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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 Algebra Subscale, Grade 4 Mathematics Combined National and State Assessment, By Item and Block: 2013
NAEP Technical DocumentationIRT parameters for items in the algebra subscale, grade 4 mathematics combined national and state assessment, by item and block: 2013
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
† Not applicable; c parameters are not estimated for the two-parameter logistic model or 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 assumed to be exactly zero and is not estimated 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), 2013 Mathematics Assessment.
MC 11 M146201 1.12 1.15 .16 † † † †
15 M146601 0.41 0.23 † -0.33 0.98 -0.47 -0.17
MD 2 M146801 0.50 -0.70 † † † † †
ME 8 M218901 0.56 -2.68 † † † † †
12 M219301 0.84 0.79 .33 † † † †
MF 4 M135901 0.76 -0.86 .14 † † † †
10 M136501 0.93 -0.30 † † † † †
16 M137101 0.97 1.45 .16 † † † †
MG 5 M160201 1.42 0.30 .23 † † † †
8 M157001 0.48 -1.11 † 0.58 -0.58 † †
15 M159401 0.73 0.96 † -0.43 -0.20 0.64 †
MH 5 M240601 0.52 -1.80 † † † † †
13 M2311CL 0.73 0.45 † 0.06 0.43 -0.49 †
MI 4 M227601 0.68 -0.75 .17 † † † †
12 M226801 0.92 0.19 † † † † †
MJ 1 M219701 0.88 -1.98 .09 † † † †
4 M220001 0.42 -1.98 † -1.90 1.90 † †
MK 5 M156601 0.87 0.40 .18 † † † †
9 M156201 0.32 -0.33 .16 † † † †
16 M1610CL 0.21 1.07 † -0.82 -1.60 -0.89 3.31
ML 5 M229201 0.89 -0.58 .19 † † † †
8 M228801 2.02 1.10 .43 † † † †
Last updated 21 May 2017 (DC)
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