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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for Items in the Geometry and Spatial Sense Scale, Grade 8 Mathematics Combined National and State Main Assessment, by Item and Block: 2007
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 |
|---|---|---|---|---|---|---|---|---|---|
| † Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic 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 represents 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), 2007 Mathematics Assessment. |
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| M3 | 3 | M150001 | 1.04 | 1.07 | 0.46 | † | † | † | † |
| 6 | M150301 | 1.35 | 0.43 | 0.11 | † | † | † | † | |
| M4 | 1 | M151301 | 0.85 | -0.53 | 0.11 | † | † | † | † |
| 3 | M151501 | 0.71 | -0.32 | † | 0.31 | -0.31 | † | † | |
| M5 | 1 | M085701 | 0.43 | -0.70 | † | † | † | † | † |
| 2 | M085901 | 0.51 | -0.25 | † | 1.21 | -1.21 | † | † | |
| 5 | M085801 | 0.76 | -0.05 | 0.22 | † | † | † | † | |
| 15 | M019601 | 0.90 | 1.02 | 0.17 | † | † | † | † | |
| M6 | 3 | M140601 | 0.72 | -1.16 | 0.24 | † | † | † | † |
| 9 | M141201 | 0.69 | 0.83 | 0.15 | † | † | † | † | |
| 11 | M141401 | 0.57 | 0.90 | 0.16 | † | † | † | † | |
| 14 | M141701 | 0.89 | 1.28 | 0.11 | † | † | † | † | |
| M7 | 4 | M143901 | 0.79 | 0.16 | 0.14 | † | † | † | † |
| 6 | M144101 | 0.65 | 1.15 | 0.35 | † | † | † | † | |
| 11 | M144601 | 0.76 | 0.94 | † | 0.56 | -0.56 | † | † | |
| 16 | M145101 | 0.22 | 5.24 | † | † | † | † | † | |
| M8 | 7 | M021001 | 0.81 | -0.47 | † | † | † | † | † |
| 9 | M020901 | 0.66 | -0.45 | † | † | † | † | † | |
| 11 | M092401 | 0.71 | 0.80 | † | 1.99 | -1.99 | † | † | |
| M9 | 13 | M075801 | 0.66 | 0.85 | † | -0.10 | 0.10 | † | † |
| 16 | M051801 | 1.55 | 1.44 | 0.26 | † | † | † | † | |
| 17 | M093401 | 0.93 | 0.84 | 0.19 | † | † | † | † | |
| M10 | 3 | M142201 | 0.77 | -0.49 | 0.11 | † | † | † | † |
| 15 | M143401 | 0.97 | 0.72 | 0.22 | † | † | † | † | |
| 16 | M143501 | 0.43 | 0.90 | † | 2.02 | -1.19 | -1.80 | 0.96 | |
| M11 | 4 | M106001 | 0.81 | 0.99 | 0.22 | † | † | † | † |
| 8 | M106401 | 0.65 | 1.38 | 0.23 | † | † | † | † | |
| 13 | M106901 | 0.60 | 1.16 | † | † | † | † | † | |
| M12 | 1 | M152701 | 1.27 | -0.26 | 0.19 | † | † | † | † |
| 4 | M153001 | 0.87 | -0.50 | 0.20 | † | † | † | † | |
| 8 | M153401 | 0.85 | 1.25 | 0.18 | † | † | † | † | |
| 14 | M154001 | 0.79 | 0.49 | 0.09 | † | † | † | † | |
Last updated 08 January 2010 (JL)