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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 Data Analysis, Statistics, and Probability Subscale, Grade 4 Mathematics Combined National and State Assessment, By Item and Block: 2013
NAEP Technical DocumentationIRT parameters for items in the data analysis, statistics, and probability 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.
MD 7 M147301 0.75 -1.05 .24 † † † †
10 M147601 0.65 0.99 .17 † † † †
12 M147801 1.27 0.38 .09 † † † †
ME 6 M218701 0.95 -0.97 .15 † † † †
7 M218801 1.09 -0.56 † † † † †
MF 14 M136901 0.70 0.29 † 0.02 -0.02 † †
15 M137001 0.73 0.77 .28 † † † †
MG 2 M170001 0.61 -1.04 .14 † † † †
9 M157201 0.81 0.15 .10 † † † †
MH 2 M240301 0.55 -3.21 .17 † † † †
6 M230501 1.26 0.56 .41 † † † †
10 M231001 1.07 0.60 .33 † † † †
MI 6 M338401 0.28 -1.91 † -2.79 2.79 † †
10 M225001 0.77 0.27 † 1.00 -1.00 † †
MJ 7 M220301 0.75 -0.58 .04 † † † †
10 M220601 0.45 1.25 .09 † † † †
MK 12 M154901 0.03 4.16 .10 † † † †
14 M162301 0.79 0.65 .10 † † † †
ML 7 M225201 0.63 -0.44 † -3.29 3.29 † †
Last updated 21 May 2017 (DC)
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