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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → IRT Parameters for the Reading Assessments → IRT Parameters for Items in the Reading to Gain Information Scale, Grade 4 Reading Combined National and State Assessments, By Item and Block: 2011

NAEP Technical DocumentationIRT parameters for items in the reading to gain information scale, grade 4 reading combined national and state assessments, by item and block: 2011
Block Item NAEP ID aj bj cj dj1 dj2 dj3 
† 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 Reading Assessment.
R4 1 R058201 0.40 -0.80 0.08 † † †
2 R058202 0.52 -0.38 0.22 † † †
3 R058207 0.76 -0.60 † 0.42 -0.42 †
4 R058203 0.51 1.46 0.30 † † †
5 R058204 0.67 0.37 † 0.30 -0.30 †
6 R058205 0.94 -0.50 0.25 † † †
7 R058206 0.53 0.46 † 0.84 1.58 -2.42
8 R058208 1.47 -0.47 0.27 † † †
9 R058209 0.44 -1.82 † † † †
10 R058210 1.40 0.43 0.19 † † †
R7 1 R058801 1.57 -0.11 0.41 † † †
2 R058802 1.08 -0.43 0.27 † † †
3 R058803 2.38 0.05 0.32 † † †
4 R058804 1.21 0.05 0.24 † † †
5 R058805 0.34 -0.28 † 1.30 -1.30 †
6 R058806 0.83 0.86 0.23 † † †
7 R058807 0.40 0.12 † 0.76 0.65 -1.40
8 R058808 1.36 0.82 0.26 † † †
9 R058809 1.06 0.30 0.27 † † †
10 R058810 0.42 0.63 † 1.00 -1.00 †
R8 1 R059101 0.54 -0.24 0.14 † † †
2 R059102 0.88 -0.80 0.14 † † †
3 R059103 0.96 0.59 0.13 † † †
4 R059104 1.62 -0.60 0.27 † † †
5 R059109 0.53 0.97 † 0.66 -0.66 †
6 R059106 0.46 1.54 † 1.85 -0.92 -0.93
7 R059105 1.04 0.33 0.21 † † †
8 R059107 0.67 -0.17 0.11 † † †
9 R059108 0.43 0.92 † -0.45 0.45 †
10 R059110 0.66 0.23 † † † †
R9 1 R058301 0.49 -0.89 0.26 † † †
2 R058302 1.07 -0.40 † † † †
3 R058303 1.39 0.14 0.21 † † †
4 R058304 0.53 -0.45 † 0.51 -0.51 †
5 R058311 1.69 -0.11 0.35 † † †
6 R058306 1.89 0.91 0.33 † † †
7 R058307 0.62 0.41 † 0.74 -0.75 0.01
8 R058308 1.79 0.34 0.20 † † †
9 R058309 1.59 0.07 0.18 † † †
R10 1 R059501 1.28 -0.40 0.14 † † †
2 R059502 1.01 -0.34 0.22 † † †
3 R059503 1.19 1.22 0.44 † † †
4 R059504 0.58 1.08 † 0.90 -0.90 †
5 R059506 1.44 -0.24 0.26 † † †
6 R059507 0.48 0.92 † 1.82 0.84 -2.66
7 R059505 1.19 -0.01 0.22 † † †
8 R059509 0.53 0.32 † 0.72 -0.72 †
9 R059508 1.14 2.11 0.25 † † †
10 R059510 0.51 1.11 † 0.69 -0.69 †
Last updated 01 July 2014 (GF)
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