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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → IRT Parameters for the Reading Assessments → IRT Parameters for Items in the Reading to Gain Information Scale, Grade 12 Reading National Main Assessment, by Item and Block: 2009

NAEP Technical DocumentationIRT parameters for items in the reading to gain information scale, grade 12 reading national main assessment, by item and block: 2009
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 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), 2009 Reading Assessment.
F6 1 R013201 0.61 0.09 1.11 -0.06 -1.05
2 R013202 0.71 -1.53 0.16
3 R013203 0.97 -2.49
4 R013204 0.84 -1.55 0.19
5 R013205 0.87 -2.19
6 R013206 0.72 -0.77 0.19
7 R013207 0.64 -1.40
8 R013208 1.29 -1.32 0.19
9 R013209 0.62 0.60
10 R013210 0.63 1.15 0.24
11 R013211 0.34 -0.45
12 R013212 0.45 1.00 1.98 -0.64 -1.34
F7 1 R013701 0.43 -0.03
2 R013702 0.51 -0.32
3 R013703 0.78 -1.87 0.23
4 R013704 0.71 1.79
5 R013705 1.16 -1.37 0.23
6 R013706 0.56 -0.42
7 R013707 0.78 -0.19 0.15
8 R013708 0.26 0.68
9 R013709 0.39 0.99 0.17
10 R013710 0.64 1.20
11 R013711 0.48 1.01 0.29
12 R013712 0.60 0.25
F8 1 R053501 0.62 -0.05 1.23 -1.23
2 R053502 0.63 -2.36 0.36
3 R053503 0.71 -0.05 0.11
4 R053504 0.92 -1.29
5 R053505 1.14 -0.46 0.38
6 R053506 0.83 0.24 0.22
7 R053507 0.58 0.01 0.11 0.43 -0.54
8 R053508 1.68 -0.21 0.33
9 R053509 0.82 -0.93
10 R053510 1.37 0.22 0.30
F9 1 R053301 0.87 -3.30
2 R053302 1.11 -0.70 0.19
3 R053303 0.90 -0.67
4 R053304 1.19 -1.73 0.40
5 R053305 0.75 -0.64 -0.12 0.12
6 R053306 1.12 -0.42 0.21
7 R053307 1.55 -1.03 0.26
8 R053308 1.19 -0.70 0.25
9 R053309 0.89 0.36
F10 1 R013401 0.98 -0.30 0.14
2 R013402 0.79 -0.79
3 R013403 0.45 -0.02 -1.95 1.95
4 R013404 0.86 -0.99 0.35
5 R013405 1.06 -0.90
6 R013406 0.60 0.21
7 R013407 0.60 -0.77
8 R013408 0.68 -0.60 0.15
9 R013409 0.73 -1.19
10 R013410 0.97 -1.16 0.30
11 R013411 0.57 -1.42
12 R013413 0.51 -0.52
F11 1 R019301 0.42 0.71 0.00 0.00
2 R019401 1.12 0.32 0.61 -0.61
3 R019501 0.60 -0.48
4 R019601 1.43 0.34 0.17
5 R019701 0.93 0.46
6 R019801 0.62 -0.07 0.33
7 R019901 1.58 -0.07 0.13
8 R020001 0.51 -0.40 0.80 -0.80
9 R020101 0.97 -0.50 0.33
10 R020201 0.95 -0.47
R3 1 R060101 0.66 -0.98 0.30
2 R060102 1.09 -0.67 0.30
3 R060103 0.61 -1.21
4 R060104 0.80 -1.62 0.27
5 R060105 0.77 -0.77
6 R060106 1.13 -0.89 0.20
7 R060107 1.05 0.04 0.24
