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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 Measurement Scale, by Block and Item, Grade 8 Mathematics National Main Assessment (Accommodations Permitted [R3]): 2000
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 |
|---|---|---|---|---|---|---|---|---|---|
| M3 | 3 | M093201 | 0.69 | 1.54 | 0.25 | † | † | † | † |
| 7A | M093601 | 0.82 | 1.53 | 0.00 | 1.28 | -1.28 | † | † | |
| M4 | 2 | M017501 | 0.34 | -2.98 | 0.19 | † | † | † | † |
| 8 | M018101 | 0.58 | -0.45 | 0.17 | † | † | † | † | |
| 18 | M019101 | 1.38 | 1.56 | 0.17 | † | † | † | † | |
| 19 | M019201 | 1.40 | 1.55 | 0.14 | † | † | † | † | |
| M6 | 7A | M020301 | 0.99 | -0.44 | 0.00 | † | † | † | † |
| M7 | 9A | M068008 | 0.44 | 1.98 | 0.00 | 0.31 | -0.31 | † | † |
| M8 | 2A | M012331 | 0.70 | -1.59 | 0.21 | † | † | † | † |
| 14A | M013331 | 0.98 | -1.24 | 0.20 | † | † | † | † | |
| M9 | 1 | M052301 | 1.67 | 0.64 | 0.21 | † | † | † | † |
| M10 | 1 | M085501 | 1.44 | 0.82 | 0.17 | † | † | † | † |
| 2 | M085601 | 0.93 | -0.04 | 0.21 | † | † | † | † | |
| M11 | 12 | M047101 | 1.11 | 0.23 | 0.15 | † | † | † | † |
| 13 | M047201 | 0.74 | -1.00 | 0.16 | † | † | † | † | |
| 18A | M047901 | 1.10 | 1.52 | 0.00 | † | † | † | † | |
| M13 | 2A | M051301 | 0.37 | -2.72 | 0.00 | † | † | † | † |
| 11A | M052201 | 0.78 | 0.92 | 0.00 | 0.71 | -0.38 | -0.33 | † | |
| M14 | 1A | M072801 | 0.64 | 0.36 | 0.30 | † | † | † | † |
| 6A | M073301 | 1.09 | 1.29 | 0.23 | † | † | † | † | |
| M15 | 1A | M075201 | 0.62 | -0.48 | 0.23 | † | † | † | † |
| 3A | M075401 | 0.51 | 0.22 | 0.00 | 1.09 | -1.09 | † | † | |
| 5A | M075601 | 0.53 | 0.26 | 0.00 | -0.99 | 0.99 | † | † | |
| 9A | M076001 | 0.49 | 1.43 | 0.00 | -1.77 | 0.82 | 0.95 | † | |
| † 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)