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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Science Assessment IRT Parameters → IRT Parameters for Items in the Earth and Space Sciences Scale, Grade 4 Science Combined National and State Main Assessment, by Item and Block: 2009

NAEP Technical DocumentationIRT parameters for items in the earth and space sciences scale, grade 4 science combined national and state main assessment, by item and block: 2009
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
† Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models.
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 represents the category threshold parameter for category i. The c parameter value is exactly zero for items scaled with the two-parameter logistic model. For item j, dji may not sum to zero because of rounding.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Science Assessment.
S3 1 K080101 0.67 -0.46 0.23 † † † †
10 K153001 0.60 1.42 † 0.90 -0.90 † †
11 K080601 0.86 0.62 0.21 † † † †
14 K080801 0.66 -1.49 0.28 † † † †
15 K106701 0.49 0.97 † 1.01 -1.01 † †
S4 1 K079001 1.19 -0.26 0.31 † † † †
2 K078801 0.46 0.35 0.27 † † † †
9 K079301 0.41 0.34 0.17 † † † †
10 K079501 0.31 0.75 † 2.03 -0.04 -1.99 †
S5 1 K086101 0.70 -0.79 0.36 † † † †
10 K0855CL 0.44 -0.98 † 0.43 0.98 -0.02 -1.38
11 K082301 0.97 0.85 0.11 † † † †
15 K082601 2.23 1.17 0.26 † † † †
S6 1 K107301 0.70 -1.97 0.18 † † † †
3 K108001 1.40 0.69 0.20 † † † †
7 K086801 0.77 -0.47 0.39 † † † †
9 K081701 0.79 -0.42 0.13 † † † †
10 K076501 0.49 0.19 † 0.89 -0.89 † †
12 K087501 1.02 0.79 0.28 † † † †
16 K087901 1.06 -1.35 0.16 † † † †
S7 2 K085001 0.77 -1.72 0.19 † † † †
5 K076302 0.75 0.53 † † † † †
8 K076901 0.55 1.12 † -0.15 0.15 † †
9 K076401 0.60 3.07 0.39 † † † †
15 K085101 0.79 -0.40 0.33 † † † †
16 K080401 1.42 1.28 0.38 † † † †
S8 2 K109901 0.56 -0.10 0.20 † † † †
6 K077701 0.42 -0.20 † -0.27 0.27 † †
13 K1097CL 0.40 1.27 † 3.10 1.11 -3.66 -0.56
S9 3 K088201 0.58 1.31 0.37 † † † †
4 K088202 1.04 2.00 0.22 † † † †
8 K084601 0.53 -0.64 0.16 † † † †
13 K089001 1.91 1.53 0.36 † † † †
15 K089201 0.62 1.51 0.26 † † † †
16 K078401 0.61 1.32 0.17 † † † †
S10 4 K153901 0.59 3.83 0.26 † † † †
7 K083301 0.60 -0.14 0.24 † † † †
11 K081301 2.04 1.70 0.31 † † † †
16 K081401 1.18 1.09 0.34 † † † †
17 K154201 0.97 -0.03 0.27 † † † †
S11 2 K154301 1.21 1.36 0.15 † † † †
4 K089502 0.64 -0.23 † † † † †
10 K106601 1.21 0.51 0.26 † † † †
11 K106603 0.96 1.12 † -0.14 0.14 † †
12 K106604 1.08 0.53 0.32 † † † †
15 K107201 0.73 -0.28 0.25 † † † †
Last updated 03 June 2016 (GF)