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 Trend Assessment. |
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RA | 1 | N023701 | 0.78 | -2.62 | 0.27 | † | † | † | † |
2 | N023702 | 0.83 | -1.39 | 0.20 | † | † | † | † | |
3 | N021201 | 1.43 | -1.13 | 0.32 | † | † | † | † | |
4 | N021202 | 0.94 | 0.39 | 0.27 | † | † | † | † | |
5 | N021203 | 0.37 | -0.39 | † | 3.84 | -2.11 | -1.73 | † | |
6 | N021301 | 0.97 | -0.74 | 0.17 | † | † | † | † | |
7 | N021302 | 1.54 | 0.11 | 0.15 | † | † | † | † | |
8 | N021303 | 1.17 | 0.00 | 0.20 | † | † | † | † | |
9 | N023101 | 1.03 | -0.06 | 0.31 | † | † | † | † | |
10 | N023102 | 1.15 | 0.06 | 0.22 | † | † | † | † | |
RB | 1 | N021401 | 0.68 | -0.60 | 0.41 | † | † | † | † |
2 | N021402 | 0.48 | -0.64 | 0.19 | † | † | † | † | |
3 | N021403 | 1.47 | 0.02 | 0.30 | † | † | † | † | |
4 | N021501 | 1.31 | -0.97 | 0.36 | † | † | † | † | |
5 | N021502 | 1.08 | -0.62 | 0.27 | † | † | † | † | |
6 | N021503 | 0.83 | -1.54 | 0.23 | † | † | † | † | |
7 | N023801 | 1.72 | -0.89 | 0.38 | † | † | † | † | |
8 | N023802 | 0.55 | -0.43 | † | 0.14 | 1.65 | -1.79 | † | |
9 | N023901 | 1.15 | 0.36 | 0.23 | † | † | † | † | |
RC | 1 | N024001 | 1.37 | 0.40 | 0.29 | † | † | † | † |
2 | N024002 | 1.38 | -0.47 | 0.28 | † | † | † | † | |
3 | N021801 | 0.88 | -1.12 | 0.27 | † | † | † | † | |
4 | N021802 | 0.75 | 0.58 | 0.34 | † | † | † | † | |
5 | N021803 | 0.29 | -0.42 | † | 3.01 | -2.42 | -0.59 | † | |
6 | N022001 | 1.41 | -1.06 | 0.31 | † | † | † | † | |
7 | N022002 | 1.16 | -1.27 | 0.26 | † | † | † | † | |
8 | N022003 | 1.10 | -0.75 | 0.33 | † | † | † | † | |
9 | N022004 | 1.83 | -1.05 | 0.26 | † | † | † | † | |
10 | N023601 | 1.10 | -1.62 | 0.29 | † | † | † | † | |
11 | N023602 | 0.71 | -2.33 | 0.24 | † | † | † | † | |
RD | 1 | N024101 | 0.65 | -0.52 | 0.29 | † | † | † | † |
2 | N024102 | 1.55 | 0.64 | 0.20 | † | † | † | † | |
3 | N024103 | 0.98 | 0.38 | 0.27 | † | † | † | † | |
4 | N024104 | 0.40 | -0.17 | 0.25 | † | † | † | † | |
5 | N022101 | 1.54 | -1.17 | 0.37 | † | † | † | † | |
6 | N022102 | 1.38 | 0.20 | 0.17 | † | † | † | † | |
7 | N022103 | 0.57 | 0.57 | † | 1.99 | 0.17 | -2.16 | † | |
8 | N024201 | 1.05 | -1.06 | 0.33 | † | † | † | † | |
9 | N024202 | 0.91 | -0.47 | 0.26 | † | † | † | † | |
10 | N024203 | 1.05 | -0.60 | 0.23 | † | † | † | † | |
11 | N024204 | 0.49 | -1.30 | 0.22 | † | † | † | † | |
RE | 1 | N024301 | 1.21 | 0.76 | 0.21 | † | † | † | † |
2 | N024302 | 0.63 | -0.07 | 0.26 | † | † | † | † | |
3 | N022401 | 2.19 | -0.25 | 0.48 | † | † | † | † | |
4 | N022402 | 1.75 | -0.22 | 0.19 | † | † | † | † | |
5 | N022403 | 2.32 | -0.04 | 0.29 | † | † | † | † | |
6 | N022404 | 3.16 | 0.03 | 0.19 | † | † | † | † | |
7 | N022405 | 0.68 | -0.37 | † | -0.54 | 1.82 | -1.28 | † | |
8 | N024401 | 0.78 | -1.41 | 0.24 | † | † | † | † | |
9 | N024402 | 0.98 | -0.36 | 0.13 | † | † | † | † | |
10 | N024403 | 1.27 | -0.51 | 0.25 | † | † | † | † | |
