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Item | NAEP ID | a | b | c | d | d | d | |
---|---|---|---|---|---|---|---|---|
Not applicable; c parameters are not estimated for the two-parameter logistic or generalized partial credit models, and d parameters are not estimated for the two-parameter or three-parameter logistic models. | ||||||||
For item j, a represents the discriminatory power of the item, b represents a location parameter related to item difficulty, c represents the guessing parameter, and d represents the category threshold parameter for category i. The c parameter value is assumed to be exactly zero and is not estimated for items scaled with the two-parameter logistic model. For item j, d may not sum to zero because of rounding. | ||||||||
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Mathematics Assessment. | ||||||||
Block M1 | ||||||||
1 | M390401 | 0.46 | -2.74 | 0.13 | ||||
3 | M245401 | 0.54 | -1.32 | |||||
5 | M246101 | 1.08 | -1.78 | 0.17 | ||||
8 | M243901 | 0.44 | -1.78 | |||||
10 | M3748MS | 0.52 | -0.57 | -1.03 | 1.03 | |||
13 | M3945MS | 0.52 | 1.38 | |||||
17 | M373101 | 0.62 | 1.12 | -3.37 | 3.37 | |||
Block M2 | ||||||||
2 | M3762MS | 0.85 | -2.65 | |||||
5 | M147201 | 0.53 | -2.09 | 0.18 | ||||
7 | M4188MS | 0.71 | -1.34 | |||||
9 | M341301 | 0.64 | -1.43 | 0.12 | ||||
11 | M3733MS | 0.72 | -1.11 | |||||
13 | M240101 | 1.03 | -0.58 | 0.25 | ||||
Block M3 | ||||||||
3 | M3690MS | 0.87 | -1.39 | |||||
5 | M370401 | 0.72 | -0.43 | |||||
8 | M3738MS | 0.98 | 1.45 | |||||
11 | M3728MS | 0.79 | 0.87 | 0.43 | -0.43 | |||
Block M4 | ||||||||
3 | M147401 | 0.86 | -0.63 | 0.10 | ||||
5 | M340901 | 0.82 | 0.11 | 0.16 | ||||
8 | M219101 | 1.11 | 0.26 | 0.26 | ||||
10 | M343201 | 0.59 | 0.85 | 0.79 | -0.79 | |||
12 | M229701 | 0.68 | 1.65 | 0.25 | ||||
13 | M343001 | 0.96 | 0.14 | |||||
15 | D3444MS | 0.48 | 1.48 | -6.00 | 6.00 | |||
20 | M147701 | 1.82 | 1.25 | 0.19 | ||||
Block M5 | ||||||||
2 | M225401 | 0.90 | -0.03 | 0.21 | ||||
5 | M228601 | 0.87 | -0.73 | 0.27 | ||||
7 | M225101 | 1.04 | 0.77 | 0.15 | ||||
8 | M229301 | 1.75 | 0.29 | 0.15 | ||||
11 | M338601 | 1.05 | 0.18 | 0.17 | ||||
14 | M338801 | 1.29 | 1.49 | |||||
16 | M338901 | 1.09 | 0.36 | 0.25 | ||||
19 | M147901 | 1.31 | 0.73 | 0.17 | ||||
Block M6 | ||||||||
6 | M220201 | 0.62 | -1.38 | 0.34 | ||||
8 | M220501 | 0.97 | 1.21 | 0.33 | ||||
9 | M219501 | 0.54 | 0.23 | -0.33 | 0.33 | |||
