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NAEP Analysis and Scaling → Estimation of NAEP Scale Scores → NAEP Assessment IRT Parameters → Civics Assessment IRT Parameters → IRT Parameters for the Civics Scale, Grade 8 Civics National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the civics scale, grade 8 civics national main assessment, by item and block: 2006
Block Item NAEP ID aj bj cj dj1 dj2 dj3
† 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: 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 describes 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), 2006 Civics Assessment.
P3 1 P042169 0.80 -1.04 0.25
2 P042170 0.53 -0.47 0.23
3 P042171 0.58 -0.54 0.77 -0.77
4 P042172 0.49 1.46 0.21
5 P042173 0.76 1.01 0.34
6 P042174 0.93 1.80 0.60 -0.60
7 P042175 0.44 -1.44 0.26
8 P042176 0.52 0.89 0.33
9 P042177 0.42 -0.62 0.06 -0.06
10 P042178 1.68 0.91 0.29
11 P042179 1.90 1.03 0.23
12 P042180 0.64 0.75 0.27
13 P042181 0.51 0.95 0.85 -0.85
14 P042182 0.60 -2.33 0.28
15 P042183 1.51 0.81 0.36
16 P042184 0.54 0.46
17 P042185 0.82 1.06 0.30
18 P042186 1.35 -1.07 0.27
19 P042187 0.97 0.78 0.17
20 P042188 1.21 0.36 0.40
P4 1 P040801 1.47 0.10 0.27
2 P040802 1.89 0.28 0.23
3 P040803 0.61 0.39 0.48 -0.48
4 P040804 0.57 -1.59 0.30
5 P040805 1.36 1.03 0.21
6 P040806 1.64 1.07 0.11
7 P040807 0.42 0.90 1.33 -0.55 -0.78
8 P040808 0.65 2.97 0.16
9 P040809 1.41 1.01 0.23
10 P040810 1.16 0.26 0.24
11 P040811 1.38 0.85 0.23
12 P040812 0.97 1.15 0.30
13 P040813 0.70 1.47 0.55 0.00 -0.54
14 P040814 1.51 1.17 0.10
15 P040815 1.49 0.96 0.16
16 P040816 0.81 0.87 0.16
17 P040817 1.16 -0.20 0.30
18 P040818 1.60 0.45 0.27
19 P040819 1.70 0.89 0.23
P5 1 P040901 0.68 -1.20 0.32
2 P040902 1.04 1.13 0.13
3 P040903 0.46 0.60 0.46 -0.46
4 P040904 0.80 0.49 0.12
6 P040906 0.72 1.39 -0.38 0.38
7 P040907 0.70 0.93 0.19
8 P040908 0.88 -0.12 0.18
9 P040909 1.48 -0.21 0.25
10 P040910 0.56 1.41 1.19 -1.19
11 P040911 0.29 1.45 0.23
12 P040912 1.85 1.51 0.24
13 P040913 0.88 0.53 0.50 -0.50
14 P040914 0.98 0.52 0.17
15 P040915 1.94 1.44 0.28
16 P040916 1.42 1.15 0.25
17 P040917 0.75 0.90 0.13
18 P040918 0.99 0.04 0.29
19 P040919 1.10 0.45 0.20
P6 1 P041001 0.80 0.23 0.32
2 P041002 0.71 1.15 0.35
3 P041003 0.96 1.09
4 P041004 1.03 -0.65 0.36
5 P041005 0.95 0.06 0.15
6 P041006 1.80 0.96 0.39
7 P041007 0.82 0.91 0.22 -0.22
8 P041008 0.74 -0.14 0.19
9 P041009 0.97 0.24 0.22
