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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Science Assessment Item Response Theory Parameters → IRT Parameters for items in the Physical Science Scale, by Block and Item, Grade 12 Science National Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the physical science scale, by block and item, grade 12 science national main assessment: 2005
Block Item NAEP ID aj bj cj dj1 dj2 dj3
† 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 is 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), 2005 Science Assessment.
S3 2 K049501 0.28 -3.18 † -2.21 -3.13 5.34
4 K049502 0.36 2.29 † -0.72 0.52 0.21
5 K049503 0.86 -0.35 0.00 † † †
S4 1 K096601 0.73 -1.39 0.26 † † †
3 K102601 1.48 0.91 0.24 † † †
4 K102701 0.21 -2.16 0.28 † † †
7 K093401 1.92 0.51 0.23 † † †
12 K093201 0.70 0.33 0.23 † † †
13 K096501 1.30 1.78 † -0.06 0.06 †
15 K096401 2.07 1.64 0.07 † † †
S6 1 K049701 0.38 -0.25 † -1.54 1.54 †
2 K049702 0.69 -0.96 0.00 † † †
3 K049708 1.25 0.06 0.00 † † †
4 K049703 1.12 1.52 0.00 † † †
5 K049704 1.07 -0.63 † 0.83 -0.83 †
6 K049705 0.75 -0.12 † -0.59 0.59 †
7 K049706 1.35 0.13 0.00 † † †
8 K049707 1.28 0.93 † 0.87 -0.87 †
S7 1 K105101 0.80 -0.54 0.34 † † †
2 K105701 1.50 1.22 0.33 † † †
5 K105301 1.45 1.28 0.20 † † †
7 K105501 1.10 1.79 † 0.16 -0.16 †
S10 3 K095701 0.18 2.22 0.29 † † †
8 K096301 0.51 0.78 0.22 † † †
9 K096701 0.59 0.79 0.22 † † †
10 K093301 0.31 1.69 0.30 † † †
11 K098601 0.59 2.26 † 1.03 -1.03 †
12 K093101 0.55 0.87 0.31 † † †
14 K096801 0.90 2.39 0.29 † † †
S11 1 K046801 0.62 -0.24 0.27 † † †
2 K046901 1.08 -0.06 0.32 † † †
4 K047101 1.17 -0.51 0.22 † † †
5 K047201 0.52 -0.02 † -1.37 1.37 †
7 K047401 0.58 0.55 † -0.51 0.51 †
12 K047901 1.25 -0.38 0.00 † † †
14 K105901 1.28 0.34 0.24 † † †
15 K059501 2.12 1.93 0.13 † † †
S12 1 K048201 1.48 -0.40 0.22 † † †
4 K048501 0.98 0.07 0.25 † † †
5 K048601 0.52 0.09 † 1.07 -1.07 †
9 K049001 1.41 1.89 0.00 † † †
10 K049101 0.61 -0.72 0.19 † † †
S13 1 K058601 0.65 -0.68 0.24 † † †
5 K059001 0.55 -2.49 0.00 † † †
6 K059101 0.56 1.34 0.00 † † †
S14 1 K052601 1.02 0.20 0.25 † † †
2 K052701 0.91 1.12 0.24 † † †
7 K053201 1.48 1.19 0.12 † † †
8 K053301 1.85 0.85 0.17 † † †
9 K053401 0.68 0.66 0.28 † † †
S16 1 K071801 1.22 1.01 0.46 † † †
2 K071901 1.20 1.62 0.27 † † †
3 K072001 0.34 0.55 0.26 † † †
4 K072101 1.07 0.00 0.20 † † †
5 K072201 0.53 0.57 † -0.47 0.47 †
10 K072601 0.60 -0.48 † 1.95 -1.95 †
11 K072701 0.98 0.76 0.24 † † †
12 K072801 1.38 0.55 0.16 † † †
13 K072901 1.74 1.43 0.24 † † †
S17 1 K073001 0.70 -0.11 0.23 † † †
3 K073201 0.67 0.02 0.21 † † †
4 K073301 0.84 -0.39 0.27 † † †
8 K073401 0.84 0.08 0.34 † † †
9 K073501 0.71 1.53 † 0.37 0.36 -0.73
11 K073701 0.58 0.23 0.24 † † †
12 K073801 0.57 1.44 † 0.42 -0.42 †
14 K073901 0.86 0.89 0.30 † † †
15 K074001 1.42 1.15 0.34 † † †
S18 2 K074201 1.24 1.54 0.17 † † †
4 K074301 0.63 1.30 † -0.67 0.67 †
6 K074401 1.04 0.33 0.25 † † †
7 K074501 0.52 0.37 † -0.75 0.75 †
8 K074601 0.80 0.47 † 0.42 -0.42 †
10 K074701 0.38 3.04 0.20 † † †
12 K074801 0.49 0.74 † -0.32 0.61 -0.29
13 K074901 1.15 0.93 0.21 † † †
Last updated 27 July 2009 (JL)

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