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 12 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. |
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| R1 | 2 | R059602 | 0.81 | -0.02 | 0.21 | † | † | † | † | † |
| 8 | R059608 | 0.98 | -0.22 | 0.20 | † | † | † | † | † | |
| R2 | 2 | R059802 | 0.37 | 2.61 | 0.19 | † | † | † | † | † |
| 4 | R059804 | 0.99 | -0.67 | 0.25 | † | † | † | † | † | |
| R3 | 2 | R060102 | 0.92 | -0.25 | 0.22 | † | † | † | † | † |
| 9 | R060109 | 1.25 | 0.46 | 0.18 | † | † | † | † | † | |
| R4 | 2 | R060302 | 1.30 | -0.30 | 0.27 | † | † | † | † | † |
| 8 | R060308 | 1.03 | 0.55 | 0.23 | † | † | † | † | † | |
| R5 | 1 | R061601 | 1.38 | -0.37 | 0.22 | † | † | † | † | † |
| 3 | R061603 | 1.32 | -0.67 | 0.23 | † | † | † | † | † | |
| R6 | 2 | R061902 | 0.88 | 0.45 | 0.28 | † | † | † | † | † |
| 8 | R061907 | 1.73 | 1.03 | 0.16 | † | † | † | † | † | |
| R7 | 4 | R062204 | 0.69 | -0.57 | 0.23 | † | † | † | † | † |
| 8 | R062208 | 0.62 | 0.08 | 0.20 | † | † | † | † | † | |
| R8 | 5 | R062305 | 1.52 | 0.22 | 0.29 | † | † | † | † | † |
| 9 | R062310 | 1.17 | 0.49 | 0.20 | † | † | † | † | † | |
| R9 | 3 | R062511 | 1.99 | 0.46 | 0.25 | † | † | † | † | † |
| 9 | R062510 | 0.98 | 0.56 | 0.27 | † | † | † | † | † | |
| R10 | 3 | R062703 | 0.63 | -0.10 | 0.25 | † | † | † | † | † |
| 9 | R062709 | 1.20 | 0.96 | 0.34 | † | † | † | † | † | |
| R11 | 4 | R062904 | 0.53 | -0.07 | 0.20 | † | † | † | † | † |
| 5 | R062905 | 1.01 | 0.70 | 0.26 | † | † | † | † | † | |
| R12 | 2 | R063103 | 2.31 | 0.63 | 0.22 | † | † | † | † | † |
| 6 | R063106 | 1.15 | 0.10 | 0.37 | † | † | † | † | † | |
| R13 | 6 | R063206 | 1.42 | -0.14 | 0.31 | † | † | † | † | † |
| 9 | R063209 | 1.78 | -0.08 | 0.30 | † | † | † | † | † | |
| R14 | 1 | R0V0401 | 2.80 | 0.76 | 0.29 | † | † | † | † | † |
| 2 | R0V0402 | 1.11 | -0.77 | 0.17 | † | † | † | † | † | |
| 3 | R0V0403 | 0.74 | 0.12 | 0.18 | † | † | † | † | † | |
| 4 | R0V0404 | 0.65 | 0.76 | 0.26 | † | † | † | † | † | |
| 5 | R0V0405 | 0.99 | 0.64 | 0.23 | † | † | † | † | † | |
| 6 | R0V0406 | 1.15 | 0.82 | 0.31 | † | † | † | † | † | |
| R15 | 1 | R0V0506 | 1.22 | -0.07 | 0.14 | † | † | † | † | † |
| 2 | R0V0507 | 0.75 | 1.20 | 0.24 | † | † | † | † | † | |
| 3 | R0V0508 | 0.94 | -0.61 | 0.14 | † | † | † | † | † | |
| 4 | R0V0509 | 1.04 | 0.46 | 0.31 | † | † | † | † | † | |
| 5 | R0V0510 | 1.93 | 0.51 | 0.21 | † | † | † | † | † | |
| R16 | 1 | R0V0801 | 0.98 | -0.35 | 0.21 | † | † | † | † | † |
| 2 | R0V0802 | 1.03 | 1.28 | 0.27 | † | † | † | † | † | |
| 3 | R0V0803 | 1.36 | 0.91 | 0.22 | † | † | † | † | † | |
| 4 | R0V0804 | 1.45 | 0.17 | 0.24 | † | † | † | † | † | |
| 5 | R0V0805 | 1.98 | 1.51 | 0.19 | † | † | † | † | † | |
| R17 | 1 | R0V1001 | 0.77 | -0.18 | 0.20 | † | † | † | † | † |
| 2 | R0V1002 | 2.20 | 0.94 | 0.15 | † | † | † | † | † | |
| 3 | R0V1003 | 1.29 | 0.43 | 0.12 | † | † | † | † | † | |
| 4 | R0V1004 | 0.76 | -0.25 | 0.21 | † | † | † | † | † | |
| 5 | R0V1005 | 1.57 | 1.07 | 0.26 | † | † | † | † | † | |
Last updated 03 June 2016 (GF)