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Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 |
---|---|---|---|---|---|---|---|---|---|
M3 | 8 | M039701 | 0.91 | 1.06 | 0.16 | † | † | † | † |
M4 | 10 | M018301 | 1.43 | 0.86 | 0.13 | † | † | † | † |
14 | M018701 | 1.36 | 1.99 | 0.17 | † | † | † | † | |
M5 | 3 | M066201 | 1.14 | 0.10 | 0.20 | † | † | † | † |
4A | M066301 | 0.42 | -0.27 | 0.00 | -2.20 | 2.20 | † | † | |
6A | M066501 | 0.71 | 0.71 | 0.00 | -0.37 | 0.37 | † | † | |
7A | M066601 | 0.66 | 0.77 | 0.00 | 0.23 | -0.23 | † | † | |
M6 | 1A | M019701 | 0.57 | -0.41 | 0.00 | † | † | † | † |
8A | M020401 | 0.57 | 0.07 | 0.00 | † | † | † | † | |
M7 | 2 | M067701 | 1.03 | 0.02 | 0.23 | † | † | † | † |
4A | M067901 | 0.54 | 0.97 | 0.00 | -1.88 | 1.88 | † | † | |
M8 | 4A | M010331 | 0.97 | 0.17 | 0.32 | † | † | † | † |
M9 | 6 | M091001 | 0.68 | -0.48 | 0.13 | † | † | † | † |
7A | M091101 | 0.40 | 0.04 | 0.00 | -0.23 | 0.23 | † | † | |
M12 | 5A | M086801 | 0.69 | -0.33 | 0.21 | † | † | † | † |
9A | M087201 | 1.05 | 2.06 | 0.24 | † | † | † | † | |
M13 | 12A | M043501 | 0.31 | 1.16 | 0.00 | 0.79 | 0.02 | -0.11 | † |
M14 | 4A | M072201 | 0.39 | -0.54 | 0.00 | -8.38 | 8.38 | † | † |
5A | M072202 | 0.86 | 0.69 | 0.00 | -0.19 | 0.19 | † | † | |
10A | M072701 | 0.36 | 1.75 | 0.00 | 0.30 | -0.03 | -0.27 | † | |
M15 | 3 | M074401 | 0.76 | 0.75 | 0.24 | † | † | † | † |
† 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 Mathematics Assessment. |