Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 |
---|---|---|---|---|---|---|---|---|---|
† Not applicable; c parameters are not estimated for generalized partial credit 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 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. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2008 Reading Long-Term Assessment. |
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RA | 1 | N023701 | 1.04 | -2.73 | 0.29 | † | † | † | † |
2 | N023702 | 0.87 | -1.79 | 0.27 | † | † | † | † | |
3 | N021201 | 1.50 | -1.61 | 0.37 | † | † | † | † | |
4 | N021202 | 0.82 | -0.45 | 0.23 | † | † | † | † | |
5 | N021203 | 0.25 | -0.38 | † | 2.82 | 0.31 | -1.38 | -1.75 | |
6 | N023101 | 0.77 | -1.07 | 0.26 | † | † | † | † | |
7 | N023102 | 1.00 | -0.82 | 0.23 | † | † | † | † | |
8 | N025401 | 1.17 | -0.67 | 0.39 | † | † | † | † | |
9 | N025402 | 0.97 | -0.16 | 0.26 | † | † | † | † | |
10 | N025403 | 0.79 | 0.50 | 0.42 | † | † | † | † | |
RB | 1 | N021401 | 0.73 | -1.21 | 0.37 | † | † | † | † |
2 | N021402 | 0.59 | -1.17 | 0.21 | † | † | † | † | |
3 | N021403 | 1.48 | -0.77 | 0.32 | † | † | † | † | |
4 | N023801 | 1.45 | -1.63 | 0.24 | † | † | † | † | |
5 | N023802 | 0.52 | -1.08 | † | -0.01 | 1.46 | -1.45 | † | |
6 | N025501 | 0.65 | 0.20 | 0.29 | † | † | † | † | |
7 | N025502 | 1.23 | 0.42 | 0.22 | † | † | † | † | |
8 | N025503 | 0.69 | -0.36 | 0.17 | † | † | † | † | |
9 | N025504 | 0.65 | -0.15 | 0.19 | † | † | † | † | |
10 | N025505 | 1.32 | 0.61 | 0.34 | † | † | † | † | |
RC | 1 | N024001 | 1.02 | -0.43 | 0.27 | † | † | † | † |
2 | N024002 | 1.60 | -0.90 | 0.40 | † | † | † | † | |
3 | N021801 | 0.79 | -1.65 | 0.22 | † | † | † | † | |
4 | N021802 | 0.70 | -0.27 | 0.26 | † | † | † | † | |
5 | N021803 | 0.24 | -0.40 | † | 1.52 | -1.62 | 0.11 | † | |
6 | N023901 | 0.97 | -0.30 | 0.24 | † | † | † | † | |
7 | N022001 | 1.17 | -1.63 | 0.27 | † | † | † | † | |
8 | N022002 | 1.39 | -1.57 | 0.21 | † | † | † | † | |
9 | N022003 | 1.13 | -1.40 | 0.24 | † | † | † | † | |
10 | N022004 | 1.90 | -1.57 | 0.26 | † | † | † | † | |
RD | 1 | N025601 | 1.42 | -2.45 | 0.22 | † | † | † | † |
2 | N025602 | 1.21 | -1.75 | 0.25 | † | † | † | † | |
3 | N025603 | 1.10 | -1.68 | 0.28 | † | † | † | † | |
4 | N022101 | 1.57 | -1.81 | 0.30 | † | † | † | † | |
5 | N022102 | 1.19 | -0.34 | 0.22 | † | † | † | † | |
6 | N022103 | 0.56 | -0.03 | † | 1.80 | 0.27 | -2.08 | † | |
7 | N024101 | 0.76 | -1.06 | 0.32 | † | † | † | † | |
8 | N024102 | 1.55 | 0.11 | 0.22 | † | † | † | † | |
9 | N024103 | 1.45 | -0.38 | 0.30 | † | † | † | † | |
10 | N024104 | 0.58 | -0.85 | 0.25 | † | † | † | † | |
RE | 1 | N024301 | 1.13 | 0.37 | 0.26 | † | † | † | † |
2 | N024302 | 0.49 | -0.67 | 0.25 | † | † | † | † | |
3 | N022401 | 1.82 | -0.89 | 0.38 | † | † | † | † | |
4 | N022402 | 1.97 | -0.68 | 0.19 | † | † | † | † | |
5 | N022403 | 1.94 | -0.59 | 0.22 | † | † | † | † | |
6 | N022404 | 2.56 | -0.54 | 0.17 | † | † | † | † | |
7 | N022405 | 0.70 | -0.64 | † | -1.00 | 2.36 | -1.36 | † | |
