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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Science Assessment IRT Parameters → IRT Parameters for the Physical Science Scale, by Block and Item, Grade 4 Science National Main Assessment (Accommodations Permitted [R3]): 2000
NAEP Technical DocumentationIRT parameters for the physical science scale, by block and item, grade 4 science national main assessment (accommodations permitted [R3]): 2000
Block Item NAEP ID aj bj cj dj1 dj2 dj3
S4 1 K031101 0.58 -1.50 0.00 † † †
2 K031102 0.54 -0.95 0.00 † † †
3 K031103 0.48 -0.12 0.00 † † †
4 K031104 0.67 -2.06 0.00 † † †
5 K031105 0.78 2.68 0.00 † † †
6 K031106 0.76 2.25 0.17 † † †
7 K031107 0.60 1.51 0.00 -0.31 0.31 †
S6 6 K031309 0.89 -0.52 0.00 † † †
7 K031302 0.60 3.05 0.00 0.55 -0.55 †
8 K031303 0.98 -0.05 0.00 0.54 -0.54 †
9 K031304 0.58 -0.57 0.00 0.55 -0.55 †
S10 4 K032001 0.48 0.24 0.00 1.01 -1.01 †
5 K032101 0.75 0.19 0.19 † † †
S11 3 K097501 0.97 0.63 0.28 † † †
7 K098301 0.61 1.17 0.00 2.13 -2.13 †
8 K097101 0.43 0.77 0.23 † † †
10 K098201 0.26 0.81 0.00 † † †
12 K097401 1.41 1.22 0.19 † † †
S12 5 K034001 0.61 1.78 0.00 -0.15 0.15 †
7 K034201 0.90 0.08 0.20 † † †
8 K034301 0.83 0.32 0.21 † † †
S13 3 K034801 0.88 0.54 0.25 † † †
4 K034802 0.76 0.14 0.00 † † †
5 K034901 0.28 -2.01 0.00 -0.03 0.03 †
6 K034902 0.61 0.78 0.00 -0.27 0.27 †
S14 1 K035401 0.28 2.83 0.27 † † †
3 K035601 0.29 3.51 0.00 1.62 -1.62 †
4 K035701 0.86 1.18 0.20 † † †
5 K035801 0.59 0.67 0.00 -0.05 0.05 †
9 K036201 0.70 1.81 0.08 † † †
10 K036301 0.59 1.42 0.00 -1.02 1.02 †
S15 4 K037301 0.46 1.97 0.00 -2.13 2.13 †
6 K037501 0.61 3.93 0.00 -0.30 0.30 †
8 K037701 0.34 -1.55 0.00 1.27 0.95 -2.22
9 K037702 0.68 1.33 0.00 0.18 -0.18 †
S20 5 K096901 0.52 0.88 0.00 -1.37 1.37 †
6 K097201 0.91 0.85 0.18 † † †
9 K098401 0.57 1.79 0.00 0.60 -0.60 †
10 K100801 0.66 0.16 0.25 † † †
11 K100701 0.56 0.90 0.00 -1.27 1.27 †
14 K097301 0.80 1.07 0.20 † † †
S21 1 K039501 1.00 -0.45 0.28 † † †
3 K039701 0.70 1.86 0.23 † † †
6 K040001 0.40 0.78 0.00 -0.68 0.68 †
7 K040101 1.07 -0.09 0.30 † † †
9 K040301 0.28 2.19 0.00 0.22 -0.22 †
† 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.
Last updated 14 July 2008 (DR)

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