8 R060108 0.57 -0.23 0.10 0.57 -0.67
9 R060109 0.75 -0.36 0.16
10 R060110 0.60 0.42 0.29
R4 1 R060301 0.59 -1.81
2 R060302 1.04 -1.11 0.23
3 R060304 0.95 -1.01 0.32
4 R060305 0.66 0.77 1.89 -1.89
5 R060303 1.32 -0.13 0.20
6 R060306 0.73 0.46 1.31 -1.31
7 R060307 0.66 -0.49 0.23
8 R060308 0.79 -0.06 0.22
9 R060309 0.41 -0.64
10 R060310 1.43 -0.30 0.25
R7 1 R062201 0.76 -2.07 0.25
2 R062202 0.92 -0.52 0.38
3 R062203 0.93 -0.55
4 R062204 0.63 -1.09 0.33
5 R062205 0.79 0.16
6 R062206 0.83 -0.28 0.16
7 R062207 0.68 0.15 1.31 -1.03 -0.27
8 R062208 0.42 -0.75 0.21
9 R062209 1.12 0.13 0.30
10 R062210 0.84 0.81 1.38 -1.38
11 R062211 1.14 -0.72 0.26
R8 1 R062301 1.21 -0.76 0.22
2 R062302 1.21 -1.18 0.37
3 R062303 0.76 1.04 1.11 -1.11
4 R062304 1.02 0.45 0.86 -0.86
5 R062305 1.25 -0.55 0.26
6 R062307 1.05 -0.17 0.43
7 R062308 0.51 0.55 -0.46 1.59 -1.12
8 R062309 1.30 -0.60 0.30
9 R062310 1.45 0.12 0.33
10 R062311 0.68 -0.38 0.06 -0.06
R9 1 R062501 0.91 -1.12 0.47 -0.47
2 R062502 1.02 -0.12 0.32
3 R062511 1.25 -0.14 0.30
4 R062505 0.63 0.29 1.01 -1.01
5 R062507 1.07 0.12 0.34
6 R062508 0.53 0.17 0.95 -0.22 -0.73
7 R062509 1.07 0.94 0.27
8 R062503 0.63 0.32 0.42 -0.42
9 R062510 0.74 -0.11 0.26
R10 1 R062701 1.20 -0.74 0.15
2 R062702 0.76 -0.13 0.22
3 R062703 0.46 -0.82 0.28
4 R062704 1.08 0.42 0.32
5 R062705 0.80 0.28 0.90 -0.90
6 R062706 0.66 0.30 0.74 -0.08 -0.66
7 R062707 1.49 -0.22 0.33
8 R062708 0.80 -0.78
9 R062709 1.00 0.79 0.42
10 R062710 0.77 0.54 0.55 -0.55
R11 1 R062901 1.59 -0.47 0.32
2 R062902 0.51 0.11 0.91 -0.91
3 R062903 0.57 0.53 0.97 -0.97
4 R062904 0.46 -0.67 0.23
5 R062905 0.80 0.16 0.27
6 R062908 0.64 0.40 0.70 -0.66 -0.05
7 R062906 1.22 0.93 0.12
8 R062907 0.48 -0.17 0.25
9 R062909 0.58 0.66 0.31 -0.31
10 R062910 1.16 -1.13 0.30
R12 1 R063102 1.39 -1.07 0.51
2 R063103 1.38 0.18 0.30
3 R063101 0.79 -0.20 0.56 -0.56
4 R063104 0.93 -0.88 0.22
5 R063105 0.68 0.56 1.13 -0.83 -0.30
6 R063106 0.98 -0.83 0.23
7 R063801 0.46 -0.34 0.06 -0.06
8 R063802 1.30 -0.21 0.30
9 R063108 1.41 -0.55 0.33
10 R063109 0.73 -0.27 -1.70 1.70
11 R063110 0.90 0.36 0.27
R13 1 R063201 0.94 -1.74 0.26
2 R063901 1.00 -0.45 0.19
3 R063203 1.23 -0.78 0.21
4 R063204 0.75 -0.35 0.19 -0.19
5 R063902 1.02 1.09 0.16
6 R063206 1.06 -0.90 0.33
7 R063207 0.58 -0.61 0.39 0.11 -0.49
8 R063210 0.58 1.04 1.68 -1.68
9 R063209 1.04 -0.95 0.31
10 R063208 0.63 0.03 0.75 -0.75

Last updated 03 June 2016 (GF)