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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Geography Assessment IRT Parameters → IRT Parameters for the Environment and Society Scale, Grade 12 Geography National Assessment, by Item and Block: 2010
NAEP Technical DocumentationIRT parameters for the environment and society scale, grade 12 geography national assessment, item and block: 2010
Block Item NAEP ID aj bj cj dj1 dj2 dj3  dj4  dj5 
† Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models.
NOTE: Single overall scale. 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 represents the category threshold parameter for category i. The c parameter value is exactly zero for items scaled with the two-parameter logistic model. For item j, dji may not sum to zero because of rounding.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010 Geography Assessment.
G3 4 G020701 0.68 0.97 † 0.55 -0.55 † † †
8 G021001 0.52 1.90 † 1.11 -0.01 -1.10 † †
15 G021602 0.52 1.71 † 0.63 -0.63 † † †
16 G021701 0.96 0.40 0.18 † † † † †
17 G021702 0.85 -0.22 0.31 † † † † †
G4 2 G038001 0.65 -1.17 0.33 † † † † †
10 G038801 0.61 1.05 † 1.13 -0.17 -0.95 † †
13 G039101 1.05 1.24 0.24 † † † † †
14 G039201 0.61 0.81 † 1.18 -1.18 † † †
15 G039301 0.62 1.36 0.20 † † † † †
G5 6 G055101 1.32 1.17 0.22 † † † † †
G6 3 G034701 0.78 -0.40 0.23 † † † † †
6 G035001 0.65 0.36 † 1.47 -0.36 -1.11 † †
9 G035301 0.64 -0.33 † 0.72 -0.15 -0.57 † †
13 G035701 0.89 0.63 0.27 † † † † †
14 G035801 0.58 1.23 0.39 † † † † †
15 G035901 0.95 0.94 0.35 † † † † †
G7 5 G056801 0.55 1.32 † 0.59 -0.34 -0.25 † †
16 G057801 0.93 -0.43 0.29 † † † † †
G8 6 G025001 0.75 1.53 † 0.35 -0.35 † † †
7 G025101 0.77 0.29 † 0.11 -0.11 † † †
10 G025301 0.87 2.31 † 0.52 -0.64 0.11 † †
16 G025701 0.89 0.60 0.32 † † † † †
G9 4 G026101 0.83 -0.96 † 0.17 -0.17 † † †
9 G026301 0.62 1.53 † 1.11 -1.84 0.73 † †
14 G026503 0.75 1.45 † 0.67 0.29 -0.96 † †
Last updated 30 June 2014 (GF)
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