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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 Space and Place Scale, Grade 12 Geography National Assessment, by Item and Block: 2010
NAEP Technical DocumentationIRT parameters for the space and place scale, grade 12 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 2 G020601 0.74 0.09 0.23
3 G020602 0.36 2.67 0.22
5 G020801 0.78 -0.45 0.20
9 G021101 0.36 -1.34 0.23
12 G021401 0.70 -0.23 -0.21 0.40 -0.19
14 G021601 0.75 1.91 -0.29 0.57 -0.29
G4 5 G038301 0.81 0.27 0.18
6 G038401 0.53 0.95 0.75 -0.75
9 G038701 0.82 -0.01 0.23
12 G039001 0.59 -0.34 0.26
16 G039401 0.89 0.33 0.18
G5 1 G056301 0.69 0.06 0.24
3 G048901 1.17 0.48 0.33
4 G056201 0.97 0.58 0.20
8 G059601 0.81 0.84 0.24
16 G055701 1.08 1.14 0.27
17 G054501 1.68 1.50 0.15
G6 1 G034501 0.49 -1.06 0.24
11 G035501 0.58 1.15 0.17 0.12 -0.28
G7 1 G058701 0.51 0.29 0.19
2 G057001 0.96 -0.30 0.26
3 G059001 0.39 0.92 -3.59 3.59
4 G057501 0.67 -1.26 0.26
7 G058801 0.45 3.14 2.28 -2.28
8 G058901 1.48 0.06 0.22
9 G059101 1.20 -0.49 0.24
10 G057601 0.49 1.50 0.93 -0.93
11 G057301 0.85 1.68 0.26
13 G056501 0.64 2.02 0.33 -0.33
14 G056901 0.84 0.32 0.26
15 G056401 0.80 0.27 0.26
G8 1 G024701 1.77 1.08 0.26
3 G024901 2.10 1.84 0.13
4 G024902 1.04 1.41 0.34
5 G024903 0.75 -0.14 0.34
11 G025401 1.43 0.56 0.18
G9 1 G025901 1.06 1.07 0.23
2 G026001 1.17 0.85 0.22
3 G026002 0.56 0.83 0.24
5 G026201 1.39 0.10 0.36
6 G026202 0.69 0.23 0.21
7 G026203 0.99 -0.57 0.23
8 G026204 0.92 0.12
12 G026501 1.64 -0.96 0.32
13 G026502 0.86 -0.12
15 G026601 0.89 1.59 0.21 -0.21
16 G026701 0.76 -0.39 0.43
17 G026702 1.11 0.53 0.24
18 G026801 1.10 -1.10 0.25
19 G026802 1.05 1.09 0.17
20 G026803 0.38 0.98 0.27
21 G026901 0.79 1.29
22 G027001 0.53 -1.85 0.22

Last updated 30 June 2014 (GF)