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HomeTDWNAEP Analysis and ScalingEstimation of NAEP Score ScalesNAEP Assessment IRT ParametersReading Assessment IRT ParametersIRT Parameters for Items in the Reading for Literary Experience Subscale, Grade 8 Reading Combined National and State Assessment, by Block and Item: 2017

NAEP Technical DocumentationIRT Parameters for Items in the Reading for Literary Experience Subscale, Grade 8 Reading Combined National and State Assessment, by Block and Item: 2017

IRT parameters for items in the reading for literary experience subscale, grade 8 reading combined national and state assessment, by block and item: 2017
BlockItemNAEP ID aj bj cj dj1 dj2 dj3 dj4 dj5
R11R0596010.500.180.12
2R0596020.55-0.880.20
3R0596030.92-0.870.23
4R0596040.78-1.29
5R0596100.43-0.150.160.30-0.46
6R0596060.72-0.610.56-0.56
7R0596050.800.530.80-0.80
8R0596080.650.290.19
9R0596090.74-1.720.15
10R0596070.62-0.290.77-0.77
R21R0698010.37-1.313.21-3.21
2R0698020.78-0.070.13
3R0698031.23-0.830.31
4R0698040.820.311.19-1.19
5R0698050.780.070.38
6R0698060.60-0.201.740.07-1.81
7R0698071.05-0.560.22
8R0698080.77-0.850.24
9R0698090.82-0.850.19
10R0698100.54-0.050.05-0.05
R51R0795011.49-0.980.18
2R0795020.53-2.310.13
3R0795040.44-0.34-0.620.62
4R0795050.82-1.210.07
5R0795060.50-1.110.14
6R0795070.49-0.490.59-0.36-0.24
7R0795080.89-1.21
8R0795090.87-0.900.22
9R0795100.57-0.440.76-0.76
10R0795111.16-0.970.10
R61R0586010.86-0.860.09
2R0586020.57-0.270.94-0.94
3R0586031.28-0.820.38
4R0586041.36-0.790.23
5R0586050.64-0.710.13
6R0586060.64-0.120.36-0.36
7R0586071.39-0.740.31
8R0586080.720.211.33-0.40-0.93
9R0586090.84-0.380.09
10R0586100.83-1.380.20
R91R0605010.41-0.830.14
2R0605021.40-1.780.14
3R0605030.69-0.260.56-0.56
4R0605040.94-0.560.21
5R0605050.58-0.261.02-0.79-0.23
6R0605070.680.141.35-1.35
7R0605080.670.930.71-0.71
8R0605090.55-0.210.20-0.20
9R0605100.82-0.720.49
10R0605110.53-1.600.18
R101R0606010.75-0.320.14
2R0606020.57-1.350.13
3R0606070.75-0.651.46-1.46
4R0606040.58-1.510.15
5R0606050.76-0.361.55-1.55
6R0606060.431.602.05-1.59-0.46
7R0606100.87-0.270.27
8R0606080.60-0.070.32-0.32
9R0606091.13-1.070.14
10R060603
0.73-0.020.60-0.60
† Not applicable; c parameters are not estimated for the two-parameter logistic model or generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models.
NOTE: For item jaj 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 assumed to be exactly zero and is not estimated 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), 2017 Reading Assessment.

Last updated 11 May 2022 (SK)