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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment Item Response Theory Parameters → Reading Assessment Item Response Theory Parameters → IRT Parameters for the Reading to Gain Information Scale, by Block and Item, Grade 4 Reading Combined National and State Main Assessment: 2003
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 |
|---|---|---|---|---|---|---|---|---|
|
† Not applicable; c parameters are not estimated for generalized partial credit models.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2003 Reading Assessment.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 is 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. |
||||||||
| R6 | 1 | R017301 | 0.76 | -1.00 | 0.00 | † | † | † |
| 2 | R017302 | 1.44 | -0.44 | 0.25 | † | † | † | |
| 3 | R017303 | 0.71 | -0.12 | † | 0 | -0.43 | † | |
| 4 | R017304 | 1.11 | -0.12 | 0.26 | † | † | † | |
| 5 | R017310 | 0.60 | -0.14 | † | -0 | 0.15 | † | |
| 6 | R017306 | 0.99 | -0.50 | 0.24 | † | † | † | |
| 7 | R017307 | 0.67 | 0.92 | † | 1 | -0.29 | -1.14 | |
| 8 | R017308 | 1.06 | -0.34 | 0.23 | † | † | † | |
| 9 | R017309 | 0.70 | -0.65 | 0.00 | † | † | † | |
| R7 | 1 | R012701 | 1.07 | -0.23 | 0.32 | † | † | † |
| 2 | R012702 | 0.57 | -1.28 | 0.00 | † | † | † | |
| 3 | R012703 | 1.09 | 0.65 | 0.00 | † | † | † | |
| 4 | R012704 | 1.25 | 0.66 | 0.13 | † | † | † | |
| 5 | R012705 | 1.20 | 1.28 | 0.00 | † | † | † | |
| 6 | R012706 | 0.56 | 1.50 | 0.00 | † | † | † | |
| 7 | R012707 | 2.17 | 0.20 | 0.27 | † | † | † | |
| 8 | R012714 | 0.64 | 1.75 | † | 1 | 0.70 | -2.04 | |
| 9 | R012709 | 0.62 | -0.13 | 0.31 | † | † | † | |
| 10 | R012710 | 0.90 | 0.75 | 0.00 | † | † | † | |
| R8 | 1 | R017401 | 0.44 | -1.31 | † | 0 | -0.44 | † |
| 2 | R017501 | 0.72 | 0.12 | 0.33 | † | † | † | |
| 3 | R017601 | 1.75 | 0.03 | 0.23 | † | † | † | |
| 4 | R017701 | 0.38 | 1.21 | † | 0 | -0.37 | † | |
| 5 | R017801 | 1.14 | 0.50 | 0.20 | † | † | † | |
| 6 | R017901 | 0.58 | 1.46 | † | 0 | -0.41 | † | |
| 7 | R018001 | 1.53 | -0.17 | 0.30 | † | † | † | |
| 8 | R018101 | 1.67 | -0.11 | 0.20 | † | † | † | |
| 9 | R018201 | 0.44 | 0.64 | † | 0 | -0.72 | † | |
| 10 | R018301 | 0.56 | -0.50 | † | -0 | 0.04 | † | |
| R10 | 1 | R012501 | 0.62 | 3.07 | 0.32 | † | † | † |
| 2 | R012502 | 0.92 | -2.22 | 0.16 | † | † | † | |
| 3 | R012503 | 0.96 | -0.08 | 0.00 | † | † | † | |
| 4 | R012504 | 0.69 | -0.45 | 0.00 | † | † | † | |
| 5 | R012505 | 1.19 | -0.94 | 0.24 | † | † | † | |
| 6 | R012506 | 0.71 | -0.27 | 0.00 | † | † | † | |
| 7 | R012507 | 1.30 | -0.80 | 0.34 | † | † | † | |
| 8 | R012508 | 0.92 | -0.52 | 0.00 | † | † | † | |
| 9 | R012509 | 0.60 | -1.04 | 0.16 | † | † | † | |
| 10 | R012510 | 0.89 | -0.59 | 0.28 | † | † | † | |
| 11 | R012511 | 0.89 | -0.58 | 0.00 | † | † | † | |
| 12 | R012512 | 0.39 | 0.59 | † | 0 | 0.39 | -1.31 | |
| R12 | 1 | R023301 | 0.95 | -0.95 | 0.17 | † | † | † |
| 2 | R022401 | 1.07 | -0.95 | 0.33 | † | † | † | |
| 3 | R023501 | 0.44 | 0.17 | † | -0 | 0.09 | † | |
| 4 | R023601 | 0.76 | -0.90 | 0.00 | † | † | † | |
| 5 | R023801 | 1.13 | 0.17 | 0.31 | † | † | † | |
| 6 | R022901 | 1.34 | -0.24 | 0.21 | † | † | † | |
| 7 | R024001 | 0.58 | 1.00 | † | 0 | -0.75 | † | |
| 8 | R023101 | 1.25 | -0.05 | 0.16 | † | † | † | |
| 9 | R024101 | 1.39 | 0.36 | 0.26 | † | † | † | |
| 10 | R023201 | 0.50 | 0.51 | 0.00 | † | † | † | |
Last updated 16 February 2009 (GF)
