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 | 2 | K126501 | 0.38 | -0.75 | 0.25 | † | † | † | † |
7 | K139001 | 0.82 | 0.62 | † | 1.01 | -1.01 | † | † | |
9 | K126301 | 1.28 | 1.01 | 0.31 | † | † | † | † | |
10 | K126302 | 1.84 | 0.60 | 0.19 | † | † | † | † | |
11 | K126303 | 0.53 | 1.42 | † | -0.68 | 1.55 | 0.48 | -1.36 | |
12 | K126304 | 1.36 | 0.29 | † | † | † | † | † | |
S4 | 1 | K137501 | 0.68 | -2.45 | 0.24 | † | † | † | † |
7 | K137201 | 0.43 | 1.54 | † | -0.41 | -0.28 | 0.69 | † | |
8 | K137202 | 0.81 | -0.08 | 0.30 | † | † | † | † | |
14 | K126801 | 1.08 | 0.75 | 0.19 | † | † | † | † | |
17 | K134801 | 1.13 | 0.10 | 0.22 | † | † | † | † | |
S5 | 2 | K129601 | 0.90 | 1.34 | † | 0.48 | -0.48 | † | † |
3 | K129602 | 0.96 | 0.06 | 0.34 | † | † | † | † | |
11 | K132301 | 1.99 | 1.75 | 0.26 | † | † | † | † | |
12 | K132302 | 0.81 | 0.91 | 0.22 | † | † | † | † | |
13 | K132303 | 2.37 | 1.24 | 0.13 | † | † | † | † | |
14 | K132304 | 0.56 | -0.86 | 0.24 | † | † | † | † | |
16 | K136701 | 0.79 | 0.33 | 0.27 | † | † | † | † | |
S6 | 1 | K158101 | 1.93 | 0.52 | 0.27 | † | † | † | † |
6 | K139801 | 0.51 | 0.53 | † | 0.33 | -0.33 | † | † | |
10 | K143801 | 0.87 | 2.50 | † | 0.61 | -0.61 | † | † | |
13 | K134501 | 1.52 | 1.06 | 0.16 | † | † | † | † | |
14 | K134502 | 1.02 | 0.05 | 0.25 | † | † | † | † | |
15 | K134503 | 0.61 | 2.46 | † | † | † | † | † | |
S7 | 2 | K135601 | 0.52 | -0.57 | 0.20 | † | † | † | † |
8 | K132701 | 1.41 | 1.62 | † | 0.40 | -0.40 | † | † | |
9 | K142701 | 0.83 | 1.08 | 0.21 | † | † | † | † | |
10 | K142703 | 1.18 | 0.38 | 0.25 | † | † | † | † | |
11 | K142704 | 1.41 | 1.39 | 0.17 | † | † | † | † | |
12 | K135401 | 0.43 | 0.35 | † | -0.07 | 0.07 | † | † | |
15 | K137801 | 0.74 | -0.38 | 0.28 | † | † | † | † | |
17 | K142201 | 0.73 | -0.20 | 0.21 | † | † | † | † | |
S8 | 1 | K136201 | 1.93 | 0.78 | 0.17 | † | † | † | † |
3 | K127201 | 0.44 | -0.16 | † | 1.16 | 1.39 | -0.91 | -1.65 | |
7 | K136401 | 0.85 | 1.35 | † | -0.14 | 0.14 | † | † | |
8 | K134001 | 1.55 | 1.10 | 0.18 | † | † | † | † | |
14 | K136901 | 1.44 | 0.89 | 0.34 | † | † | † | † | |
15 | K139201 | 2.63 | 1.31 | 0.31 | † | † | † | † | |
17 | K128801 | 0.58 | -1.91 | 0.24 | † | † | † | † | |
S9 | 5 | K131101 | 0.61 | 1.13 | 0.37 | † | † | † | † |
6 | K131102 | 0.80 | -0.61 | 0.23 | † | † | † | † | |
7 | K131103 | 0.45 | 1.09 | † | -0.34 | 0.34 | † | † | |
11 | K138101 | 0.98 | 1.14 | 0.25 | † | † | † | † | |
14 | K138401 | 1.43 | 1.38 | † | 0.94 | -0.94 | † | † | |
15 | K138402 | 1.01 | 1.87 | † | 0.75 | -0.26 | -0.49 | † | |
S10 | 2 | K129401 | 0.53 | -0.48 | 0.25 | † | † | † | † |
4 | K141501 | 0.92 | -1.00 | 0.23 | † | † | † | † | |
5 | K1585CL | 0.53 | 2.11 | † | 2.29 | 1.02 | -3.31 | † | |
6 | K141503 | 1.13 | 1.55 | † | 0.37 | -0.37 | † | † | |
10 | K130401 | 0.47 | -0.74 | 0.28 | † | † | † | † | |
11 | K130402 | 2.74 | 1.77 | 0.17 | † | † | † | † | |
S11 | 1 | K136001 | 0.42 | -0.76 | 0.22 | † | † | † | † |
5 | K127701 | 0.42 | 0.78 | † | 1.52 | 0.09 | -1.61 | † | |
11 | K144201 | 1.50 | 1.29 | 0.11 | † | † | † | † | |
12 | K144202 | 0.84 | 1.44 | † | 0.29 | -0.29 | † | † | |
14 | K139601 | 0.77 | 1.34 | 0.23 | † | † | † | † | |
S12 | 1 | K143101 | 1.23 | 0.56 | 0.25 | † | † | † | † |
4 | K129001 | 0.95 | 2.83 | † | 0.85 | -0.85 | † | † | |
7 | K133401 | 0.38 | 1.62 | † | 1.35 | -1.35 | † | † | |
9 | K142901 | 0.96 | 1.28 | 0.15 | † | † | † | † | |
12 | K127401 | 1.10 | -0.85 | 0.16 | † | † | † | † | |
14 | K127403 | 0.84 | -0.73 | 0.18 | † | † | † | † | |
16 | K130101 | 0.91 | 0.45 | 0.26 | † | † | † | † | |
S13 | 1 | K143401 | 0.72 | 1.37 | 0.20 | † | † | † | † |
5 | K140301 | 0.57 | 1.13 | † | 0.67 | -0.67 | † | † | |
6 | K1587CL | 0.60 | 1.55 | † | 0.73 | 2.01 | -2.74 | † | |
7 | K140303 | 0.73 | 0.10 | † | -0.01 | 0.01 | † | † | |
8 | K142001 | 0.76 | 1.83 | 0.23 | † | † | † | † | |
14 | K129201 | 0.93 | 0.25 | 0.24 | † | † | † | † | |
16 | K138601 | 1.56 | 1.05 | 0.26 | † | † | † | † |