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HomeTDWNAEP Analysis and ScalingEstimation of NAEP Scale ScoresNAEP Assessment IRT ParametersGeography Assessment IRT ParametersIRT Parameters for the Space and Place Scale, by Block and Item, Grade 4 Geography National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the space and place scale, by block and item, grade 4 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 G0272CL 0.63 -0.10 † 0.16 0.31 -0.47
G3 2 G027901 0.58 -1.32 0.29 † † †
G3 11 G028801 1.17 0.87 0.33 † † †
G3 15 G029201 0.79 -0.61 0.39 † † †
G4 1 G008001 0.81 -0.43 † † † †
G4 2 G008002 1.05 0.99 0.19 † † †
G4 4 G008201 0.62 -0.08 † † † †
G4 5 G008301 1.20 1.10 0.46 † † †
G4 6 G008401 0.65 0.81 0.30 † † †
G4 7 G008501 1.52 0.76 0.16 † † †
G4 8 G008502 1.40 0.88 0.24 † † †
G4 10 G008601 0.57 -1.13 0.27 † † †
G4 11 G008701 0.73 -0.68 † † † †
G4 14 G008902 0.67 -0.95 0.27 † † †
G5 1 G009101 0.95 -0.19 0.34 † † †
G5 2 G009102 1.25 0.43 0.18 † † †
G5 3 G009103 1.04 0.02 0.28 † † †
G5 6 G009401 1.34 0.81 0.16 † † †
G5 11 G009601 0.53 -0.34 † 0.15 0.14 -0.28
G6 1 G0293CL 0.67 1.36 † 2.49 0.58 -3.06
G6 10 G030601 2.00 0.73 0.41 † † †
G6 11 G030701 1.74 1.39 0.43 † † †
G6 12 G0308CL 0.45 1.25 † -3.30 3.30 †
G6 14 G031301 0.98 0.26 0.32 † † †
G7 1 G031501 1.23 1.42 0.23 † † †
G7 2 G031601 0.65 -1.72 0.31 † † †
G7 3 G031701 1.78 0.94 0.34 † † †
G7 4 G031801 1.52 0.33 † † † †
G7 5 G031901 0.83 0.66 † 0.23 -0.23 †
G7 6 G032001 1.32 0.01 0.28 † † †
G7 7 G032101 1.17 0.85 0.29 † † †
G7 8 G032201 1.26 0.84 0.25 † † †
G7 9 G032301 1.10 -0.32 0.28 † † †
G7 11 G032501 1.86 0.20 0.25 † † †
G7 12 G032601 1.24 0.98 † † † †
G7 13 G032701 1.93 0.63 0.22 † † †
G7 14 G032801 2.15 0.86 0.24 † † †
G8 1 G012201 0.74 -0.86 † † † †
G8 2 G012202 0.90 0.43 0.25 † † †
G8 3 G012203 0.70 0.24 0.39 † † †
G8 4 G012301 1.29 0.41 0.36 † † †
G8 6 G012401 0.48 0.53 0.32 † † †
G8 10 G012601 1.65 0.86 0.22 † † †
G8 15 G013001 0.61 1.04 † -0.80 1.01 -0.22
G8 16 G013101 0.89 1.49 0.22 † † †
Last updated 08 March 2010 (GF)

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