RF | 1 | N024501 | 1.02 | -0.65 | 0.39 | † | † | † | † |
2 | N024502 | 0.68 | -0.42 | 0.18 | † | † | † | † | |
3 | N024503 | 1.16 | 0.42 | 0.27 | † | † | † | † | |
5 | N024601 | 0.84 | -0.69 | 0.26 | † | † | † | † | |
6 | N024602 | 1.19 | -1.38 | 0.30 | † | † | † | † | |
7 | N024603 | 1.21 | -0.97 | 0.31 | † | † | † | † | |
8 | N024604 | 1.31 | -1.27 | 0.30 | † | † | † | † | |
9 | N024605 | 0.87 | -0.83 | 0.27 | † | † | † | † | |
10 | N024701 | 1.11 | -0.81 | 0.23 | † | † | † | † | |
11 | N024801 | 0.85 | -1.84 | 0.24 | † | † | † | † | |
12 | N024802 | 1.07 | -1.18 | 0.22 | † | † | † | † | |
13 | N024803 | 0.67 | -0.29 | 0.19 | † | † | † | † | |
14 | N022901 | 0.55 | -2.86 | 0.26 | † | † | † | † | |
RG | 1 | N024901 | 0.64 | -0.28 | 0.18 | † | † | † | † |
2 | N024902 | 0.81 | -1.71 | 0.39 | † | † | † | † | |
3 | N024903 | 0.87 | -1.83 | 0.29 | † | † | † | † | |
4 | N025001 | 0.74 | -0.57 | 0.33 | † | † | † | † | |
5 | N025002 | 1.11 | -1.11 | 0.26 | † | † | † | † | |
6 | N025003 | 0.80 | -0.55 | 0.19 | † | † | † | † | |
7 | N025101 | 0.59 | 0.50 | 0.32 | † | † | † | † | |
8 | N022301 | 1.82 | -0.88 | 0.26 | † | † | † | † | |
9 | N025201 | 1.20 | -0.35 | 0.26 | † | † | † | † | |
10 | N025202 | 0.79 | -0.02 | 0.33 | † | † | † | † | |
11 | N025301 | 0.87 | 0.20 | 0.27 | † | † | † | † | |
RH | 1 | N026101 | 1.05 | -0.36 | 0.30 | † | † | † | † |
2 | N026102 | 0.79 | -0.29 | 0.32 | † | † | † | † | |
3 | N027301 | 1.11 | -0.10 | 0.38 | † | † | † | † | |
4 | N027302 | 0.37 | 0.46 | † | 3.31 | 1.26 | 0.79 | -5.36 | |
5 | N027401 | 1.15 | -0.49 | 0.26 | † | † | † | † | |
6 | N027402 | 1.42 | 0.07 | 0.16 | † | † | † | † | |
7 | N027403 | 0.48 | -0.17 | 0.23 | † | † | † | † | |
8 | N027404 | 1.42 | -0.45 | 0.25 | † | † | † | † | |
9 | N027405 | 0.99 | -1.31 | 0.34 | † | † | † | † | |
10 | N025901 | 0.94 | -1.31 | 0.26 | † | † | † | † | |
RI | 1 | N028701 | 1.15 | -1.34 | 0.26 | † | † | † | † |
2 | N028702 | 1.11 | -1.17 | 0.27 | † | † | † | † | |
3 | N028703 | 0.64 | -1.21 | 0.21 | † | † | † | † | |
4 | N028704 | 1.60 | -1.82 | 0.30 | † | † | † | † | |
5 | N028801 | 0.69 | -1.57 | 0.25 | † | † | † | † | |
6 | N028802 | 1.07 | -0.70 | 0.28 | † | † | † | † | |
7 | N029001 | 0.81 | 0.18 | 0.20 | † | † | † | † | |
8 | N029002 | 0.66 | 0.22 | † | 2.20 | -0.63 | -1.56 | † | |
9 | N028901 | 0.72 | -0.95 | 0.24 | † | † | † | † | |
10 | N028902 | 0.89 | 0.22 | 0.28 | † | † | † | † | |
RJ | 1 | N027701 | 0.94 | -1.86 | 0.20 | † | † | † | † |
2 | N027702 | 0.95 | -0.56 | 0.23 | † | † | † | † | |
3 | N027801 | 0.58 | -1.78 | 0.24 | † | † | † | † | |
4 | N027802 | 1.61 | -0.89 | 0.23 | † | † | † | † | |
5 | N027803 | 1.02 | -0.31 | 0.25 | † | † | † | † | |
6 | N027804 | 0.75 | -0.23 | 0.14 | † | † | † | † | |
8 | N027901 | 0.53 | -0.28 | 0.37 | † | † | † | † | |
9 | N027902 | 1.11 | -0.93 | 0.28 | † | † | † | † | |
10 | N027903 | 0.91 | -0.29 | 0.31 | † | † | † | † | |
11 | N027904 | 0.88 | -0.39 | 0.24 | † | † | † | † |