Table of Contents | Search Technical Documentation | References
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. # Rounds to zero. 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), 2004 Reading Long-Term Trend Assessment. |
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H | 2 | N008601 | 1.54 | -0.22 | 0.25 | † | † | † | † |
3 | N008602 | 1.15 | -0.05 | 0.24 | † | † | † | † | |
4 | N008603 | 1.09 | -0.36 | 0.25 | † | † | † | † | |
5 | N008701 | 0.55 | -3.15 | 0.26 | † | † | † | † | |
6 | N001521 | 1.90 | -0.79 | 0.34 | † | † | † | † | |
7 | N001522 | 1.85 | 0.36 | 0.23 | † | † | † | † | |
8 | N001523 | 1.36 | -0.40 | 0.30 | † | † | † | † | |
9 | N001524 | 1.89 | 0.40 | 0.24 | † | † | † | † | |
10 | N001527 | 1.11 | 1.96 | 0.00 | † | † | † | † | |
J | 1 | N001601 | 0.63 | 0.26 | 0.22 | † | † | † | † |
2 | N001602 | 1.24 | 0.48 | 0.27 | † | † | † | † | |
3 | N001603 | 0.75 | 1.10 | 0.30 | † | † | † | † | |
4 | N001604 | 1.10 | 0.92 | 0.25 | † | † | † | † | |
5 | N008801 | 1.14 | -1.01 | 0.26 | † | † | † | † | |
7 | N001802 | 1.06 | 2.41 | 0.21 | † | † | † | † | |
8 | N008901 | 1.59 | -0.27 | 0.21 | † | † | † | † | |
9 | N008902 | 1.02 | -0.42 | 0.23 | † | † | † | † | |
K | 1 | N002001 | 1.62 | 1.03 | 0.19 | † | † | † | † |
2 | N002002 | 1.40 | 0.66 | 0.18 | † | † | † | † | |
3 | N002003 | 1.36 | 0.54 | 0.26 | † | † | † | † | |
4 | N009001 | 1.43 | 0.55 | 0.19 | † | † | † | † | |
5 | N009002 | 0.99 | 0.67 | 0.19 | † | † | † | † | |
6 | N009003 | 1.61 | 1.27 | 0.22 | † | † | † | † | |
7 | N009004 | 1.51 | 0.39 | 0.24 | † | † | † | † | |
8 | N009101 | 0.88 | -0.74 | 0.26 | † | † | † | † | |
9 | N009201 | 1.20 | -1.05 | 0.26 | † | † | † | † | |
10 | N002101 | 1.05 | 2.31 | 0.23 | † | † | † | † | |
11 | N002102 | 1.27 | 2.16 | 0.18 | † | † | † | † | |
L | 1 | N002702 | 1.68 | 0.80 | 0.22 | † | † | † | † |
2 | N009601 | 0.77 | -1.32 | 0.20 | † | † | † | † | |
3 | N002401 | 1.35 | 0.79 | 0.16 | † | † | † | † | |
4 | N009401 | 1.30 | -0.57 | 0.18 | † | † | † | † | |
5 | N002801 | 2.08 | 0.21 | 0.23 | † | † | † | † | |
6 | N002802 | 1.56 | -0.04 | 0.23 | † | † | † | † | |
7 | N002804 | 0.69 | 1.46 | 0.00 | † | † | † | † | |
M | 1 | N009701 | 0.95 | 0.18 | 0.25 | † | † | † | † |
2 | N009702 | 1.92 | 0.14 | 0.28 | † | † | † | † | |
3 | N009703 | 1.39 | 0.69 | 0.25 | † | † | † | † | |
4 | N009704 | 1.08 | 0.75 | 0.19 | † | † | † | † | |
5 | N009705 | 1.83 | 0.13 | 0.25 | † | † | † | † | |
6 | N003001 | 0.89 | 2.15 | 0.20 | † | † | † | † | |
7 | N003002 | 0.56 | 0.74 | 0.25 | † | † | † | † | |
9 | N014001 | 1.05 | 0.03 | 0.27 | † | † | † | † | |
10 | N003101 | 1.06 | 0.27 | 0.27 | † | † | † | † | |
11 | N003102 | 1.87 | 0.86 | 0.19 | † | † | † | † | |
12 | N003104 | 1.00 | 2.45 | 0.00 | † | † | † | † | |
N | 1 | N009801 | 1.01 | -1.76 | 0.27 | † | † | † | † |
2 | N009901 | 0.89 | 0.17 | 0.29 | † | † | † | † | |
3 | N014301 | 1.95 | 0.24 | 0.25 | † | † | † | † | |
4 | N014302 | 1.40 | 0.45 | 0.24 | † | † | † | † | |
5 | N014303 | 2.10 | # | 0.28 | † | † | † | † | |
