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), 2009 Science Assessment. |
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S3 | 4 | K133301 | 0.41 | 2.12 | † | -0.54 | 0.54 | † | † |
5 | K1572CL | 0.29 | 1.29 | † | 1.61 | 2.63 | -4.24 | † | |
S4 | 2 | K128001 | 0.21 | -1.82 | 0.31 | † | † | † | † |
10 | K157701 | 1.17 | 1.89 | 0.27 | † | † | † | † | |
11 | K157801 | 0.87 | 0.47 | 0.23 | † | † | † | † | |
12 | K157901 | 0.86 | -0.00 | † | † | † | † | † | |
18 | K130201 | 1.04 | 0.99 | 0.31 | † | † | † | † | |
S5 | 4 | K143901 | 0.76 | 0.22 | 0.30 | † | † | † | † |
5 | K143902 | 1.79 | 2.05 | 0.19 | † | † | † | † | |
6 | K143903 | 0.62 | 1.75 | † | 0.54 | -0.54 | † | † | |
10 | K130301 | 0.82 | -0.82 | † | † | † | † | † | |
S6 | 2 | K135001 | 0.83 | 1.87 | † | 0.20 | -0.14 | -0.07 | † |
3 | K134701 | 0.84 | 1.45 | 0.33 | † | † | † | † | |
5 | K130901 | 0.23 | 1.04 | 0.31 | † | † | † | † | |
11 | K140501 | 0.66 | 0.95 | 0.29 | † | † | † | † | |
12 | K143201 | 0.92 | -0.35 | 0.24 | † | † | † | † | |
17 | K130701 | 1.36 | 1.36 | 0.25 | † | † | † | † | |
S7 | 3 | K131401 | 0.59 | 0.39 | 0.26 | † | † | † | † |
7 | K131901 | 0.97 | 1.58 | 0.17 | † | † | † | † | |
13 | K141901 | 1.43 | 0.64 | 0.29 | † | † | † | † | |
14 | K158301 | 0.77 | 1.34 | † | 0.47 | -0.47 | † | † | |
16 | K132101 | 1.28 | 0.00 | 0.20 | † | † | † | † | |
S8 | 2 | K140801 | 1.28 | 0.75 | 0.21 | † | † | † | † |
9 | K142401 | 0.64 | 0.21 | † | 0.27 | -0.27 | † | † | |
12 | K137601 | 0.28 | 0.22 | † | -1.04 | 0.08 | 0.96 | † | |
13 | K137602 | 1.81 | 1.55 | 0.38 | † | † | † | † | |
16 | K137001 | 0.89 | 0.98 | 0.24 | † | † | † | † | |
S9 | 3 | K126701 | 0.39 | 1.42 | 0.27 | † | † | † | † |
8 | K139701 | 1.58 | 0.30 | 0.13 | † | † | † | † | |
9 | K139702 | 1.33 | 0.12 | 0.25 | † | † | † | † | |
12 | K139101 | 0.61 | 1.00 | † | -0.35 | 0.35 | † | † | |
17 | K131601 | 0.53 | -0.44 | 0.27 | † | † | † | † | |
18 | K128101 | 1.46 | 0.43 | 0.32 | † | † | † | † | |
S10 | 9 | K1586CL | 0.74 | 1.65 | † | 2.25 | 0.66 | -1.50 | -1.42 |
13 | K129801 | 0.68 | 2.45 | 0.36 | † | † | † | † | |
15 | K140901 | 1.68 | 0.50 | 0.29 | † | † | † | † | |
S11 | 2 | K139301 | 0.86 | -0.06 | 0.29 | † | † | † | † |
9 | K125802 | 0.95 | 1.62 | † | 0.47 | -0.47 | † | † | |
10 | K125803 | 0.71 | 1.42 | † | -0.63 | 0.63 | † | † | |
15 | K141801 | 1.00 | 2.17 | 0.28 | † | † | † | † | |
S12 | 2 | K133001 | 0.57 | 2.04 | 0.24 | † | † | † | † |
5 | K128701 | 0.34 | 1.11 | † | 0.47 | 0.46 | -1.45 | 0.52 | |
15 | K142101 | 0.72 | 0.55 | 0.28 | † | † | † | † | |
S13 | 2 | K129501 | 0.80 | 2.16 | 0.47 | † | † | † | † |
4 | K126001 | 0.62 | 1.33 | † | 0.31 | 0.13 | 0.04 | -0.48 | |
13 | K144601 | 0.87 | 0.75 | 0.23 | † | † | † | † |