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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 12 Mathematics National Main Assessment (Accommodations Not Permitted [R2]): 2000
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 |
|---|---|---|---|---|---|---|---|---|---|
| M3 | 1 | M055801 | 0.59 | -1.90 | 0.20 | † | † | † | † |
| M4 | 2 | M017501 | 0.37 | -3.41 | 0.24 | † | † | † | † |
| 8 | M018101 | 0.49 | -1.07 | 0.20 | † | † | † | † | |
| 18 | M019101 | 0.90 | 0.83 | 0.16 | † | † | † | † | |
| 19 | M019201 | 1.60 | 0.93 | 0.18 | † | † | † | † | |
| M6 | 7 | M020301 | 0.97 | -1.34 | 0.00 | † | † | † | † |
| M7 | 1 | M071501 | 1.15 | -0.93 | 0.18 | † | † | † | † |
| 2 | M071502 | 0.76 | 0.37 | 0.00 | -1.02 | 1.02 | † | † | |
| M8 | 2 | M012331 | 0.67 | -2.28 | 0.21 | † | † | † | † |
| 13 | M011331 | 1.60 | 0.33 | 0.20 | † | † | † | † | |
| 19 | M011931 | 1.92 | 1.90 | 0.00 | † | † | † | † | |
| M9 | 1 | M052301 | 2.07 | 0.11 | 0.25 | † | † | † | † |
| M10 | 6 | M094401 | 1.10 | -0.61 | 0.20 | † | † | † | † |
| M11 | 1 | M058501 | 0.91 | 0.14 | 0.13 | † | † | † | † |
| 14 | M059801 | 1.33 | 1.90 | 0.00 | † | † | † | † | |
| M12 | 3 | M092301 | 0.87 | 0.17 | 0.00 | 0.60 | -0.60 | † | † |
| 9 | M092901 | 0.52 | 1.74 | 0.00 | 1.15 | -1.22 | 0.26 | -0.20 | |
| M13 | 1 | M095501 | 1.71 | 0.72 | 0.31 | † | † | † | † |
| 2 | M095601 | 1.66 | 0.50 | 0.13 | † | † | † | † | |
| 6 | M095101 | 1.73 | 0.91 | 0.21 | † | † | † | † | |
| M14 | 2 | M073801 | 0.61 | 0.55 | 0.00 | -1.69 | 1.69 | † | † |
| 6 | M073301 | 0.90 | 0.22 | 0.33 | † | † | † | † | |
| M15 | 9 | M076901 | 0.48 | 1.94 | 0.00 | -2.26 | 2.26 | † | † |
| † 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)
