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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for the Number Sense, Properties, and Operations Scale, Grade 8 Mathematics State Assessment (Accommodations Not Permitted [R2]): 2000
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 |
|---|---|---|---|---|---|---|---|---|---|
| M3 | 2 | M093101 | 1.21 | 0.31 | 0.25 | † | † | † | † |
| M4 | 1 | M017401 | 0.24 | -5.28 | 0.23 | † | † | † | † |
| 4 | M017701 | 0.88 | -1.08 | 0.14 | † | † | † | † | |
| 6 | M017901 | 1.13 | -0.93 | 0.11 | † | † | † | † | |
| 9 | M018201 | 0.56 | -0.71 | 0.08 | † | † | † | † | |
| 11 | M018401 | 1.18 | -0.74 | 0.30 | † | † | † | † | |
| 12 | M018501 | 1.99 | 0.51 | 0.25 | † | † | † | † | |
| 13 | M018601 | 0.70 | 1.00 | 0.13 | † | † | † | † | |
| M5 | 5 | M066401 | 0.74 | -0.06 | 0.21 | † | † | † | † |
| M6 | 4A | M020001 | 0.70 | -0.29 | 0.00 | † | † | † | † |
| 5A | M020101 | 1.29 | -0.42 | 0.00 | † | † | † | † | |
| 9A | M020501 | 0.79 | -0.38 | 0.00 | † | † | † | † | |
| M7 | 3 | M067801 | 0.85 | -1.28 | 0.21 | † | † | † | † |
| M8 | 3A | M012431 | 0.90 | -0.18 | 0.15 | † | † | † | † |
| 4A | M012531 | 0.78 | 0.53 | 0.11 | † | † | † | † | |
| 8A | M012931 | 1.17 | 0.81 | 0.23 | † | † | † | † | |
| 12A | N202831 | 0.77 | -1.74 | 0.33 | † | † | † | † | |
| 13A | M011131 | 0.65 | -1.27 | 0.25 | † | † | † | † | |
| 15A | M013431 | 1.18 | 0.02 | 0.17 | † | † | † | † | |
| 16A | M013531 | 1.11 | 1.13 | 0.12 | † | † | † | † | |
| 17A | M013631 | 1.71 | 0.51 | 0.07 | † | † | † | † | |
| M9 | 2A | M052401 | 0.88 | 0.88 | 0.00 | † | † | † | † |
| 7A | M052901 | 0.72 | 0.01 | 0.00 | † | † | † | † | |
| 8A | M053001 | 0.89 | 1.28 | 0.00 | † | † | † | † | |
| M10 | 6 | M086001 | 1.35 | 1.16 | 0.22 | † | † | † | † |
| M11 | 1A | M046001 | 0.42 | -2.71 | 0.00 | † | † | † | † |
| 4 | M046301 | 1.03 | -1.03 | 0.22 | † | † | † | † | |
| 6 | M046501 | 1.02 | -0.18 | 0.33 | † | † | † | † | |
| 9A | M046801 | 0.61 | -1.18 | 0.00 | † | † | † | † | |
| 10A | M046901 | 0.94 | -1.54 | 0.00 | † | † | † | † | |
| M12 | 1 | M091501 | 1.35 | 0.59 | 0.19 | † | † | † | † |
| 3 | M091601 | 1.05 | 0.38 | 0.23 | † | † | † | † | |
| 8 | M091901 | 0.47 | -0.02 | 0.15 | † | † | † | † | |
| M13 | 1A | M051201 | 0.54 | -1.47 | 0.00 | † | † | † | † |
| 4 | M051501 | 1.05 | 1.49 | 0.22 | † | † | † | † | |
| 5A | M051601 | 0.82 | -0.65 | 0.00 | † | † | † | † | |
| 8 | M051901 | 1.75 | 0.66 | 0.09 | † | † | † | † | |
| M14 | 3A | M073001 | 1.47 | 0.09 | 0.20 | † | † | † | † |
| 4A | M073101 | 1.12 | 0.95 | 0.40 | † | † | † | † | |
| 7 | M073402 | 2.58 | 1.41 | 0.18 | † | † | † | † | |
| 9 | M073602 | 0.80 | 1.01 | 0.47 | † | † | † | † | |
| 9A | M073601 | 0.53 | 1.14 | 0.00 | -0.33 | -0.39 | 0.72 | † | |
| M15 | 8A | M075901 | 0.65 | 1.07 | 0.19 | † | † | † | † |
| † Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. 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 or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Mathematics Assessment. |
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Last updated 14 July 2008 (KL)