10 P041010 0.66 1.27 0.22
11 P041011 1.23 0.21 0.32
12 P041012 1.34 -0.08 0.24
13 P041013 0.30 0.85 2.09 -2.09
14 P041014 0.30 0.90
15 P041015 1.30 0.51 0.19
16 P041016 1.35 0.68 0.22
17 P041017 1.68 0.78 0.32
18 P041018 1.10 -0.09 0.29
19 P041019 0.57 0.84 0.23
P7 1 P041101 0.38 -0.92 0.29
2 P041102 0.61 0.94 0.19 -0.19
3 P041103 1.05 0.48 0.17
4 P041104 1.25 1.31 0.24
5 P041105 1.14 1.21 0.28
6 P041106 0.38 1.67 2.41 -2.41
7 P041107 1.34 0.17 0.41
8 P041108 1.09 -0.08 0.27
9 P041109 2.45 2.02 0.26
10 P041110 1.07 1.28 0.25
11 P041111 0.88 1.02 -0.15 0.15
12 P041112 0.47 -0.81 0.36
13 P041113 0.96 0.71 0.39
14 P041114 1.55 1.99 0.15
15 P041115 1.12 1.38 0.25
16 P041116 0.90 1.12 0.29 -0.29
17 P041117 0.98 -0.88 0.36
18 P041118 1.60 1.28 0.26
19 P041119 0.97 0.21 0.30
P8 1 P041201 0.69 0.09 0.24
2 P041202 0.84 -0.21
3 P041203 0.42 -2.28 0.26
5 P041205 0.24 -2.19 -0.67 0.67
6 P041206 0.95 0.05 0.20
7 P041207 1.00 0.67 0.33
8 P041208 0.79 0.24 0.24
9 P041209 1.24 0.73 0.29
10 P041210 0.50 0.27 0.24
11 P041211 0.98 1.22 0.24
12 P041212 0.85 0.25 0.30
13 P041213 0.57 1.34 0.55 0.48 -1.03
14 P041214 1.82 1.38 0.34
15 P041215 1.08 -0.37 0.23
16 P041216 1.77 0.73 0.20
17 P041217 0.46 1.85 0.23
18 P041218 1.81 0.65 0.34
19 P041219 0.99 -0.55 0.23
P9 1 P041301 0.91 0.57 0.40
2 P041302 1.18 0.47 0.24
3 P041303 1.51 0.21 0.29
4 P041304 1.63 -0.29 0.37
5 P041305 0.95 0.73 0.37
6 P041306 1.14 -0.74 0.26
7 P041307 0.83 0.99 0.88 -0.63 -0.25
8 P041308 1.76 1.56 0.20
9 P041309 0.45 0.99 0.48 -0.48
10 P041310 1.87 0.82 0.31
11 P041311 0.34 1.61 0.32
12 P041312 1.13 1.43 0.18
13 P041313 1.01 -1.07 0.34
14 P041314 1.27 0.89 0.23
15 P041315 0.57 -0.07 0.61 -0.61
16 P041316 1.13 0.73 0.29
17 P041317 1.36 0.85 0.16
18 P041318 0.92 0.59 0.31
19 P041319 0.74 0.64 0.29
P10 1 P042150 0.72 -1.05 0.29
2 P042151 1.26 0.37 0.23
3 P042152 0.72 0.40 0.58 -0.58
4 P042153 1.52 0.80 0.33
5 P042154 1.23 -0.05 0.24
6 P042155 0.63 -0.78 0.13 -0.13
7 P042156 1.82 0.41 0.21
8 P042157 1.35 0.04 0.22
9 P042158 0.45 0.29 1.33 -1.33
10 P042159 1.20 0.68 0.28
11 P042160 1.48 0.99 0.27
12 P042161 1.74 0.11 0.23
13 P042162 1.01 1.00 0.31 -0.31
14 P042163 1.52 0.88 0.23
15 P042164 0.99 1.77 0.20
16 P042165 1.49 0.22 0.16
17 P042166 1.19 0.49 0.39
18 P042167 0.86 -1.28 0.28
19 P042168 1.40 0.40 0.36

Last updated 08 January 2010 (JL)

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