6 | N010002 | 1.43 | # | 0.27 | † | † | † | † | |
7 | N010003 | 1.36 | 0.30 | 0.22 | † | † | † | † | |
8 | N010102 | 1.32 | 0.90 | 0.31 | † | † | † | † | |
9 | N010103 | 1.92 | 0.03 | 0.26 | † | † | † | † | |
10 | N003701 | 1.46 | 0.19 | 0.40 | † | † | † | † | |
11 | N003702 | 1.83 | 0.49 | 0.25 | † | † | † | † | |
12 | N003704 | 0.90 | 1.08 | 0.00 | † | † | † | † | |
O | 1 | N003801 | 1.01 | 1.42 | 0.31 | † | † | † | † |
2 | N003802 | 0.49 | 0.46 | 0.24 | † | † | † | † | |
3 | N003803 | 0.93 | 2.39 | 0.21 | † | † | † | † | |
4 | N010301 | 0.71 | -1.15 | 0.25 | † | † | † | † | |
5 | N010201 | 0.92 | -1.20 | 0.26 | † | † | † | † | |
6 | N004101 | 0.92 | -0.22 | 0.30 | † | † | † | † | |
7 | N004201 | 1.13 | 1.03 | 0.22 | † | † | † | † | |
8 | N004202 | 0.79 | 1.70 | 0.33 | † | † | † | † | |
9 | N010401 | 0.56 | -1.17 | 0.28 | † | † | † | † | |
10 | N010402 | 0.97 | 1.16 | 0.25 | † | † | † | † | |
11 | N010403 | 1.61 | 1.39 | 0.20 | † | † | † | † | |
Q | 1 | N004701 | 1.85 | 0.40 | 0.20 | † | † | † | † |
2 | N004702 | 0.73 | -0.13 | 0.28 | † | † | † | † | |
3 | N004703 | 1.91 | 0.29 | 0.27 | † | † | † | † | |
4 | N004801 | 1.01 | -0.49 | 0.31 | † | † | † | † | |
5 | N004901 | 1.31 | 1.15 | 0.21 | † | † | † | † | |
6 | N005101 | 0.74 | -1.71 | 0.26 | † | † | † | † | |
7 | N010801 | 1.04 | 0.41 | 0.26 | † | † | † | † | |
8 | N010902 | 2.31 | 0.61 | 0.34 | † | † | † | † | |
9 | N010903 | 2.31 | 0.30 | 0.26 | † | † | † | † | |
10 | N010904 | 1.90 | 0.56 | 0.24 | † | † | † | † | |
11 | N014101 | 0.68 | -0.05 | 0.23 | † | † | † | † | |
R | 1 | N011001 | 1.29 | 0.25 | 0.28 | † | † | † | † |
2 | N011002 | 1.83 | 0.55 | 0.25 | † | † | † | † | |
3 | N011003 | 1.97 | -0.16 | 0.29 | † | † | † | † | |
4 | N011004 | 2.22 | 0.29 | 0.25 | † | † | † | † | |
5 | N011101 | 1.62 | 0.27 | 0.21 | † | † | † | † | |
6 | N011201 | 0.89 | 0.40 | 0.20 | † | † | † | † | |
7 | N011301 | 1.92 | 0.30 | 0.25 | † | † | † | † | |
8 | N011302 | 1.13 | 0.47 | 0.30 | † | † | † | † | |
10 | N011402 | 1.00 | 1.02 | 0.26 | † | † | † | † | |
11 | N011403 | 1.26 | 1.40 | 0.28 | † | † | † | † | |
12 | N011404 | 1.37 | 1.16 | 0.21 | † | † | † | † | |
V | 1 | N013201 | 1.47 | -0.02 | 0.19 | † | † | † | † |
2 | N013301 | 1.10 | -0.88 | 0.28 | † | † | † | † | |
3 | N013401 | 1.23 | 0.70 | 0.16 | † | † | † | † | |
4 | N013402 | 1.99 | 0.12 | 0.34 | † | † | † | † | |
5 | N013403 | 1.81 | 0.50 | 0.23 | † | † | † | † | |
6 | N014201 | 0.95 | -0.41 | 0.19 | † | † | † | † | |
7 | N014501 | 0.69 | -0.46 | 0.00 | † | † | † | † | |
8 | N014502 | 0.66 | -0.67 | 0.00 | † | † | † | † | |
9 | N014503 | 1.04 | -1.01 | 0.00 | † | † | † | † | |
R21 | 1 | N021101 | 1.93 | 0.46 | 0.29 | † | † | † | † |
2 | N021102 | 1.37 | 0.15 | 0.25 | † | † | † | † | |
3 | N021201 | 1.48 | 0.17 | 0.28 | † | † | † | † | |
4 | N021202 | 1.27 | 1.49 | 0.20 | † | † | † | † | |
5 | N021203 | 0.44 | 1.54 | † | 2.58 | 0.47 | -0.72 | -2.32 | |
6 | N021301 | 2.10 | 0.64 | 0.27 | † | † | † | † | |
7 | N021302 | 2.74 | 1.12 | 0.13 | † | † | † | † | |
8 | N021303 | 2.56 | 1.14 | 0.24 | † | † | † | † |