8 | N024801 | 0.74 | -2.94 | 0.23 | † | † | † | † | |
9 | N024802 | 1.06 | -2.29 | 0.26 | † | † | † | † | |
10 | N024803 | 0.61 | -1.36 | 0.30 | † | † | † | † | |
RF | 1 | N024501 | 1.00 | -1.29 | 0.35 | † | † | † | † |
2 | N024502 | 0.66 | -1.02 | 0.23 | † | † | † | † | |
3 | N024503 | 1.10 | -0.35 | 0.22 | † | † | † | † | |
4 | N024504 | 1.41 | 1.28 | 0.31 | † | † | † | † | |
5 | N025701 | 0.85 | -0.69 | 0.18 | † | † | † | † | |
6 | N025702 | 0.90 | -0.48 | 0.28 | † | † | † | † | |
7 | N025703 | 1.04 | -0.28 | 0.21 | † | † | † | † | |
8 | N025704 | 0.62 | 0.32 | † | 0.90 | 0.19 | -1.09 | † | |
9 | N024701 | 0.88 | -1.24 | 0.30 | † | † | † | † | |
RG | 1 | N024901 | 0.56 | -0.89 | 0.16 | † | † | † | † |
2 | N024902 | 0.87 | -2.25 | 0.27 | † | † | † | † | |
3 | N024903 | 1.03 | -2.12 | 0.27 | † | † | † | † | |
4 | N025001 | 0.82 | -1.46 | 0.30 | † | † | † | † | |
5 | N025002 | 1.20 | -1.65 | 0.32 | † | † | † | † | |
6 | N025003 | 0.82 | -1.29 | 0.24 | † | † | † | † | |
7 | N025101 | 0.55 | -0.73 | 0.24 | † | † | † | † | |
8 | N025801 | 0.72 | -0.86 | 0.29 | † | † | † | † | |
9 | N025802 | 0.70 | -0.95 | 0.31 | † | † | † | † | |
10 | N025803 | 0.61 | 0.13 | 0.20 | † | † | † | † | |
11 | N025804 | 2.13 | 0.22 | 0.24 | † | † | † | † | |
RH | 1 | N028001 | 0.75 | -0.63 | 0.24 | † | † | † | † |
2 | N028002 | 1.22 | -1.20 | 0.37 | † | † | † | † | |
3 | N028003 | 1.16 | -1.59 | 0.26 | † | † | † | † | |
4 | N027301 | 1.23 | -0.64 | 0.40 | † | † | † | † | |
5 | N027302 | 0.43 | 0.18 | † | 2.81 | 0.92 | 0.45 | -4.18 | |
6 | N026101 | 1.00 | -0.75 | 0.21 | † | † | † | † | |
7 | N026102 | 0.59 | -0.12 | 0.30 | † | † | † | † | |
8 | N027801 | 0.72 | -1.24 | 0.24 | † | † | † | † | |
9 | N027802 | 1.88 | -0.69 | 0.34 | † | † | † | † | |
10 | N027803 | 1.30 | -0.62 | 0.25 | † | † | † | † | |
11 | N027804 | 0.86 | -0.13 | 0.23 | † | † | † | † | |
RI | 1 | N029101 | 0.93 | -0.31 | 0.32 | † | † | † | † |
2 | N029102 | 1.02 | 0.28 | 0.26 | † | † | † | † | |
3 | N029103 | 0.94 | -1.50 | 0.30 | † | † | † | † | |
4 | N029104 | 0.74 | 0.36 | 0.17 | † | † | † | † | |
5 | N029201 | 0.66 | 0.67 | 0.28 | † | † | † | † | |
6 | N029202 | 0.86 | 0.37 | 0.29 | † | † | † | † | |
7 | N029203 | 0.95 | -1.35 | 0.29 | † | † | † | † | |
8 | N029001 | 0.86 | -0.34 | 0.18 | † | † | † | † | |
9 | N029002 | 0.54 | 0.16 | † | 1.63 | -0.29 | -1.34 | † | |
10 | N028901 | 0.93 | -1.03 | 0.40 | † | † | † | † | |
11 | N028902 | 0.82 | -0.46 | 0.29 | † | † | † | † | |
RJ | 1 | N028201 | 0.83 | -0.70 | 0.21 | † | † | † | † |
2 | N028202 | 1.11 | -0.98 | 0.20 | † | † | † | † | |
3 | N028203 | 1.34 | -1.20 | 0.30 | † | † | † | † | |
4 | N028301 | 0.67 | 0.55 | 0.36 | † | † | † | † | |
5 | N028302 | 0.70 | -2.21 | 0.25 | † | † | † | † | |
6 | N028401 | 0.83 | 0.08 | 0.34 | † | † | † | † | |
7 | N028402 | 1.13 | -0.24 | 0.22 | † | † | † | † | |
8 | N028501 | 1.42 | -0.08 | 0.33 | † | † | † | † | |
9 | N028502 | 0.97 | -0.01 | 0.22 | † | † | † | † | |
10 | N028503 | 1.42 | -0.44 | 0.30 | † | † | † | † | |
11 | N028504 | 0.61 | -0.74 | 0.29 | † | † | † | † |