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NAEP Analysis and Scaling → Estimation of NAEP Scale Scores → NAEP Assessment IRT Parameters → Economics Assessment IRT Parameters → IRT Parameters for the Market Economy Scale, Grade 12 Economics National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the market economy scale, grade 12 economics national main assessment, by item and block: 2006
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: 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), 2006 Economics Assessment.
EA 3 E000201 0.90 0.33 0.18
9 E000801 0.83 0.89 0.15
10 E000901 0.66 0.39 0.19
12 E001101 0.36 -0.61 0.06 0.63 -0.69
15 E001401 1.09 0.49 0.29
17 E001601 1.04 0.14 0.30
EB 1 E001701 0.93 -0.99 0.26
3 E001901 0.79 -1.06 0.29
4 E002001 0.51 -1.65 0.13 -0.13
5 E002101 1.27 0.08 0.29
6 E002201 1.73 0.26 0.26
10 E002601 1.07 0.83 0.25
11 E002701 0.97 0.29 0.27
12 E002801 1.21 -0.12 0.24
13 E002901 0.53 -0.62 0.38 -0.38
EC 1 E003501 1.01 -0.45 0.28
3 E003701 0.77 0.45 0.24
5 E003901 0.61 -0.12 0.54 -0.54
6 E004001 1.26 1.19 0.22
8 E004201 1.04 0.83 1.00 -1.00
10 E004401 0.85 0.02 0.29
14 E004801 1.12 -0.71 0.32
17 E005101 1.09 0.97
18 E005201 1.10 -0.17 0.37
ED 1 E005401 1.08 0.52 0.24
2 E005501 1.66 0.87 0.18
4 E005701 0.82 0.06 1.64 -1.64
6 E005901 0.50 -1.27 0.27
9 E006201 0.30 -0.12 0.76 -0.64 -0.12
11 E006401 0.61 -0.64 0.19
15 E006801 0.80 1.13 0.38
17 E007001 1.75 1.27 0.27
EE 5 E007601 1.02 0.20 0.28
6 E007701 0.94 0.16 0.43
9 E008001 0.37 0.09 1.01 -1.01
12 E008301 1.38 1.03 0.29
13 E008401 0.67 0.30 0.59 -0.59
16 E008701 1.07 -0.16 0.31
17 E008801 1.94 0.29 0.22
18 E008901 0.82 -0.42 0.23
20 E009101 0.80 0.92 0.29
21 E009201 0.80 0.60 0.29
EF 1 E009301 1.12 -0.80 0.30
2 E009401 1.32 -0.27 0.24
4 E009601 0.72 -0.79 0.27
5 E009701 0.36 1.75 1.68 -1.68
8 E010001 2.43 1.19 0.21
13 E010501 1.23 0.42 0.31
14 E010601 0.45 -0.07 0.66 -0.66
15 E010701 1.10 -0.92 0.24
16 E010801 0.77 1.06 0.33
17 E010901 0.94 0.31 0.24
EG 2 E011201 1.07 -0.06 0.25
5 E011501 0.53 -0.20 0.25
9 E011901 0.60 1.34 2.90 0.52 -3.42
14 E012401 1.34 1.12 0.24
16 E012601 1.45 -0.06 0.34
17 E012701 1.59 -0.15 0.21
18 E012801 1.45 -0.56 0.20
EH 2 E013001 0.62 -0.14 0.24
3 E013101 1.33 0.97 0.14
11 E013901 1.35 -0.39 0.27
12 E014001 1.07 -0.33 0.27
13 E014101 0.62 -1.41
14 E014201 1.01 0.13 0.20
15 E014301 1.36 0.19 0.15
16 E014401 1.84 0.77 0.26
17 E014501 1.12 0.96 0.18
20 E014801 0.98 0.83 0.29
EI 1 E014901 0.84 -0.38 0.35
5 E015301 1.10 -0.71 0.22
7 E015501 1.73 0.33 0.28
10 E015801 1.02 0.40 0.20
11 E015901 1.23 1.06 0.23
13 E016101 0.64 -0.73 0.35 -0.35
14 E016201 0.99 0.69 0.14
15 E016301 1.80 1.12 0.34
18 E016601 1.07 -0.42 0.24
20 E016801 0.60 -1.77 0.25
EJ 1 E016901 1.03 -0.76 0.32
4 E017201 0.62 0.62 1.64 -1.64
7 E017501 0.80 0.41 0.18
8 E017601 1.41 0.30 0.18
10 E017801 1.16 1.66 0.23
11 E017901 0.65 -1.75 0.27
12 E018001 0.92 0.84 0.30
17 E018501 1.63 -0.03 0.31

Last updated 08 January 2010 (JL)

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