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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 Space and Place Scale, by Block and Item, Grade 8 Geography National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the space and place scale, by block and item, grade 8 geography national main assessment (accommodations permitted [R3]): 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 G013301 0.69 -1.72 0.25 † † †
G3 2 G013302 0.45 -1.02 0.28 † † †
G3 3 G013401 0.79 -1.05 0.23 † † †
G3 7 G013601 0.84 -1.27 0.22 † † †
G3 8 G013602 0.61 -0.46 0.20 † † †
G3 9 G013701 0.87 -0.11 0.22 † † †
G3 13 G014101 1.50 1.23 0.15 † † †
G3 16 G014401 0.78 1.30 † 1.56 -1.56 †
G3 17 G014501 0.78 1.92 0.26 † † †
G4 4 G033201 1.25 0.77 0.33 † † †
G4 11 G033901 0.97 0.65 0.29 † † †
G4 15 G034301 1.02 1.01 0.27 † † †
G4 16 G034401 0.69 0.04 0.33 † † †
G5 1 G016201 1.00 -0.57 † † † †
G5 2 G016202 1.16 -0.22 0.27 † † †
G5 3 G016203 0.61 -1.26 0.23 † † †
G5 4 G016204 1.17 -0.04 0.28 † † †
G5 5 G016301 1.25 0.25 0.19 † † †
G5 8 G016501 0.75 -0.34 0.19 † † †
G5 13 G016901 0.87 1.14 0.34 † † †
G6 1 G034501 0.70 -0.45 0.23 † † †
G6 11 G035501 0.58 1.63 † 0.32 0.10 -0.43
G7 1 G036101 1.23 0.44 0.45 † † †
G7 3 G036301 0.98 1.61 0.16 † † †
G7 5 G036501 0.70 1.26 † 0.28 0.09 -0.37
G7 6 G036601 0.66 -0.21 0.22 † † †
G7 9 G036901 0.81 0.09 0.22 † † †
G7 11 G037101 0.74 1.14 † 0.28 -0.28 †
G7 12 G037201 1.95 0.57 0.28 † † †
G7 14 G037401 1.03 1.03 0.17 † † †
G8 1 G012201 0.38 -2.19 † -2.65 2.65 †
G8 2 G012202 1.36 -0.33 0.34 † † †
G8 3 G012203 0.71 -1.37 0.26 † † †
G8 4 G012301 0.81 -1.35 0.30 † † †
G8 6 G012401 0.55 -0.34 0.28 † † †
G8 10 G012601 1.10 -0.41 0.24 † † †
G8 15 G013001 0.54 -0.23 † -1.09 0.76 0.33
G8 16 G013101 0.71 0.36 0.21 † † †
G9 1 G018901 1.00 -0.35 0.13 † † †
G9 2 G019001 0.65 -2.56 0.25 † † †
G9 3 G019002 0.27 0.90 † -7.26 7.26 †
G9 9 G019301 1.00 -0.06 0.14 † † †
G9 10 G019302 0.47 0.96 † † † †
G9 11 G019401 1.75 0.77 0.10 † † †
G9 12 G019402 0.61 0.24 † 0.08 -0.08 †
G9 13 G019403 0.38 0.82 0.25 † † †
G9 14 G019501 0.44 -0.67 0.24 † † †
G9 15 G019601 0.75 0.11 0.23 † † †
G9 16 G019701 0.61 1.24 0.28 † † †
G9 17 G019702 0.68 0.17 0.35 † † †
G9 18 G019703 0.72 0.52 0.29 † † †
G9 19 G019801 0.73 -0.46 0.20 † † †
G9 22 G020101 0.92 0.43 0.22 † † †
G9 26 G020401 0.32 -0.14 0.23 † † †
Last updated 08 March 2010 (GF)

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