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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 8 Reading Combined National and State Main Assessment, by Item and Block: 2009

NAEP Technical DocumentationIRT parameters for items in the reading to gain information scale, grade 8 reading combined national and state 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 0.71 0.75 1.14 -0.10 -1.05
2 R013202 0.72 -0.71 0.21
3 R013203 1.05 -2.03
4 R013204 1.03 -0.33 0.31
5 R013205 0.98 -1.53
6 R013206 0.75 -0.10 0.19
7 R013207 0.60 -0.90
8 R013208 1.62 -0.33 0.22
9 R013209 0.69 1.17
10 R013210 0.90 2.20 0.36
11 R013211 0.43 0.22
12 R013212 0.50 1.43 1.59 -0.77 -0.83
F7 1 R034501 0.92 -0.57 0.36
2 R034601 0.22 -1.93 -1.81 1.81
3 R034701 0.25 -1.54 0.24
4 R034801 1.22 -1.70 0.39
5 R034901 0.62 -0.64 0.90 -0.90
6 R035001 0.49 -1.29 0.72 -0.72
7 R035101 0.93 -0.26 0.25
8 R035201 0.51 -0.82 -1.40 1.40
9 R035301 0.45 -0.41 1.16 0.10 -1.27
10 R035401 1.01 -1.44 0.51
F8 1 R053401 0.43 -0.09 0.73 -0.73
2 R053402 0.77 -2.02
3 R053403 1.61 -0.80 0.32
4 R053404 0.84 0.38 0.20
5 R053405 0.44 -0.68 1.98 -1.85 -0.13
6 R053406 1.32 -0.88 0.23
7 R053407 0.99 -1.47 0.29
8 R053408 0.38 -1.86
9 R053409 0.70 -0.33 0.33
10 R053410 0.39 -1.26
11 R053411 1.20 -0.16 0.34
F14 1 R027301 1.09 -1.14 0.62
2 R026401 0.97 -1.11 0.33
3 R026501 0.51 -0.04
4 R027101 1.44 -0.83 0.31
5 R026601 1.66 -1.03 0.46
6 R028201 1.06 0.16 0.25
7 R026801 0.41 -0.01 -0.14 1.41 -1.28
8 R027201 0.54 -0.66 0.93 -0.93
9 R026901 1.69 -0.23 0.31
10 R027001 0.67 -1.29
R3 1 R060101 0.63 -0.39 0.40
2 R060102 0.82 -0.17 0.29
3 R060103 0.62 -0.61
4 R060104 1.02 -0.49 0.35
5 R060105 0.90 -0.13
6 R060106 1.06 -0.35 0.19
7 R060107 1.10 0.64 0.20
8 R060108 0.55 0.31 0.36 0.54 -0.89
9 R060109 1.08 0.74 0.21
10 R060110 0.66 0.83 0.22
R4 1 R060301 0.67 -1.24
2 R060302 0.87 -0.50 0.24
3 R060304 1.06 0.12 0.59
4 R060305 0.75 1.30 1.77 -1.77
5 R060303 1.47 0.46 0.20
6 R060306 0.70 0.93 1.38 -1.38
7 R060307 0.82 0.10 0.20
8 R060308 0.85 0.68 0.24
9 R060309 0.36 -0.06
10 R060310 1.32 0.27 0.28
R7 1 R058801 1.87 -0.95 0.36
2 R058802 1.21 -1.61 0.23
3 R058803 1.79 -1.09 0.27
4 R058804 0.86 -0.99 0.25
5 R058805 0.25 0.42
6 R058806 0.56 -0.19 0.24
7 R058807 0.41 -1.39 0.43 0.77 -1.20
8 R058808 0.95 -0.54 0.27
9 R058809 1.07 -0.74 0.24
10 R058810 0.40 -0.97 1.40 -1.40
R8 1 R059101 0.40 -0.06 0.23
2 R059102 0.82 -1.78 0.29
3 R059103 0.85 -0.53 0.21
4 R059104 1.30 -1.71 0.32
5 R059109 0.46 -0.17 0.56 -0.56
6 R059106 0.46 0.03 1.88 -0.56 -1.32
7 R059105 0.98 -0.41 0.26
8 R059107 0.44 -1.53 0.14
9 R059108 0.39 -0.36 -0.52 0.52
10 R059110 0.54 -0.80
R11 1 R060801 1.29 0.04 0.22
2 R060803 0.64 0.27 1.06 -1.06
3 R060804 1.00 -0.37 0.38
4 R060805 0.75 0.42 0.30
5 R060806 1.28 -0.73 0.32
6 R060807 0.67 -0.71
7 R060808 0.47 0.63 0.62 0.06 -0.68
8 R060802 0.41 0.72 0.31
9 R060809 1.78 0.06 0.27
10 R060810 0.46 0.49 0.90 -0.90
11 R060811 0.36 -0.82 0.51 -0.51
R12 1 R061101 0.78 0.26 0.20
2 R061102 1.24 -0.38 0.34
3 R063601 1.44 -0.83 0.25
4 R061104 0.57 -0.71 0.18 -0.18
5 R061105 0.99 0.29 0.23
6 R061106 0.44 0.07 1.04 -0.58 -0.46
7 R061107 1.33 -0.25 0.26
8 R061108 1.00 -0.07 0.21
9 R061109 1.63 -0.12 0.23
10 R061110 0.82 1.06
11 R061111 0.28 -1.70 -0.90 0.90
R13 1 R061301 0.64 -1.24 1.02 -1.02
2 R061302 0.72 -1.55 0.28
3 R061303 0.64 0.18 1.49 -1.49
4 R061304 0.53 0.41
5 R061305 0.84 -1.47 0.24
6 R061306 1.03 -0.52 0.20
7 R061307 0.49 -0.36 1.01 -0.20 -0.81
8 R061308 0.62 0.09 0.32
9 R061309 0.35 -0.82 -0.02 0.02
F10 1 R013401 1.09 0.19 0.19
2 R013402 0.86 -0.22
3 R013403 0.45 0.54 -2.12 2.12
4 R013404 0.93 -0.48 0.32
5 R013405 0.98 -0.21
6 R013406 0.62 0.55
7 R013407 0.71 0.00
8 R013408 0.63 -0.20 0.21
9 R013409 0.78 -0.24
10 R013410 1.06 -0.18 0.33
11 R013411 0.49 -1.03
12 R013413 0.52 0.00
F11 1 R013001 0.70 -1.16
2 R013002 1.61 -0.66 0.20
3 R013003 0.95 -0.57
4 R013004 0.33 0.94 -0.20 0.20
5 R013005 0.65 -1.10
6 R013006 1.23 -0.21 0.27
7 R013007 0.55 -1.78
8 R013008 0.62 0.40
9 R013009 0.79 -1.06
10 R013010 0.84 -1.00
11 R013011 0.48 -0.46
12 R013012 1.00 -0.28 0.25
F15 1 R028301 0.71 -2.02 0.26
2 R028401 0.36 -1.36 -0.01 0.01
3 R028501 0.51 -1.37 0.72 -0.72
4 R029501 1.41 -0.36 0.26
5 R029701 1.05 -1.82 0.37
6 R028801 0.29 -1.69 1.94 -1.39 -0.54
7 R029001 0.88 -0.97 0.41
8 R029901 0.86 -0.19 0.24
9 R029601 0.34 -1.84 1.40 -1.40
10 R029801 0.90 -1.92 0.33

Last updated 03 June 2016 (GF)