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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 12 Writing National 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 | W008302 | 0.74 | -0.58 | † | 1.75 | 1.80 | 0.59 | -1.48 | -2.66 |
| W2 | 1 | W008402 | 0.64 | -0.26 | † | 1.51 | 1.85 | 1.09 | -0.98 | -3.47 |
| W3 | 1 | W008602 | 0.85 | -0.73 | † | 2.43 | 1.35 | 0.37 | -1.34 | -2.80 |
| W4 | 1 | W008702 | 0.98 | -0.49 | † | 2.56 | 1.15 | 0.16 | -1.39 | -2.48 |
| W5 | 1 | W008902 | 1.12 | -0.73 | † | 2.35 | 1.21 | 0.19 | -1.18 | -2.57 |
| W6 | 1 | W009102 | 0.91 | -0.33 | † | 1.97 | 1.43 | 0.51 | -1.54 | -2.37 |
| W7 | 1 | W009202 | 1.06 | -0.18 | † | 1.72 | 1.19 | 0.34 | -0.86 | -2.39 |
| W8 | 1 | W009302 | 0.77 | -0.61 | † | 1.63 | 1.13 | 0.42 | -1.03 | -2.14 |
| W9 | 1 | W009402 | 0.68 | 0.06 | † | 1.83 | 1.56 | 0.27 | -1.40 | -2.25 |
| W10 | 1 | W009502 | 0.93 | -0.30 | † | 1.56 | 1.21 | 0.48 | -0.91 | -2.34 |
| W11 | 1 | W009702 | 1.06 | -0.04 | † | 1.83 | 1.19 | 0.15 | -1.14 | -2.04 |
| W12 | 1 | W009802 | 0.79 | -0.17 | † | 1.82 | 1.14 | 0.40 | -1.39 | -1.97 |
| W13 | 1 | W009902 | 0.68 | -0.26 | † | 1.87 | 1.30 | 0.36 | -1.51 | -2.03 |
| W14 | 1 | W010002 | 0.89 | -0.37 | † | 1.93 | 1.09 | 0.36 | -1.15 | -2.22 |
| W15 | 1 | W010202 | 0.71 | -0.12 | † | 1.94 | 1.41 | 0.43 | -1.25 | -2.53 |
| W16 | 1 | W010302 | 0.89 | -0.18 | † | 1.92 | 1.17 | 0.20 | -1.07 | -2.23 |
| W17 | 1 | W010402 | 0.74 | -0.41 | † | 1.72 | 1.38 | 0.12 | -1.21 | -2.02 |
| W18 | 1 | W011202 | 0.84 | -0.77 | † | 2.42 | 1.17 | 0.34 | -1.03 | -2.89 |
| W19 | 1 | W011302 | 0.82 | -0.11 | † | 1.98 | 1.38 | 0.23 | -1.16 | -2.43 |
| W20 | 1 | W011402 | 1.01 | -0.28 | † | 2.17 | 1.31 | 0.42 | -1.27 | -2.64 |
Last updated 16 February 2009 (GF)
