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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 National Economy Scale, Grade 12 Economics National Assessment, by Item and Block: 2012

NAEP Technical DocumentationIRT parameters for the national 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 1 E418701 0.32 -2.60 0.26
5 E427501 0.66 0.12 -0.81 0.81
6 E426101 0.84 1.89 0.12
9 E429201 1.03 0.75 0.18
14 E420901 1.93 1.30 0.20
17 E422501 1.10 1.07 0.13
18 E429401 1.01 1.25 0.28
19 E428601 0.70 0.12 0.24
E2 2 E427301 0.92 0.74 0.22
3 E423101 0.76 0.39 0.26
4 E421701 0.62 0.21 0.11 -0.11
5 E423701 1.34 0.67 0.20
7 E425201 1.73 0.39 0.16
12 E423201 2.08 0.87 0.18
17 E426601 1.20 -0.09 0.21
18 E429801 1.15 -0.94 0.26
E3 2 E403601 1.26 -0.78 0.22
4 E403801 1.02 0.38 0.24
7 E404101 0.33 -0.90 0.21
9 E404301 0.50 -1.62 0.20
12 E404601 0.41 1.66 1.15 -1.15
13 E404701 0.63 2.22 0.31
15 E404901 0.70 0.77 0.14
16 E405001 1.46 0.22 0.30
19 E405301 0.37 0.46 0.23
E4 6 E421601 0.61 -0.17 0.26
8 E430101 0.91 -0.78 0.21
12 E428501 1.13 0.46 0.23
14 E430201 1.58 0.26 0.22
16 E420201 1.54 1.19 0.30
17 E423801 1.23 -0.73 0.30
E5 1 E407201 0.83 -0.09 0.37
2 E407301 0.75 -0.52 0.19
4 E407501 0.72 1.54 1.44 0.86 -2.30
8 E407901 0.54 1.07 0.20
11 E408201 0.80 0.01 0.17
14 E408501 2.17 1.97 0.21
15 E408601 0.90 0.00 0.29
19 E409001 0.98 0.84 0.37
E6 3 E409501 0.69 -1.03 0.21
9 E410101 0.96 0.28 0.25
10 E410201 0.42 1.94 1.33 0.62 -0.61 -1.34
18 E411001 0.89 1.04 0.32
E7 3 E411301 1.54 1.39 0.27
4 E411401 0.52 -1.20 0.44 -0.44
6 E411601 0.86 0.65 0.27
7 E411701 1.05 -0.02 0.19
8 E411801 0.37 -0.71 0.23
10 E412001 1.03 0.83 0.16
11 E412101 0.31 -1.05 0.22
13 E412301 0.31 1.89 0.81 -0.81
E8 4 E413201 0.51 -0.06 -2.74 2.63 0.11
5 E413301 0.48 0.59 0.28
6 E413401 0.90 1.43 0.21
7 E413501 1.26 0.34 0.27
8 E413601 1.19 1.28 0.21
9 E413701 1.35 1.96 0.71 -0.71
18 E414601 1.36 0.80 0.17
19 E414701 1.97 1.47 0.14
E9 3 E415101 1.81 1.39 0.23
6 E415401 1.81 2.07 0.34
8 E415601 0.87 1.04 0.20
9 E415701 1.41 0.62
12 E416001 1.80 0.22 0.25
16 E416401 0.76 0.46 0.30
E10 2 E417001 1.09 0.90 0.27
3 E417101 0.54 0.85 0.33
5 E417301 1.63 1.36 0.32
6 E417401 0.25 1.32 0.25
13 E418101 0.52 0.46 0.43 -0.43
14 E418201 1.86 1.61 0.16
15 E418301 0.72 2.30 0.36

Last updated 30 June 2014 (GF)