Table of Contents | Search Technical Documentation | References
Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 |
---|---|---|---|---|---|---|---|---|
S4 | 1 | K031101 | 0.57 | -1.44 | 0.00 | † | † | † |
2 | K031102 | 0.49 | -1.05 | 0.00 | † | † | † | |
3 | K031103 | 0.45 | -0.09 | 0.00 | † | † | † | |
4 | K031104 | 0.42 | -2.53 | 0.00 | † | † | † | |
5 | K031105 | 0.80 | 2.71 | 0.00 | † | † | † | |
6 | K031106 | 0.81 | 2.00 | 0.15 | † | † | † | |
7 | K031107 | 0.71 | 1.41 | 0.00 | -0.08 | 0.08 | † | |
S6 | 6 | K031309 | 1.13 | -0.46 | 0.00 | † | † | † |
7 | K031302 | 0.53 | 3.46 | 0.00 | 0.92 | -0.92 | † | |
8 | K031303 | 0.91 | -0.11 | 0.00 | 0.47 | -0.47 | † | |
9 | K031304 | 0.54 | -0.67 | 0.00 | 0.50 | -0.50 | † | |
S10 | 4 | K032001 | 0.41 | 0.38 | 0.00 | 0.97 | -0.97 | † |
5 | K032101 | 1.11 | 0.34 | 0.25 | † | † | † | |
S11 | 3 | K097501 | 0.76 | 0.68 | 0.26 | † | † | † |
7 | K098301 | 0.69 | 1.21 | 0.00 | 1.97 | -1.97 | † | |
8 | K097101 | 0.65 | 1.12 | 0.30 | † | † | † | |
10 | K098201 | 0.26 | 0.64 | 0.00 | † | † | † | |
12 | K097401 | 0.61 | 1.64 | 0.10 | † | † | † | |
S12 | 5 | K034001 | 0.61 | 1.90 | 0.00 | -0.33 | 0.33 | † |
7 | K034201 | 1.11 | 0.18 | 0.21 | † | † | † | |
8 | K034301 | 0.95 | 0.27 | 0.21 | † | † | † | |
S13 | 3 | K034801 | 1.36 | 0.69 | 0.29 | † | † | † |
4 | K034802 | 0.67 | 0.12 | 0.00 | † | † | † | |
5 | K034901 | 0.30 | -1.96 | 0.00 | 0.06 | -0.06 | † | |
6 | K034902 | 0.57 | 0.79 | 0.00 | -0.32 | 0.32 | † | |
S14 | 1 | K035401 | 0.64 | 2.68 | 0.39 | † | † | † |
3 | K035601 | 0.31 | 3.37 | 0.00 | 1.62 | -1.62 | † | |
4 | K035701 | 0.99 | 1.31 | 0.24 | † | † | † | |
5 | K035801 | 0.59 | 0.71 | 0.00 | -0.16 | 0.16 | † | |
9 | K036201 | 1.27 | 1.50 | 0.12 | † | † | † | |
10 | K036301 | 0.64 | 1.48 | 0.00 | -0.91 | 0.91 | † | |
S15 | 4 | K037301 | 0.46 | 2.01 | 0.00 | -2.11 | 2.11 | † |
6 | K037501 | 0.91 | 2.80 | 0.00 | -0.40 | 0.40 | † | |
8 | K037701 | 0.34 | -1.56 | 0.00 | 1.38 | 0.75 | -2.13 | |
9 | K037702 | 0.72 | 1.33 | 0.00 | 0.15 | -0.15 | † | |
S20 | 5 | K096901 | 0.52 | 0.91 | 0.00 | -1.15 | 1.15 | † |
6 | K097201 | 0.78 | 0.82 | 0.14 | † | † | † | |
9 | K098401 | 0.56 | 1.72 | 0.00 | 0.70 | -0.70 | † | |
10 | K100801 | 1.01 | 0.71 | 0.41 | † | † | † | |
11 | K100701 | 0.56 | 0.88 | 0.00 | -1.33 | 1.33 | † | |
14 | K097301 | 1.10 | 1.23 | 0.23 | † | † | † | |
S21 | 1 | K039501 | 1.05 | -0.32 | 0.25 | † | † | † |
3 | K039701 | 0.49 | 2.69 | 0.27 | † | † | † | |
6 | K040001 | 0.44 | 0.80 | 0.00 | -0.56 | 0.56 | † | |
7 | K040101 | 1.38 | 0.03 | 0.26 | † | † | † | |
9 | K040301 | 0.26 | 2.38 | 0.00 | 0.33 | -0.33 | † | |
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. 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 or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Science Assessment. |