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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 the Reading Vocabulary Scale, Grade 8 Reading Vocabulary Combined National and State Assessments, By Item and Block: 2011
NAEP Technical DocumentationIRT parameters for the reading vocabulary scale, grade 8 reading vocabulary combined national and state assessments, by item and block: 2011
Block1 Item NAEP ID aj bj cj dj1 dj2 dj3  dj4  dj5 
1 The table includes reading vocabulary items from both the half-blocks as well as the reading vocabulary items embedded within the 25-minute reading comprehension blocks.
† 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 Vocabulary Assessment.
R1 2 R059602 0.53 -0.50 0.12 † † † † †
8 R059608 0.69 -0.57 0.15 † † † † †
R2 2 R059802 0.26 2.56 0.14 † † † † †
4 R059804 0.72 -1.21 0.16 † † † † †
R3 2 R060102 0.71 -0.49 0.20 † † † † †
9 R060109 0.62 0.66 0.13 † † † † †
R4 2 R060302 0.82 -0.72 0.16 † † † † †
8 R060308 0.71 0.65 0.22 † † † † †
R5 2 R058502 1.08 -0.83 0.19 † † † † †
3 R058503 0.78 -1.33 0.11 † † † † †
R6 5 R058605 0.82 -1.01 0.11 † † † † †
10 R058610 1.10 -1.37 0.14 † † † † †
R7 2 R058802 1.48 -1.62 0.19 † † † † †
8 R058808 1.11 -0.73 0.20 † † † † †
R8 2 R059102 1.10 -1.75 0.08 † † † † †
4 R059104 1.55 -1.79 0.10 † † † † †
R9 9 R060510 0.72 -1.62 0.21 † † † † †
10 R060511 0.94 -1.17 0.16 † † † † †
R11 5 R060806 1.20 -1.03 0.20 † † † † †
8 R060802 0.31 0.52 0.27 † † † † †
R12 8 R061008 1.15 -0.24 0.18 † † † † †
9 R061009 1.42 -1.03 0.19 † † † † †
R13 5 R061305 0.93 -1.59 0.12 † † † † †
6 R061306 0.90 -0.85 0.09 † † † † †
R14 1 R0V0401 1.30 1.15 0.23 † † † † †
2 R0V0402 1.26 -1.04 0.18 † † † † †
3 R0V0403 0.86 0.37 0.23 † † † † †
4 R0V0404 0.55 0.46 0.22 † † † † †
5 R0V0405 0.68 0.41 0.13 † † † † †
6 R0V0406 0.77 1.06 0.28 † † † † †
R15 1 R0V0506 1.14 -0.20 0.16 † † † † †
2 R0V0507 0.75 0.61 0.21 † † † † †
3 R0V0508 0.90 -0.90 0.10 † † † † †
4 R0V0509 0.40 -0.66 0.14 † † † † †
5 R0V0510 1.63 0.87 0.19 † † † † †
R16 1 R0V0206 1.36 -1.53 0.13 † † † † †
2 R0V0207 2.01 -1.51 0.16 † † † † †
3 R0V0208 1.90 -1.47 0.13 † † † † †
4 R0V0209 1.50 -1.24 0.14 † † † † †
5 R0V0210 2.22 -1.30 0.11 † † † † †
R17 1 R0V0306 1.56 -1.18 0.13 † † † † †
2 R0V0307 1.62 -1.16 0.15 † † † † †
3 R0V0308 0.37 -0.10 0.22 † † † † †
4 R0V0309 1.51 -1.02 0.18 † † † † †
5 R0V0310 0.97 -0.71 0.08 † † † † †
R18 1 R0V1301 1.26 -1.53 0.17 † † † † †
2 R0V1302 0.67 -0.20 0.24 † † † † †
3 R0V1303 0.69 0.47 0.19 † † † † †
4 R0V1304 1.24 -1.36 0.20 † † † † †
5 R0V1305 0.74 -0.12 0.18 † † † † †
6 R0V1306 0.76 -0.74 0.18 † † † † †
R19 1 R0V0708 0.89 -0.74 0.27 † † † † †
2 R0V0709 0.75 -1.63 0.15 † † † † †
3 R0V0710 1.12 0.19 0.23 † † † † †
4 R0V0711 0.90 -0.19 0.21 † † † † †
5 R0V0713 1.75 -1.79 0.14 † † † † †
Last updated 01 July 2014 (GF)
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