NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Geography Assessment IRT Parameters → IRT Parameters for the Space and Place Scale, Grade 4 Geography National Assessment: 2010
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 | dj5 |
|---|---|---|---|---|---|---|---|---|---|---|
| † 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: Single overall scale. 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), 2010 Geography Assessment. |
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| G3 | 1 | G0272CL | 0.62 | -0.04 | † | 0.31 | 0.15 | -0.46 | † | † |
| 2 | G027901 | 0.45 | -1.57 | 0.28 | † | † | † | † | † | |
| 11 | G028801 | 1.16 | 0.91 | 0.32 | † | † | † | † | † | |
| 15 | G029201 | 0.72 | -0.86 | 0.38 | † | † | † | † | † | |
| G4 | 1 | G008001 | 0.70 | -0.49 | † | † | † | † | † | † |
| 2 | G008002 | 1.08 | 1.07 | 0.17 | † | † | † | † | † | |
| 4 | G008201 | 0.60 | -0.14 | † | † | † | † | † | † | |
| 5 | G008301 | 1.17 | 1.15 | 0.44 | † | † | † | † | † | |
| 6 | G008401 | 0.64 | 0.85 | 0.31 | † | † | † | † | † | |
| 7 | G008501 | 1.54 | 0.78 | 0.17 | † | † | † | † | † | |
| 8 | G008502 | 1.28 | 0.90 | 0.22 | † | † | † | † | † | |
| 10 | G008601 | 0.56 | -1.40 | 0.24 | † | † | † | † | † | |
| 11 | G008701 | 0.77 | -0.61 | † | † | † | † | † | † | |
| 14 | G008902 | 0.64 | -1.19 | 0.25 | † | † | † | † | † | |
| G5 | 1 | G009101 | 0.87 | -0.25 | 0.33 | † | † | † | † | † |
| 2 | G009102 | 1.20 | 0.50 | 0.19 | † | † | † | † | † | |
| 3 | G009103 | 1.29 | 0.33 | 0.34 | † | † | † | † | † | |
| 6 | G009401 | 1.23 | 0.79 | 0.14 | † | † | † | † | † | |
| 11 | G009601 | 0.51 | -0.40 | † | 0.15 | 0.21 | -0.35 | † | † | |
| G6 | 1 | G0293CL | 0.62 | 1.24 | † | 2.53 | 0.46 | -2.99 | † | † |
| 10 | G030601 | 1.81 | 0.78 | 0.39 | † | † | † | † | † | |
| 11 | G030701 | 1.91 | 1.44 | 0.43 | † | † | † | † | † | |
| 12 | G0308CL | 0.47 | 1.32 | † | -2.98 | 2.98 | † | † | † | |
| 14 | G031301 | 0.99 | 0.08 | 0.29 | † | † | † | † | † | |
| G7 | 1 | G044601 | 1.12 | 0.39 | 0.32 | † | † | † | † | † |
| 2 | G043701 | 0.44 | -0.51 | † | -1.41 | -1.94 | 3.35 | † | † | |
| 3 | G043702 | 1.34 | 0.15 | 0.23 | † | † | † | † | † | |
| 4 | G043704 | 0.87 | 1.18 | † | 0.49 | -0.49 | † | † | † | |
| 8 | G043901 | 1.04 | 0.12 | 0.21 | † | † | † | † | † | |
| 9 | G044101 | 1.19 | 1.39 | 0.14 | † | † | † | † | † | |
| 10 | G059301 | 0.76 | 0.83 | 0.28 | † | † | † | † | † | |
| 11 | G044201 | 1.38 | -0.15 | 0.19 | † | † | † | † | † | |
| 12 | G044202 | 0.64 | 1.14 | † | † | † | † | † | † | |
| 14 | G044501 | 1.80 | 1.24 | 0.26 | † | † | † | † | † | |
| G8 | 1 | G059401 | 0.47 | -1.26 | † | -1.61 | 1.59 | 0.02 | † | † |
| 2 | G042501 | 0.79 | 1.23 | 0.32 | † | † | † | † | † | |
| 5 | G042701 | 0.87 | 1.41 | 0.22 | † | † | † | † | † | |
| 7 | G043501 | 0.85 | -1.03 | 0.27 | † | † | † | † | † | |
Last updated 30 June 2014 (GF)