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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 for Literary Experience Scale, Grade 4 Reading Combined National and State Main Assessment, by Item and Block: 2009

NAEP Technical DocumentationIRT parameters for items in the reading for literary experience scale, grade 4 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.
F3 1 R053601 1.39 -0.95 0.25
2 R053701 0.84 -1.52 0.20
3 R053801 0.95 -1.03 0.27
4 R053901 0.73 0.39 1.21 -1.21
5 R054001 0.63 -0.57 1.55 -1.55
6 R054101 0.88 0.03 0.32
7 R054201 0.61 -0.06 1.03 0.01 -1.04
8 R054301 0.67 0.78 1.19 -1.19
9 R054401 1.02 -0.73 0.29
10 R054501 0.59 -0.68 0.26
F4 1 R052901 1.30 -1.26 0.43
2 R052902 0.85 -0.38 0.25
3 R052903 1.46 -0.41 0.22
4 R052904 0.69 -0.49 -0.04 0.04
5 R052905 1.80 -0.36 0.26
6 R052906 0.81 -0.35
7 R052907 0.62 -0.20 1.24 -0.14 -1.11
8 R052908 1.48 -0.55 0.22
9 R052909 0.89 -0.79
10 R052910 1.25 -0.48 0.28
F5 1 R012601 0.75 1.02
2 R012602 1.23 1.23 0.17
3 R012603 1.29 -0.15 0.19
4 R012604 0.99 1.10
5 R012605 0.65 0.86 0.24
6 R012606 1.46 0.24 0.36
7 R012607 0.78 1.19 1.06 -0.31 -0.74
8 R012608 0.46 -1.38 0.23
9 R012609 1.05 0.89 0.29
10 R012610 1.43 0.37 0.34
11 R012612 0.56 0.45
F9 1 R053001 0.59 -2.18 0.18
2 R053002 1.48 -0.90 0.39
3 R053003 0.93 -0.84
4 R053004 0.61 -0.74 0.41 -0.41
5 R053005 0.64 -1.17 0.17
6 R053006 0.43 -0.20 0.13 -0.20 0.07
7 R053007 0.67 -2.02 0.12
8 R053008 0.73 -1.44 0.23
9 R053009 0.67 -1.24
10 R053010 0.59 -1.72
F11 1 R021601 0.53 -1.61 0.19
2 R020401 0.74 -1.98
3 R020601 1.29 -1.58 0.20
4 R021101 0.51 -1.87 0.07
5 R020701 0.88 -0.91
6 R020501 0.92 0.17 0.12
7 R022101 1.51 -1.15 0.19
8 R021701 0.45 0.30 1.33 -1.33
9 R022201 1.18 -1.69 0.32
10 R021201 0.36 -1.28 0.32 -0.32
R1 1 R057701 0.60 0.20 0.27
2 R057702 0.70 -1.59 0.18
3 R057703 1.35 -1.34 0.30
4 R057704 0.68 -0.53
5 R057705 0.51 -0.53 0.77 -0.77
6 R057706 0.67 -0.28 0.88 -0.88
7 R057707 0.51 0.92 0.82 -0.07 -0.75
8 R057708 0.84 0.08 0.17
9 R057709 0.62 -1.10 0.20
10 R057710 0.65 0.08 1.00 -1.00
11 R057711 1.17 0.70 0.19
R2 1 R057801 1.18 -1.04 0.36
2 R057802 1.13 -0.20 0.28
4 R057804 0.91 -0.62 0.28
5 R057805 0.50 -0.49 0.17
6 R057806 0.50 0.37 1.99 0.28 -2.27
7 R057807 0.75 -1.25
8 R057808 0.98 0.83 0.28
9 R057809 0.54 0.24 1.61 -1.61
R3 1 R058001 0.95 0.15 0.22
2 R058002 1.00 0.22 0.26
3 R058003 0.63 -0.05 1.24 -1.24
4 R058004 0.52 -0.49 0.85 -0.85
5 R058005 0.86 -0.28 0.21
6 R058006 0.43 0.61 1.07 -1.27 0.19
7 R058007 0.71 -0.20
8 R058008 0.49 1.01 1.46 -1.46
9 R058009 0.71 0.79 0.24
10 R058010 1.04 0.04 0.27
R5 1 R058501 1.15 0.23 0.15
2 R058502 1.38 0.57 0.28
3 R058503 1.07 0.63 0.26
4 R058504 0.44 0.10 1.22 -1.22
5 R058505 1.20 0.92 0.13
6 R058506 0.80 0.16 0.25
7 R058507 0.98 0.57 0.26
8 R058508 0.55 0.38 0.60 0.17 -0.77
9 R058509 0.62 0.90
10 R058510 0.78 0.17 0.21
R6 1 R058601 1.06 -0.03 0.17
2 R058602 0.61 0.66 0.69 -0.69
3 R058603 1.02 -0.14 0.35
4 R058604 1.16 0.14 0.23
5 R058605 1.23 0.57 0.19
6 R058606 0.58 1.01 0.52 -0.52
7 R058607 1.37 0.30 0.34
8 R058608 0.58 1.10 1.51 -0.55 -0.96
9 R058609 0.85 0.35 0.15
10 R058610 1.41 0.10 0.27

Last updated 03 June 2016 (GF)