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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 12 Geography National Main Assessment (Accommodations Not Permitted [R2]): 2001

NAEP Technical DocumentationIRT parameters for the space and place 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 2 G020601 0.74 -0.09 0.31 † † †
G3 3 G020602 0.52 2.15 0.27 † † †
G3 5 G020801 0.89 -0.23 0.25 † † †
G3 9 G021101 0.35 -1.07 0.27 † † †
G3 12 G021401 0.75 -0.32 † -0.29 0.39 -0.10
G3 14 G021601 0.86 1.71 † -0.15 0.43 -0.28
G4 5 G038301 1.03 0.45 0.22 † † †
G4 6 G038401 0.57 0.86 † 0.79 -0.79 †
G4 9 G038701 0.88 0.14 0.27 † † †
G4 12 G039001 0.62 -0.45 0.25 † † †
G4 16 G039401 1.17 0.41 0.22 † † †
G5 1 G016201 0.58 -1.14 † -1.11 1.11 †
G5 2 G016202 0.94 -1.27 0.27 † † †
G5 3 G016203 0.65 -1.68 0.26 † † †
G5 4 G016204 1.21 -1.12 0.26 † † †
G5 5 G016301 1.38 -0.56 0.28 † † †
G5 8 G016501 0.53 -1.08 0.24 † † †
G5 13 G016901 0.84 0.47 0.34 † † †
G6 1 G034501 0.49 -1.07 0.27 † † †
G6 11 G035501 0.64 0.94 † 0.28 0.07 -0.35
G7 1 G039601 0.73 0.19 0.24 † † †
G7 2 G039701 1.20 0.70 0.20 † † †
G7 5 G040001 0.57 1.06 † 0.09 0.17 -0.27
G7 9 G040401 0.93 0.55 0.25 † † †
G7 11 G040601 0.73 -0.11 0.25 † † †
G7 12 G040701 0.80 1.55 † 0.57 -0.57 †
G7 15 G041001 1.10 0.67 0.21 † † †
G8 1 G024701 1.75 0.91 0.26 † † †
G8 3 G024901 1.90 1.70 0.13 † † †
G8 4 G024902 1.09 1.26 0.32 † † †
G8 5 G024903 0.99 0.08 0.42 † † †
G8 11 G025401 1.71 0.40 0.17 † † †
G9 1 G025901 1.09 0.84 0.22 † † †
G9 2 G026001 1.47 0.93 0.20 † † †
G9 3 G026002 0.70 1.12 0.31 † † †
G9 5 G026201 1.41 0.10 0.37 † † †
G9 6 G026202 0.74 0.08 0.20 † † †
G9 7 G026203 1.10 -0.51 0.27 † † †
G9 8 G026204 0.64 0.33 † -0.44 0.44 †
G9 10 G026401 1.66 1.84 0.13 † † †
G9 11 G026402 1.13 1.12 0.22 † † †
G9 12 G026501 1.78 -0.92 0.30 † † †
G9 13 G026502 0.94 -0.11 0.00 † † †
G9 15 G026601 0.85 1.37 † 0.22 -0.22 †
G9 16 G026701 0.76 -0.90 0.28 † † †
G9 17 G026702 1.02 0.39 0.20 † † †
G9 18 G026801 1.04 -1.08 0.23 † † †
G9 19 G026802 1.28 0.82 0.16 † † †
G9 20 G026803 0.64 1.07 0.33 † † †
G9 21 G026901 0.83 1.25 0.00 † † †
G9 22 G027001 0.56 -1.70 0.24 † † †
Last updated 08 March 2010 (GF)

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