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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 for Literary Experience Scale, Grade 4 Reading Combined National and State Assessments, By Item and Block: 2011

NAEP Technical DocumentationIRT parameters for items in the reading for literary experience 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.
R1 1 R057701 0.57 0.37 0.28 † † †
2 R057702 0.65 -1.75 0.08 † † †
3 R057703 1.35 -1.36 0.29 † † †
4 R057704 0.68 -0.56 † † † †
5 R057705 0.50 -0.53 † 0.71 -0.71 †
6 R057706 0.65 -0.23 † 0.87 -0.87 †
7 R057707 0.51 0.77 † 0.81 -0.05 -0.76
8 R057708 0.82 0.02 0.15 † † †
9 R057709 0.62 -1.14 0.17 † † †
10 R057710 0.63 0.04 † 1.05 -1.05 †
11 R057711 1.15 0.65 0.18 † † †
R2 1 R057801 1.22 -0.95 0.39 † † †
2 R057802 1.15 -0.20 0.28 † † †
4 R057804 0.89 -0.66 0.25 † † †
5 R057805 0.53 -0.43 0.17 † † †
6 R057806 0.51 0.33 † 2.06 0.22 -2.28
7 R057807 0.76 -1.16 † † † †
8 R057808 0.91 0.77 0.25 † † †
9 R057809 0.55 0.34 † 1.62 -1.62 †
R3 1 R068701 0.97 -0.21 0.29 † † †
2 R068702 0.54 -1.54 0.25 † † †
3 R068703 1.36 -0.57 0.22 † † †
4 R068704 0.43 -1.15 † 0.37 -0.37 †
5 R068705 0.79 -1.66 0.22 † † †
6 R068706 1.01 -1.21 0.26 † † †
7 R068707 0.52 1.01 † 1.29 0.18 -1.47
8 R068708 0.37 -0.15 † -0.31 0.31 †
9 R068709 0.64 1.47 0.29 † † †
10 R068710 1.04 0.82 0.24 † † †
11 R068711 0.45 0.39 † -0.81 0.81 †
R5 1 R058501 1.15 0.20 0.17 † † †
2 R058502 1.34 0.57 0.27 † † †
3 R058503 1.08 0.61 0.25 † † †
4 R058504 0.50 0.21 † 1.48 -1.48 †
5 R058505 1.25 0.87 0.14 † † †
6 R058506 0.84 0.18 0.25 † † †
7 R058507 0.94 0.52 0.23 † † †
8 R058508 0.54 0.42 † 0.68 0.37 -1.04
9 R058509 0.66 0.85 † † † †
10 R058510 0.83 0.20 0.23 † † †
R6 1 R058601 1.04 -0.06 0.16 † † †
2 R058602 0.56 0.67 † 0.65 -0.65 †
3 R058603 1.06 -0.07 0.35 † † †
4 R058604 1.24 0.15 0.24 † † †
5 R058605 1.18 0.56 0.19 † † †
6 R058606 0.58 1.06 † 0.44 -0.44 †
7 R058607 1.33 0.26 0.32 † † †
8 R058608 0.60 1.08 † 1.50 -0.54 -0.96
9 R058609 0.88 0.39 0.15 † † †
10 R058610 1.40 0.12 0.27 † † †
Last updated 01 July 2014 (GF)
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