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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 Subscale, Grade 4 Mathematics Combined National and State Assessment, By Item and Block: 2013
NAEP Technical DocumentationIRT parameters for items in the measurement 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 6 M145701 1.23 -0.15 .15 † † † †
8 M145901 0.51 0.42 † -0.87 0.87 † †
10 M146101 1.16 0.47 † † † † †
13 M146401 0.71 1.03 † 0.49 -0.49 † †
14 M146501 1.19 0.84 .04 † † † †
MD 5 M147101 1.34 0.77 .14 † † † †
ME 5 M218601 0.62 -1.47 .09 † † † †
9 M219001 0.51 -2.10 .15 † † † †
13 M219401 0.74 -2.10 .11 † † † †
MF 8 M136301 0.60 -0.41 .13 † † † †
11 M136601 0.70 0.13 † 0.20 -0.20 † †
13 M136801 0.87 0.42 .14 † † † †
MG 1 M154501 0.52 -2.81 .16 † † † †
14 M157701 1.08 2.04 .17 † † † †
MH 3 M230001 0.77 0.35 .27 † † † †
15 M240401 0.85 1.50 † † † † †
MI 1 M226901 1.00 0.82 .25 † † † †
9 M338501 0.71 -0.85 .14 † † † †
MJ 3 M219901 0.70 0.44 .28 † † † †
8 M220401 0.52 0.99 † -4.08 4.08 † †
15 M221101 0.85 0.45 † 0.26 -0.26 † †
MK 2 M156301 0.54 -2.26 .13 † † † †
7 M158301 1.18 0.68 .23 † † † †
11 M161901 0.37 -1.37 † 0.42 -0.42 † †
ML 4 M339101 0.59 0.82 .13 † † † †
10 M339201 0.95 0.00 .16 † † † †
Last updated 21 May 2017 (DC)
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