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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 Earth Science Scale, by Block and Item, Grade 4 Science National Main Assessment (Accommodations Not Permitted [R2]): 2000
NAEP Technical DocumentationIRT parameters for the earth science scale, by block and item, grade 4 science national main assessment (accommodations not permitted [R2]): 2000
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
S7 1 K031401 0.26 3.81 0.00 3.18 0.08 -3.26 †
2 K031402 0.69 1.04 0.00 † † † †
3 K031403 0.71 -0.45 0.00 0.60 -0.60 † †
4 K031404 1.05 -0.39 0.00 † † † †
5 K031405 0.90 2.30 0.18 † † † †
6 K031406 0.65 0.32 0.41 † † † †
7 K031407 0.44 -1.02 0.00 † † † †
8 K031408 0.65 -0.02 0.00 0.59 -0.59 † †
9 K031409 0.93 0.08 0.00 † † † †
10 K031410 0.39 0.69 0.00 0.72 -0.72 † †
S10 2 K031801 0.63 0.72 0.14 † † † †
3 K031901 0.51 -0.17 0.00 0.62 -0.62 † †
6 K032201 0.97 0.33 0.15 † † † †
7 K032301 0.89 1.53 0.17 † † † †
8 K032401 1.15 1.15 0.17 † † † †
S11 2 K099501 0.28 2.05 0.00 2.01 -2.01 † †
4 K090001 1.75 1.55 0.19 † † † †
6 K099301 0.70 -0.65 0.18 † † † †
9 K098701 1.31 0.37 0.18 † † † †
13 K099801 0.54 -0.41 0.20 † † † †
14 K099901 0.35 2.44 0.20 † † † †
S12 1 K033601 0.50 -2.14 0.22 † † † †
2 K033701 0.56 -0.97 0.19 † † † †
3 K033801 0.90 -0.23 0.20 † † † †
9 K034401 0.44 0.19 0.00 0.68 -0.68 † †
10 K034501 0.57 1.10 0.00 1.95 -1.88 -0.07 †
11 K034502 0.39 1.79 0.00 -0.78 0.78 † †
6 K2341CL 0.44 1.28 0.00 0.56 2.07 0.11 -2.74
S13 7 K035001 0.76 -0.33 0.34 † † † †
8 K035101 0.51 1.23 0.19 † † † †
9 K034102 0.66 -1.72 0.18 † † † †
10 K035201 0.78 0.92 0.00 † † † †
11 K035301 0.60 0.60 0.00 2.57 -0.81 -1.77 †
S14 7 K036001 0.54 2.69 0.26 † † † †
8 K036101 0.67 1.34 0.00 1.19 -1.19 † †
S15 5 K037401 0.82 2.69 0.00 0.00 -0.00 † †
7 K037601 0.63 1.86 0.00 0.59 -0.59 † †
S20 2 K094201 0.25 -1.79 0.22 † † † †
3 K099401 0.26 -0.64 0.24 † † † †
8 K094701 0.63 1.20 0.20 † † † †
12 K099601 0.43 0.79 0.00 0.86 -0.86 † †
13 K094301 0.44 1.99 0.22 † † † †
S21 2 K039601 0.86 -0.93 0.16 † † † †
4 K039801 0.52 -1.30 0.00 1.23 -1.23 † †
10 K040401 0.40 1.97 0.00 -2.68 2.56 0.12 †
11 K040501 0.77 0.72 0.00 † † † †
† 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 16 July 2008 (DR)

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