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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 Spatial Dynamics and Connections Scale, Grade 4 Geography National Assessment, by Item and Block: 2010
NAEP Technical DocumentationIRT parameters for the spatial dynamics and connections scale, grade 4 geography national assessment, by 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 3 G028001 1.25 0.49 0.12 † † † † †
4 G028101 0.94 -0.47 0.30 † † † † †
5 G028201 0.39 0.38 † 0.29 0.42 -0.71 † †
6 G028301 0.93 0.26 0.17 † † † † †
8 G028501 0.53 0.68 † † † † † †
9 G028601 1.17 1.31 0.35 † † † † †
12 G028901 0.84 0.46 0.20 † † † † †
13 G029001 1.20 0.99 0.21 † † † † †
G4 9 G008503 0.78 0.21 † 0.62 -0.62 † † †
G5 5 G009301 0.92 0.46 0.26 † † † † †
7 G009402 0.43 1.64 † † † † † †
8 G009403 0.76 -1.65 † † † † † †
9 G009501 0.49 -0.06 0.26 † † † † †
10 G009502 1.65 0.60 0.25 † † † † †
15 G010001 1.61 0.43 0.23 † † † † †
G6 3 G029901 0.51 0.06 0.33 † † † † †
4 G030001 0.88 1.13 0.25 † † † † †
6 G030201 1.39 0.75 0.20 † † † † †
7 G030301 0.75 0.91 0.23 † † † † †
8 G030401 0.68 0.35 0.25 † † † † †
13 G031201 0.92 0.16 0.20 † † † † †
15 G031401 0.51 0.53 † 0.91 -0.19 -0.72 † †
G7 5 G044801 0.90 0.69 0.29 † † † † †
6 G045202 0.56 2.25 0.27 † † † † †
13 G043801 1.54 0.94 0.20 † † † † †
G8 4 G059501 0.39 -0.70 0.26 † † † † †
6 G042702 0.65 0.47 † † † † † †
8 G043301 0.68 1.64 0.17 † † † † †
10 G041401 0.28 2.76 0.27 † † † † †
11 G043401 0.53 1.07 † 1.48 -1.48 † † †
15 G041801 0.87 1.82 0.19 † † † † †
Last updated 30 June 2014 (GF)
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