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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → IRT Parameters for the Mathematics Assessments → IRT Parameters for Items in the Data Analysis, Statistics, and Probability Scale, Grade 4 Mathematics Combined National and State Assessments, By Item and Block: 2011

NAEP Technical DocumentationIRT parameters for the data analysis, statistics, and probability scale, grade 4 mathematics combined national and state assessments, by item and block: 2011
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), 2011 Mathematics Assessment.
MD 7 M147301 0.69 -1.30 0.18 † † † †
10 M147601 0.58 0.86 0.15 † † † †
12 M147801 1.30 0.35 0.09 † † † †
ME 6 M218701 0.93 -1.02 0.12 † † † †
7 M218801 1.03 -0.57 † † † † †
MF 14 M136901 0.71 0.33 † 0.01 -0.01 † †
15 M137001 0.60 0.68 0.23 † † † †
MG 2 M170001 0.57 -1.15 0.13 † † † †
9 M157201 0.76 0.24 0.11 † † † †
MH 6 M072301 0.56 -1.44 0.10 † † † †
13 M040001 0.79 -0.13 † † † † †
MI 6 M155401 0.77 -1.18 0.04 † † † †
15 M160901 0.54 1.81 † -1.35 1.35 † †
MJ 7 M220301 0.74 -0.59 0.04 † † † †
10 M220601 0.42 1.19 0.08 † † † †
MK 12 M154901 0.05 5.65 0.23 † † † †
14 M162301 0.73 0.66 0.08 † † † †
ML 2 M148301 0.65 -1.43 0.12 † † † †
4 M148501 0.60 -0.36 † -0.26 0.26 † †
5 M148601 0.97 0.32 0.25 † † † †
Last updated 30 June 2014 (GF)
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