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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 Measurement Scale, Grade 4 Mathematics Combined National and State Assessments, By Item and Block: 2011

NAEP Technical DocumentationIRT parameters in the measurement 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.
MC 6 M145701 1.25 -0.12 0.16 † † † †
8 M145901 0.50 0.44 † -0.92 0.92 † †
10 M146101 1.19 0.46 † † † † †
13 M146401 0.75 0.98 † 0.48 -0.48 † †
14 M146501 1.14 0.85 0.03 † † † †
MD 5 M147101 1.46 0.83 0.14 † † † †
ME 5 M218601 0.64 -1.40 0.11 † † † †
9 M219001 0.51 -2.08 0.16 † † † †
13 M219401 0.70 -2.10 0.15 † † † †
MF 1 M135601 0.79 -1.65 0.17 † † † †
8 M136301 0.67 -0.23 0.19 † † † †
11 M136601 0.73 0.16 † 0.25 -0.25 † †
13 M136801 0.88 0.43 0.15 † † † †
MG 1 M154501 0.48 -3.05 0.18 † † † †
14 M157701 0.77 2.59 0.17 † † † †
MH 3 M039101 0.49 -1.74 0.20 † † † †
9 M086901 0.87 0.85 0.34 † † † †
10 M090901 1.26 1.03 0.40 † † † †
15 M091201 0.57 0.42 † -0.46 0.46 † †
16 M066001 1.14 0.81 0.20 † † † †
18 M091301 1.33 1.67 0.26 † † † †
MI 1 M157901 0.75 -2.24 0.15 † † † †
7 M158701 1.20 1.19 0.07 † † † †
11 M160301 0.55 0.85 0.10 † † † †
MJ 3 M219901 0.73 0.60 0.32 † † † †
8 M220401 0.56 1.05 † -4.05 4.05 † †
15 M221101 0.86 0.48 † 0.25 -0.25 † †
MK 2 M156301 0.53 -2.29 0.14 † † † †
7 M158301 1.03 0.66 0.23 † † † †
11 M161901 0.40 -1.28 † 0.46 -0.46 † †
ML 1 M148201 0.86 -2.10 0.15 † † † †
8 M148901 0.88 -0.34 0.16 † † † †
Last updated 30 June 2014 (GF)
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