11 | M220701 | 0.27 | -0.35 | -4.43 | 4.43 | |||
12 | M220801 | 1.80 | 1.22 | 0.07 | ||||
13 | M220901 | 1.95 | 1.19 | 0.28 | ||||
16 | M221001 | 1.05 | 0.19 | 0.26 | ||||
20 | M344201 | 0.92 | 0.14 | 0.17 | ||||
Block M7 | ||||||||
1 | M158001 | 1.15 | 0.27 | 0.27 | ||||
3 | M161101 | 0.89 | -0.93 | 0.17 | ||||
6 | D1616MS | 0.91 | 0.45 | |||||
8 | M159701 | 0.88 | -1.29 | 0.15 | ||||
10 | M155201 | 0.77 | -0.79 | 0.29 | ||||
15 | M226701 | 1.56 | 1.67 | 0.26 | ||||
17 | M148001 | 1.83 | 1.37 | 0.17 | ||||
Block M8 | ||||||||
2 | M375101 | 0.78 | 1.17 | |||||
8 | M375401 | 0.47 | 0.38 | |||||
10 | M376101 | 0.57 | 1.06 | 0.87 | -0.87 | |||
12 | M3785MS | 0.61 | 1.45 | 0.57 | -0.57 | |||
15 | M377101 | 2.72 | 1.92 | 0.15 | ||||
Block M9 | ||||||||
1 | M247301 | 0.77 | -1.49 | 0.29 | ||||
4 | M3709MS | 0.90 | -1.15 | |||||
6 | M3921MS | 0.78 | -0.37 | |||||
8 | M230801 | 1.46 | -0.39 | 0.29 | ||||
10 | M399901 | 0.85 | 0.62 | |||||
12 | M399001 | 0.69 | 0.74 | 0.71 | -0.71 | |||
Block M10 | ||||||||
1 | M223901 | 0.86 | -1.50 | 0.09 | ||||
2 | M339001 | 0.62 | -1.29 | 0.11 | ||||
7 | M240801 | 0.93 | 0.37 | |||||
9 | M224801 | 0.88 | -0.51 | 0.11 | ||||
11 | M339301 | 1.28 | 0.46 | 0.18 | ||||
12 | M228501 | 1.26 | 0.58 | 0.22 | ||||
16 | M240901 | 1.16 | 0.26 | 0.22 | ||||
20 | M147501 | 1.19 | -0.42 | 0.23 | ||||
Block M11 | ||||||||
1 | D2437MS | 0.57 | -2.52 | |||||
3 | M391901 | 0.69 | -1.70 | |||||
5 | M243801 | 1.09 | -1.41 | 0.11 | ||||
7 | M342701 | 1.26 | -0.97 | 0.20 | ||||
10 | M3683MS | 0.97 | -0.81 | |||||
12 | M3702CL | 0.75 | 0.91 | 0.87 | -0.87 | |||
Block M12 | ||||||||
1 | M243101 | 1.00 | -2.59 | 0.21 | ||||
4 | M244601 | 0.98 | -1.79 | 0.10 | ||||
6 | M368101 | 0.75 | -1.31 | 0.12 | ||||
8 | M229901 | 0.93 | -0.81 | 0.27 | ||||
11 | M392401 | 1.06 | -0.82 | 0.14 | ||||
13 | M3776MS | 0.83 | -1.08 | |||||
16 | M397901 | 1.05 | 1.62 | |||||
Block M13 | ||||||||
1 | M399701 | 0.99 | -1.84 | 0.14 | ||||
5 | M4001MS | 1.07 | -0.09 | |||||
9 | M401201 | 0.68 | 0.49 | |||||
11 | M247201 | 1.11 | 0.34 | 0.21 | ||||
13 | M4194MS | 0.67 | 1.18 | |||||
16 | M3933CL | 0.85 | 1.83 | -0.16 | -0.18 | 0.33 | ||
Block M14 | ||||||||
1 | M246401 | 0.68 | -2.45 | 0.16 | ||||
3 | M398101 | 1.03 | -0.47 | |||||
8 | M372001 | 1.58 | 0.11 | 0.18 | ||||
10 | M3789MS | 0.72 | 0.22 | |||||
12 | M4023CL | 0.73 | 0.92 | -0.01 | -0.58 | 0.59 | ||
15 | M402601 | 1.25 | 1.21 | 0.26 | ||||
17 | M3983MS | 0.79 | 1.40 | -0.61 | 0.61 |