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Table of Contents | Search Technical Documentation | References
NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment Item Response Theory Parameters → Writing Assessment Item Response Theory Parameters → IRT Parameters for the Writing Scale, by Block and Item, Grade 4 Writing Combined National and State Main Assessment: 2002
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 | dj5 |
|---|---|---|---|---|---|---|---|---|---|---|
| † Not applicable; c parameters are not estimated for generalized partial credit 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 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. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002 Writing Assessment. |
||||||||||
| W1 | 1 | W004002 | 0.97 | -0.11 | † | 2.35 | 1.51 | -0.11 | -1.55 | -2.21 |
| W2 | 1 | W004102 | 0.97 | 0.11 | † | 2.34 | 1.32 | -0.21 | -1.21 | -2.23 |
| W3 | 1 | W004202 | 1.09 | 0.03 | † | 1.97 | 1.31 | 0.00 | -1.16 | -2.12 |
| W4 | 1 | W004402 | 1.05 | -0.36 | † | 1.81 | 1.25 | 0.37 | -1.09 | -2.33 |
| W5 | 1 | W004502 | 1.19 | -0.25 | † | 1.73 | 1.30 | 0.36 | -1.15 | -2.24 |
| W6 | 1 | W004602 | 1.19 | -0.44 | † | 2.10 | 1.25 | 0.21 | -1.22 | -2.34 |
| W7 | 1 | W004702 | 0.92 | -0.17 | † | 1.67 | 1.49 | 0.48 | -1.18 | -2.47 |
| W8 | 1 | W004802 | 0.69 | 0.17 | † | 1.60 | 1.71 | 0.17 | -1.28 | -2.19 |
| W9 | 1 | W004902 | 0.77 | 0.26 | † | 1.95 | 1.98 | 0.00 | -1.49 | -2.45 |
| W11 | 1 | W005002 | 0.96 | 0.42 | † | 2.49 | 1.54 | -0.04 | -1.52 | -2.47 |
| W12 | 1 | W005102 | 1.17 | -0.06 | † | 2.42 | 1.50 | 0.22 | -1.51 | -2.62 |
| W13 | 1 | W005202 | 0.91 | 0.44 | † | 2.22 | 1.60 | 0.13 | -1.47 | -2.48 |
| W14 | 1 | W005302 | 1.43 | 0.02 | † | 2.16 | 1.57 | 0.10 | -1.46 | -2.38 |
| W15 | 1 | W005602 | 0.82 | 0.17 | † | 1.90 | 1.30 | 0.40 | -1.29 | -2.31 |
| W16 | 1 | W005702 | 1.05 | 0.11 | † | 1.70 | 1.41 | 0.27 | -1.25 | -2.12 |
| W17 | 1 | W005802 | 1.03 | 0.09 | † | 2.10 | 1.60 | 0.30 | -1.50 | -2.51 |
| W18 | 1 | W005902 | 0.77 | 0.19 | † | 1.98 | 1.81 | 0.48 | -1.53 | -2.74 |
| W19 | 1 | W010602 | 0.86 | -0.23 | † | 2.02 | 1.60 | 0.30 | -1.51 | -2.41 |
| W20 | 1 | W010802 | 0.80 | 0.51 | † | 2.27 | 1.63 | 0.26 | -1.61 | -2.55 |
| W21 | 1 | W010702 | 0.89 | 0.09 | † | 2.37 | 1.69 | 0.33 | -1.41 | -2.99 |
Last updated 16 February 2009 (GF)
