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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 Main Assessment, by Item and Block: 2009

NAEP Technical DocumentationIRT parameters for items in the reading to gain information scale, grade 4 reading combined national and state main assessment, by item and block: 2009
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), 2009 Reading Assessment.
F6 1 R017301 0.75 -1.17 † † † †
2 R017302 1.57 -0.49 0.28 † † †
3 R017303 0.62 -0.31 † 0.45 -0.45 †
4 R017304 1.15 -0.02 0.28 † † †
5 R017310 0.55 -0.29 † -0.67 0.67 †
6 R017306 1.04 -0.66 0.29 † † †
7 R017307 0.67 0.93 † 1.75 -0.44 -1.31
8 R017308 1.04 -0.41 0.21 † † †
9 R017309 0.66 -0.74 † † † †
F7 1 R034501 1.08 0.57 0.28 † † †
2 R034601 0.37 -0.17 † -0.89 0.89 †
3 R034701 0.33 -0.56 0.11 † † †
4 R034801 1.26 -0.68 0.26 † † †
5 R034901 0.57 0.86 † 0.92 -0.92 †
6 R035001 0.57 0.12 † 0.32 -0.32 †
7 R035101 0.77 0.91 0.18 † † †
8 R035201 1.22 0.80 † † † †
9 R035301 0.54 1.03 † 1.21 -0.18 -1.03
10 R035401 0.88 -0.11 0.46 † † †
F8 1 R054601 0.87 -0.19 0.34 † † †
2 R054701 1.44 -0.80 0.50 † † †
3 R054801 0.90 -0.18 † -0.11 0.11 †
4 R054901 1.38 -0.17 0.32 † † †
5 R055001 1.73 0.11 0.21 † † †
6 R057501 1.14 0.35 0.21 † † †
7 R055101 0.59 0.25 † 0.17 0.57 -0.74
8 R055201 1.24 -0.71 0.32 † † †
9 R055301 0.58 0.89 † 0.57 -0.57 †
10 R055401 0.50 0.91 † 0.15 -0.15 †
F10 1 R053101 0.61 -1.65 † † † †
2 R053102 1.47 -0.02 0.34 † † †
3 R053103 1.64 -0.27 0.22 † † †
4 R053104 0.61 -0.37 0.19 † † †
5 R053105 0.89 -0.07 † 0.70 -0.70 †
6 R053106 0.49 0.33 † 0.07 0.08 -0.15
7 R053107 1.15 -0.75 0.23 † † †
8 R053108 0.45 -0.53 † -0.59 0.59 †
9 R053109 1.49 0.16 0.29 † † †
10 R053110 1.04 1.12 0.35 † † †
F12 1 R023301 0.88 -0.96 0.19 † † †
2 R022401 1.29 -0.79 0.46 † † †
3 R023501 0.45 -0.17 † 0.07 -0.07 †
4 R023601 0.77 -1.04 † † † †
5 R023801 1.09 -0.14 0.32 † † †
6 R022901 1.36 -0.39 0.22 † † †
7 R024001 0.59 0.73 † 0.84 -0.84 †
8 R023101 1.42 -0.17 0.21 † † †
9 R024101 1.21 0.27 0.24 † † †
10 R023201 0.55 0.29 † † † †
R4 1 R058201 0.41 -0.54 0.15 † † †
2 R058202 0.53 -0.38 0.21 † † †
3 R058207 0.76 -0.56 † 0.38 -0.38 †
4 R058203 0.50 1.39 0.30 † † †
5 R058204 0.62 0.40 † 0.27 -0.27 †
6 R058205 0.84 -0.61 0.22 † † †
7 R058206 0.51 0.49 † 0.78 1.66 -2.44
8 R058208 1.46 -0.50 0.25 † † †
9 R058209 0.42 -1.81 † † † †
10 R058210 1.41 0.43 0.19 † † †
R7 1 R058801 1.53 -0.15 0.38 † † †
2 R058802 1.09 -0.44 0.26 † † †
3 R058803 2.50 0.09 0.35 † † †
4 R058804 1.19 0.08 0.24 † † †
5 R058805 0.34 -0.33 † 1.46 -1.46 †
6 R058806 0.83 0.91 0.24 † † †
7 R058807 0.38 0.15 † 0.53 0.93 -1.45
8 R058808 1.27 0.82 0.25 † † †
9 R058809 1.09 0.32 0.28 † † †
10 R058810 0.39 0.55 † 0.97 -0.97 †
R8 1 R059101 0.57 -0.17 0.17 † † †
2 R059102 0.89 -0.76 0.15 † † †
3 R059103 0.99 0.56 0.13 † † †
4 R059104 1.55 -0.58 0.28 † † †
5 R059109 0.52 0.95 † 0.58 -0.58 †
6 R059106 0.45 1.71 † 1.90 -0.78 -1.12
7 R059105 1.03 0.33 0.20 † † †
8 R059107 0.65 -0.14 0.12 † † †
9 R059108 0.42 0.84 † -0.58 0.58 †
10 R059110 0.70 0.29 † † † †
R9 1 R059401 0.73 -0.78 0.23 † † †
2 R059403 0.38 0.50 † 1.16 -1.16 †
3 R059404 0.83 -0.08 0.20 † † †
4 R059405 0.63 -0.50 0.16 † † †
5 R059406 0.41 -0.05 † 0.83 0.68 -1.51
6 R059407 0.59 0.74 † 0.60 -0.60 †
7 R059408 1.12 -0.76 0.21 † † †
8 R059409 0.28 0.91 † † † †
9 R059410 1.14 0.15 0.26 † † †
R10 1 R059501 1.30 -0.43 0.16 † † †
2 R059502 0.91 -0.51 0.19 † † †
3 R059503 0.90 1.25 0.41 † † †
4 R059504 0.54 1.13 † 0.91 -0.91 †
5 R059506 1.38 -0.30 0.24 † † †
6 R059507 0.45 1.06 † 1.82 1.14 -2.97
7 R059505 1.10 -0.11 0.19 † † †
8 R059509 0.52 0.27 † 0.74 -0.74 †
9 R059508 0.94 2.43 0.24 † † †
10 R059510 0.49 1.10 † 0.72 -0.72 †
Last updated 03 June 2016 (GF)
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