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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 8 Geography National Assessment, by Item and Block: 2010
NAEP Technical DocumentationIRT parameters for the space and place scale, grade 8 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 1 G013301 0.71 -1.72 0.24
2 G013302 0.46 -1.19 0.28
3 G013401 0.75 -1.25 0.20
7 G013601 0.78 -1.52 0.20
8 G013602 0.58 -0.49 0.18
9 G013701 0.82 -0.28 0.22
13 G014101 1.44 1.26 0.16
16 G014401 0.70 1.59 1.72 -1.72
17 G014501 1.31 1.99 0.25
G4 4 G033201 1.15 0.71 0.32
11 G033901 1.31 0.99 0.25
15 G034301 0.89 0.92 0.27
16 G034401 0.99 0.53 0.43
G5 2 G050001 0.39 0.98 0.51 -0.51
3 G046701 0.69 -0.15 0.95 -0.95
5 G051301 0.79 1.46 0.21
6 G048701 0.88 0.43 0.23
12 G048601 0.67 1.28 0.21
15 G047001 1.48 0.83 0.28
17 G049801 0.98 -0.81 0.22
G6 1 G034501 0.62 -0.53 0.21
11 G035501 0.52 1.78 0.14 0.10 -0.25
G7 1 G051801 1.02 -0.38 0.21
2 G051601 0.30 -1.16 -3.02 0.06 2.96
3 G051501 0.70 -0.50 0.18
4 G052101 0.68 0.70 0.22
5 G052901 0.62 -0.57 0.42 -0.42
6 G052601 0.86 -0.54 0.24
7 G053201 1.06 0.33 0.10
8 G052501 0.86 1.39 -0.53 0.53
12 G052701 1.13 1.22 0.23
15 G053801 1.04 0.45 0.26
G8 1 G046101 0.76 1.23 0.24
2 G046201 0.29 -1.26 0.25
3 G049001 0.35 -1.98 -0.06 0.06
8 G049201 0.79 0.32 0.30
9 G048901 0.65 0.39 0.20
13 G050101 1.14 -0.05 0.20
14 G050102 0.77 3.47 0.16
17 G048201 1.15 0.87 0.23
G9 1 G018901 0.90 -0.53 0.11
2 G019001 0.68 -2.65 0.24
3 G019002 0.27 0.28 -7.10 7.10
9 G019301 0.94 0.01 0.13
10 G019302 0.43 1.10
11 G019401 1.64 0.73 0.09
12 G019402 0.62 0.22 0.12 -0.12
13 G019403 0.33 0.78 0.24
14 G019501 0.39 -0.77 0.21
15 G019601 0.68 -0.10 0.21
16 G019701 0.57 1.21 0.26
17 G019702 0.85 0.32 0.40
18 G019703 0.76 0.67 0.30
19 G019801 0.67 -0.42 0.20
22 G020101 0.94 0.48 0.24
26 G020401 0.34 -0.96 0.24

Last updated 30 June 2014 (GF)