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NAEP Analysis and Scaling → Estimation of NAEP Scale Scores → NAEP Assessment IRT Parameters → Geography Assessment IRT Parameters → IRT Parameters for the Spatial Dynamics and Connections Scale, by Block and Item, Grade 4 Geography National Main Assessment (Accommodations Not Permitted [R2]): 2001

NAEP Technical DocumentationIRT parameters for the spatial dynamics and connections scale, by block and item, grade 4 geography national main assessment (accommodations not permitted [R2]): 2001
Block Item NAEP ID aj bj cj dj1 dj2 dj3
† 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), 2001 Geography Assessment.
G3 3 G028001 1.34 0.56 0.16 † † †
G3 4 G028101 1.21 -0.42 0.28 † † †
G3 5 G028201 0.40 0.41 † 0.00 0.51 -0.51
G3 6 G028301 1.06 0.26 0.19 † † †
G3 8 G028501 0.68 0.60 0.00 † † †
G3 9 G028601 1.01 1.27 0.36 † † †
G3 12 G028901 1.24 0.37 0.21 † † †
G3 13 G029001 1.40 0.86 0.22 † † †
G4 9 G008503 0.84 0.17 † 0.46 -0.46 †
G5 5 G009301 1.26 0.41 0.27 † † †
G5 7 G009402 0.55 1.03 0.00 † † †
G5 8 G009403 0.83 -1.33 0.00 † † †
G5 9 G009501 0.86 0.50 0.40 † † †
G5 10 G009502 1.91 0.72 0.28 † † †
G5 14 G010001 1.76 0.49 0.28 † † †
G6 3 G029901 0.54 0.04 0.29 † † †
G6 4 G030001 0.87 0.89 0.24 † † †
G6 6 G030201 1.41 0.72 0.23 † † †
G6 7 G030301 0.93 0.98 0.28 † † †
G6 8 G030401 0.74 0.35 0.24 † † †
G6 13 G031201 1.12 0.31 0.21 † † †
G6 15 G031401 0.59 0.46 † 0.81 -0.23 -0.59
G8 7 G012501 1.35 2.60 0.22 † † †
G8 8 G012502 1.27 1.32 0.23 † † †
G8 9 G012503 1.07 -0.08 0.00 † † †
G8 11 G012701 1.00 2.04 0.33 † † †
G8 13 G012901 1.32 1.02 0.22 † † †
G8 14 G012902 0.59 0.59 0.00 † † †
Last updated 08 March 2010 (GF)

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