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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Civics Assessment IRT Parameters → IRT Parameters for the Single Overall Scale, Grade 4 Civics National Assessment, by Item and Block: 2010
NAEP Technical DocumentationIRT parameters for the single overall scale, grade 4 civics 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 Civics Assessment.
C3 1 P042301 1.17 0.72 0.23
2 P043901 0.79 1.09 0.38
3 P047401 0.56 0.78 1.20 -1.20
4 P045101 0.99 -1.01 0.30
6 P042801 1.22 -0.47 0.27
7 P044101 0.82 0.24 0.23
8 P042901 0.48 0.95 0.71 -0.71
9 P046201 1.30 1.59 0.16
10 P043301 0.52 0.59 1.61 -1.61
11 P046801 1.12 -0.52 0.38
12 P046601 1.79 0.04 0.24
13 P048001 0.50 1.08 1.06 0.54 -1.60
14 P046501 0.85 -0.94 0.34
15 P047701 0.93 -0.22 0.31
16 P047201 1.01 0.23 0.27
C4 1 P040101 0.99 -0.48 0.23
2 P040102 0.44 -0.45
3 P040103 0.55 -0.16 0.25
4 P040104 1.29 1.05 0.20
5 P040105 0.45 0.68 0.46 -0.46
6 P040106 0.84 0.32 0.24
7 P040107 1.11 0.86 0.32
8 P040108 0.73 -0.17 0.25
9 P040109 0.56 1.76 -0.47 0.47
10 P040110 0.66 2.60 0.24
11 P040111 0.50 0.23 0.04 -0.04
12 P040112 1.17 1.52 0.14
13 P040113 1.03 0.57 0.21
14 P040114 1.03 -0.31 0.22
15 P040115 1.43 0.89 0.31
C5 1 P040201 1.55 0.59 0.14
2 P040202 0.54 -0.31 0.23
3 P040203 0.60 1.42 -0.70 1.21 -0.51
4 P040204 1.02 -0.72 0.27
5 P040205 1.56 0.06 0.26
6 P040206 0.46 -0.32 3.13 -3.13
7 P040207 0.87 0.68 0.18
8 P040208 0.73 1.78 0.21
9 P040209 0.37 1.35 -0.39 0.39
10 P062701 0.51 -2.74 0.27
11 P062702 0.99 0.68 0.22
12 P040212 0.58 2.65 0.20
13 P040213 1.49 0.41 0.22
14 P040214 1.12 0.60 0.23
15 P040215 1.13 0.26 0.25
C6 1 P042120 0.63 -1.03 0.32
2 P042121 1.25 -0.28 0.25
3 P042122 0.70 -0.28 0.77 -0.77
5 P042124 1.30 1.18 0.27
6 P042125 0.43 -2.18 0.19 -0.19
7 P042126 0.74 -0.89 0.25
8 P042127 1.38 1.04 0.26
9 P042128 0.74 0.00 0.23
10 P042129 0.33 0.08
11 P042130 0.58 0.24 0.28
12 P042131 0.65 0.31 0.24
13 P042132 0.57 1.29 1.16 -1.16
14 P042133 0.93 1.09 0.25
15 P042134 0.60 0.41 0.21
C7 1 P042135 0.83 -1.11 0.28
2 P042136 0.68 0.25 0.28 -0.28
3 P042137 0.89 -0.41 0.30
4 P042138 0.85 1.16 0.38
5 P042139 0.88 1.30 0.25
6 P042140 0.45 0.32 0.04 1.02 -1.06
7 P042141 1.23 1.07 0.16
8 P042142 0.84 0.16 0.21
9 P042143 0.60 0.40 0.92 0.24 -1.16
10 P042144 0.60 0.70 0.31
11 P042145 1.16 -0.59 0.31
12 P042146 0.98 1.37 0.12
13 P042147 0.29 1.14 -3.00 3.00
14 P042148 0.96 -0.04 0.22
15 P042149 1.08 -0.63 0.20
C8 1 P046101 1.49 0.25 0.27
2 P045601 0.59 -2.25 0.30
3 P045501 0.46 -0.72 1.08 -1.08
4 P045701 0.51 1.63 0.26
5 P043001 0.44 0.14 0.24
6 P044401 0.96 0.66 0.25
7 P044801 0.45 1.20 0.41 0.17 -0.58
8 P044601 0.64 -0.02 0.25
9 P047101 0.86 -0.61 0.27
10 P047301 0.47 0.82 0.26
11 P044301 0.60 -1.61 0.76 -0.76
12 P044201 0.57 -0.17 0.25
13 P047501 1.63 1.43 0.30
14 P043501 1.17 1.39 0.31
15 P048101 1.11 -0.29 0.27

Last updated 03 June 2016 (GF)