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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 12 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 12 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 1 G020501 1.07 -0.88 0.38 † † †
G3 6 G020802 1.20 -1.42 0.27 † † †
G3 7 G020901 0.60 -1.12 0.26 † † †
G3 11 G021301 1.05 0.49 0.35 † † †
G3 13 G021501 1.01 0.41 0.33 † † †
G4 1 G0375CL 0.48 -0.45 † 1.75 -0.80 -0.95
G4 3 G038101 0.38 2.46 † 2.77 -2.77 †
G4 4 G038201 1.13 0.41 0.28 † † †
G4 7 G038501 0.88 0.66 0.38 † † †
G4 8 G038601 1.48 0.85 0.31 † † †
G4 11 G038901 0.59 0.86 0.36 † † †
G4 17 G039501 1.88 1.37 0.21 † † †
G5 6 G016302 0.88 1.19 † 0.46 -0.46 †
G5 9 G016502 0.60 0.74 † 0.54 -0.54 †
G5 10 G016601 0.81 0.10 0.24 † † †
G5 12 G016801 0.60 0.76 0.36 † † †
G5 16 G017101 0.59 0.41 † 0.81 -0.60 -0.21
G5 18 G017301 0.71 -0.38 0.33 † † †
G6 2 G034601 0.60 0.43 0.27 † † †
G6 4 G034801 0.36 0.22 † 0.41 1.02 -1.43
G6 5 G034901 0.80 0.14 0.33 † † †
G6 7 G035101 1.75 -0.11 0.39 † † †
G6 8 G035201 1.06 -0.21 0.28 † † †
G6 10 G035401 0.70 1.27 0.26 † † †
G6 12 G035601 1.54 0.92 0.34 † † †
G6 16 G036001 1.35 0.58 0.24 † † †
G7 6 G040101 0.67 0.32 0.34 † † †
G7 7 G040201 0.90 1.15 0.23 † † †
G7 8 G040301 0.56 1.38 † 0.64 0.12 -0.77
G7 13 G040801 1.38 0.91 0.22 † † †
G7 14 G040901 1.16 1.41 0.26 † † †
G8 2 G024801 1.17 0.37 0.25 † † †
G8 8 G025201 1.80 0.94 0.34 † † †
G8 9 G025202 0.83 0.63 † 0.83 -0.83 †
G8 13 G025501 1.33 0.28 0.19 † † †
G8 14 G025502 0.82 -0.03 0.30 † † †
G8 15 G025601 0.76 1.68 † -0.06 0.06 †
G8 17 G025801 0.91 2.11 0.00 † † †
Last updated 08 March 2010 (GF)

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