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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 4 Reading Vocabulary National Assessment: 2009
| Block1 | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 | dj5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 The table includes Meaning 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), 2009 Reading Vocabulary Assessment. |
||||||||||
| R1 | 8 | R057708 | 1.29 | -0.74 | 0.19 | † | † | † | † | † |
| 9 | R057709 | 0.87 | -1.54 | 0.25 | † | † | † | † | † | |
| R2 | 2 | R057802 | 1.32 | -1.01 | 0.28 | † | † | † | † | † |
| 8 | R057808 | 1.29 | -0.27 | 0.25 | † | † | † | † | † | |
| R3 | 9 | R058009 | 0.76 | -0.26 | 0.21 | † | † | † | † | † |
| 10 | R058010 | 1.26 | -0.93 | 0.21 | † | † | † | † | † | |
| R4 | 4 | R058203 | 0.72 | 0.21 | 0.31 | † | † | † | † | † |
| 6 | R058205 | 1.01 | -1.27 | 0.26 | † | † | † | † | † | |
| R5 | 2 | R058502 | 1.27 | -0.48 | 0.23 | † | † | † | † | † |
| 3 | R058503 | 1.99 | -0.44 | 0.26 | † | † | † | † | † | |
| R6 | 5 | R058605 | 1.42 | -0.49 | 0.15 | † | † | † | † | † |
| 10 | R058610 | 1.37 | -0.96 | 0.16 | † | † | † | † | † | |
| R7 | 2 | R058802 | 1.70 | -1.15 | 0.26 | † | † | † | † | † |
| 8 | R058808 | 1.94 | -0.33 | 0.23 | † | † | † | † | † | |
| R8 | 2 | R059102 | 1.28 | -1.39 | 0.11 | † | † | † | † | † |
| 4 | R059104 | 1.84 | -1.41 | 0.15 | † | † | † | † | † | |
| R9 | 4 | R059405 | 1.17 | -1.03 | 0.24 | † | † | † | † | † |
| 7 | R059408 | 1.49 | -1.41 | 0.22 | † | † | † | † | † | |
| R10 | 7 | R059505 | 1.54 | -0.96 | 0.17 | † | † | † | † | † |
| 9 | R059508 | 1.40 | 1.14 | 0.25 | † | † | † | † | † | |
| R14 | 1 | R0V0001 | 1.61 | -0.32 | 0.22 | † | † | † | † | † |
| 2 | R0V0002 | 2.26 | -0.50 | 0.15 | † | † | † | † | † | |
| 3 | R0V0003 | 2.92 | -0.54 | 0.31 | † | † | † | † | † | |
| 4 | R0V0004 | 1.99 | -0.77 | 0.31 | † | † | † | † | † | |
| 5 | R0V0005 | 1.84 | -0.87 | 0.18 | † | † | † | † | † | |
| R15 | 1 | R0V0101 | 2.26 | -0.43 | 0.27 | † | † | † | † | † |
| 2 | R0V0102 | 1.45 | -0.12 | 0.30 | † | † | † | † | † | |
| 3 | R0V0103 | 0.91 | -0.39 | 0.13 | † | † | † | † | † | |
| 4 | R0V0104 | 2.11 | -1.18 | 0.19 | † | † | † | † | † | |
| 5 | R0V0105 | 1.69 | -1.03 | 0.20 | † | † | † | † | † | |
| R16 | 1 | R0V0206 | 1.65 | -1.23 | 0.19 | † | † | † | † | † |
| 2 | R0V0207 | 2.28 | -1.15 | 0.18 | † | † | † | † | † | |
| 3 | R0V0208 | 1.93 | -1.28 | 0.18 | † | † | † | † | † | |
| 4 | R0V0209 | 1.96 | -0.74 | 0.26 | † | † | † | † | † | |
| 5 | R0V0210 | 2.32 | -0.95 | 0.25 | † | † | † | † | † | |
| R17 | 1 | R0V0306 | 4.08 | -0.45 | 0.29 | † | † | † | † | † |
| 2 | R0V0307 | 2.38 | -0.77 | 0.15 | † | † | † | † | † | |
| 3 | R0V0308 | 0.43 | -0.10 | 0.21 | † | † | † | † | † | |
| 4 | R0V0309 | 1.84 | -0.77 | 0.18 | † | † | † | † | † | |
| 5 | R0V0310 | 1.63 | -0.24 | 0.21 | † | † | † | † | † | |
Last updated 03 June 2016 (GF)
