score ScalesNAEP Assessment IRT ParametersMathematics Assessment IRT ParametersIRT Parameters for Items in the Number Sense, Properties, and Operations Scale, Grade 8 Mathematics Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the number sense, properties, and operations scale, grade 8 mathematics combined national and state main assessment, by item and block: 2007
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
† 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 5 M150201 1.01 0.73 0.15 † † † †
M4 8 M152001 1.68 0.95 0.11 † † † †
M5 7 M020001 0.66 -0.62 † † † † †
8 M046301 0.93 -1.10 0.26 † † † †
10 M046501 0.88 -0.32 0.34 † † † †
13 M066301 0.31 -1.85 † -3.09 3.09 † †
14 M067901 0.74 -0.71 † -1.29 1.29 † †
16 M051501 0.95 1.18 0.18 † † † †
M6 8 M141101 0.85 -0.76 0.07 † † † †
10 M141301 0.57 0.81 † -1.19 1.19 † †
15 M141801 1.35 0.83 0.19 † † † †
M7 3 M143801 0.88 -0.46 0.13 † † † †
5 M144001 0.76 0.72 0.38 † † † †
7 M144201 0.92 0.21 † † † † †
8 M144301 1.15 0.20 0.14 † † † †
M8 1 M012231 0.52 -3.38 0.16 † † † †
3 M073001 1.26 -0.20 0.15 † † † †
5 M073101 0.97 0.80 0.39 † † † †
14 M012431 0.75 -0.09 0.09 † † † †
15 M091901 0.56 0.11 0.18 † † † †
19 M073601 0.56 1.14 † -0.10 -0.16 -0.06 0.32
M9 1 M013431 0.96 -0.23 0.12 † † † †
6 M091501 1.23 0.46 0.20 † † † †
7 M091601 0.93 0.00 0.21 † † † †
9 M052401 0.69 0.39 † † † † †
12 M013631 1.37 0.19 0.05 † † † †
15 M013531 0.93 0.99 0.11 † † † †
M10 4 M142301 0.88 -0.03 0.33 † † † †
5 M142401 0.89 -0.23 0.30 † † † †
13 M143201 0.94 0.07 † † † † †
M11 1 M105601 0.94 0.14 0.21 † † † †
3 M105901 0.72 -1.54 0.39 † † † †
5 M106101 0.81 -1.16 0.19 † † † †
9 M106501 1.12 -0.37 0.22 † † † †
19 M107601 1.42 0.61 0.06 † † † †
M12 3 M152901 1.21 0.40 0.16 † † † †
13 M153901 0.56 0.69 † -0.03 0.03 † †
Last updated 08 January 2010 (JL)

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