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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → IRT Parameters for the Economics Assessments → IRT Parameters for the Market Economy Scale, Grade 12 Economics National Assessment, by Item and Block: 2012
NAEP Technical DocumentationIRT parameters for the market economy scale, grade 12 economics national assessment, by item and block: 2012
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
† 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 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), 2012 Economics Assessment.
E1 4 E429101 1.03 -1.62 0.31
7 E420501 0.90 -0.34 0.22
8 E419001 0.55 0.80 -0.93 0.93
10 E425701 1.45 0.07 0.24
12 E421001 0.43 -0.85 -1.82 1.82
13 E425001 1.01 0.74 0.32
16 E4263CL 0.49 -1.85 1.36 -1.01 -0.35
E2 1 E429501 0.90 -0.22 0.28
6 E429601 2.19 1.35 0.18
8 E420301 0.47 -0.48 -0.80 0.80
9 E429701 1.22 0.80 0.29
10 E425801 0.60 1.52 0.42
11 E420101 1.17 -0.49 0.30
13 E428701 2.49 1.47 0.26
16 E426801 1.08 -0.28 0.21
19 E420701 0.38 -0.29 0.24
20 E429901 0.72 -0.26 0.26
21 E430001 0.77 -0.11 0.33
E3 1 E403501 1.00 -0.47 0.26
3 E403701 0.65 0.96 0.23
5 E403901 0.66 -0.14 0.56 -0.56
6 E404001 1.16 1.29 0.24
8 E404201 1.07 0.90 1.05 -1.05
10 E404401 0.77 -0.13 0.25
14 E404801 1.36 -0.49 0.37
17 E405101 1.04 1.04
18 E405201 1.25 -0.02 0.41
E4 1 E424601 0.71 -0.67 0.33
2 E427601 1.01 -1.27 0.25
3 E422701 0.62 0.70 0.47
4 E420601 0.74 0.54 -0.47 0.47
5 E427901 0.48 0.30 0.24
9 E427401 1.00 -0.07 0.23
10 E4245CL 0.60 -0.31 0.46 -0.46
11 E422801 0.95 2.24 0.17
15 E4243CL 0.54 -0.05 1.34 -0.64 -0.70
18 E430301 0.95 -0.32 0.25
E5 5 E407601 0.99 0.35 0.29
6 E407701 1.08 0.15 0.46
9 E408001 0.33 0.04 1.13 -1.13
12 E408301 1.32 1.10 0.27
13 E408401 0.63 0.25 0.64 -0.64
16 E408701 1.13 -0.12 0.32
17 E408801 1.99 0.29 0.21
18 E408901 0.96 -0.30 0.31
20 E409101 0.76 0.93 0.29
21 E409201 0.81 0.47 0.30
E6 1 E409301 1.16 -0.87 0.31
2 E409401 1.04 -0.19 0.15
4 E409601 0.58 -1.04 0.26
5 E409701 0.32 1.79 1.30 -1.30
8 E410001 1.80 1.30 0.20
13 E410501 1.16 0.35 0.31
14 E410601 0.44 -0.03 0.73 -0.73
15 E410701 1.09 -0.95 0.21
16 E410801 0.95 1.13 0.38
17 E410901 1.00 0.27 0.28
E7 2 E411201 0.98 -0.25 0.23
5 E411501 0.54 -0.25 0.23
9 E411901 0.57 1.48 3.09 0.55 -3.64
14 E412401 1.25 1.14 0.24
16 E412601 1.25 -0.25 0.26
17 E412701 1.59 -0.20 0.20
18 E412801 1.63 -0.54 0.24
E8 2 E413001 0.55 -0.27 0.24
3 E413101 1.23 1.02 0.16
11 E413901 1.25 -0.47 0.24
12 E414001 0.99 -0.35 0.28
13 E414101 0.58 -1.57
14 E414201 0.95 0.04 0.19
15 E414301 1.20 0.12 0.14
16 E414401 1.48 0.82 0.25
17 E414501 1.20 0.89 0.18
20 E414801 1.01 0.89 0.29
E9 1 E414901 0.74 -0.60 0.33
5 E415301 1.11 -0.67 0.24
7 E415501 1.59 0.29 0.28
10 E415801 0.79 0.43 0.20
11 E415901 1.28 1.03 0.26
13 E416101 0.61 -0.70 0.35 -0.35
14 E416201 0.77 0.63 0.13
15 E416301 1.84 1.14 0.33
18 E416601 1.01 -0.46 0.23
20 E416801 0.61 -1.72 0.27
E10 1 E416901 0.96 -0.91 0.34
4 E417201 0.63 0.59 1.76 -1.76
7 E417501 0.74 0.39 0.16
8 E417601 1.43 0.29 0.19
10 E417801 1.12 1.64 0.22
11 E417901 0.68 -1.72 0.29
12 E418001 0.83 0.92 0.30
17 E418501 1.45 -0.17 0.28

Last updated 19 September 2013 (JL)