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Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 |
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† Not applicable; c parameters are not estimated for generalized partial credit models.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002 Reading Assessment.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. For item j, dji may not sum to zero because of rounding. |
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R9 | 1 | R016101 | 0.42 | -0.91 | † | -0.04 | 0.04 |
2 | R016102 | 0.84 | -2.10 | 0.18 | † | † | |
3 | R016103 | 1.21 | -0.72 | 0.28 | † | † | |
4 | R016104 | 0.74 | -2.12 | 0.00 | † | † | |
5 | R016105 | 1.15 | -1.76 | 0.18 | † | † | |
6 | R016106 | 0.99 | -0.28 | 0.15 | † | † | |
7 | R016107 | 0.69 | -0.97 | † | -0.20 | 0.20 | |
8 | R016108 | 0.34 | -0.85 | † | -1.02 | 1.02 | |
9 | R016109 | 0.47 | 0.24 | † | 1.90 | -1.90 | |
R10 | 1 | R013401 | 1.03 | -0.30 | 0.15 | † | † |
2 | R013402 | 0.63 | -0.60 | † | † | † | |
3 | R013403 | 0.47 | -0.21 | † | -1.97 | 1.97 | |
4 | R013404 | 0.73 | -1.25 | 0.21 | † | † | |
5 | R013405 | 0.93 | -1.15 | 0.00 | † | † | |
6 | R013406 | 0.62 | 0.17 | 0.00 | † | † | |
7 | R013407 | 0.60 | -1.01 | 0.00 | † | † | |
8 | R013408 | 0.53 | -0.58 | 0.15 | † | † | |
9 | R013409 | 0.68 | -1.09 | 0.00 | † | † | |
10 | R013410 | 0.79 | -1.50 | 0.21 | † | † | |
11 | R013411 | 0.58 | -1.72 | 0.00 | † | † | |
12 | R013412 | 0.45 | -2.20 | 0.00 | † | † | |
R11 | 1 | R019301 | 0.41 | 0.80 | † | 0.03 | -0.03 |
2 | R019401 | 1.19 | 0.22 | † | 0.65 | -0.65 | |
3 | R019501 | 0.59 | -0.03 | 0.00 | † | † | |
4 | R019601 | 1.29 | 0.32 | 0.16 | † | † | |
5 | R019701 | 1.03 | 0.33 | 0.00 | † | † | |
6 | R019801 | 0.60 | -0.11 | 0.25 | † | † | |
7 | R019901 | 1.38 | -0.02 | 0.09 | † | † | |
8 | R020001 | 0.49 | -0.55 | † | 0.73 | -0.73 | |
9 | R020101 | 0.71 | -1.00 | 0.23 | † | † | |
10 | R020201 | 1.21 | -0.45 | 0.00 | † | † |