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NAEP Analysis and ScalingEstimation of NAEP Score ScalesNAEP Assessment IRT ParametersTechnology and Engineering Literacy IRT Parameters → IRT Parameters for the Univariate Scale, Grade 8 Technology and Engineering Literacy (TEL) National Assessment, by Item and Assembly Unit: 2014

NAEP Technical DocumentationIRT Parameters for the Univariate Scale, Grade 8 Technology and Engineering Literacy (TEL) National Assessment, by Item and Assembly Unit: 2014

IRT parameters for the univariate scale, grade 8 technology and engineering literacy (TEL) national assessment, by item and assembly unit: 2014
Assembly unitItemNAEP ID aj bj cj dj1 dj2 dj3 dj4 dj5
T11D0001CL0.602.33
2D0002CL0.680.26
3D0003CL0.74-1.360.59-0.59
4D0004010.710.370.13
5D0005CL0.92-0.550.43-0.43
6D0006010.83-0.55
7D0007011.23-1.10
8D0008010.57-0.400.95-0.95
9D0009CL0.36-1.53
10D0221010.460.040.25-0.25
11D0164010.530.700.29
12D0229CL0.660.85
T21D0010CL0.39-0.901.20-1.20
2D0011CL0.56-1.470.64-0.28-0.36
3D0012CL0.38-0.570.24-0.050.59-0.77
4D0013CL0.400.740.18-0.18
5D0014010.940.25
6D0015010.90-0.060.21
T31D0016CL0.74-1.410.28-0.28
2D0017010.91-0.540.19
3D0018010.86-0.27
4D0019010.900.090.21
5D0020CL0.840.02
6D0021010.930.760.26
7D0022010.600.761.61-1.61
8D0023CL0.64-1.08-0.340.34
9D0024010.62-0.040.36-0.36
10D0025010.87-0.58
11D0026010.77-0.66
T41D0027010.590.130.36
2D0028010.500.322.14-2.14
3D0029010.52-1.560.24
4D0030010.33-0.480.72-0.72
5D0031010.50-0.88
6D0032010.611.051.41-1.41
7D0033010.44-1.16-1.081.08
8D0034010.370.62
9D0035010.77-1.250.21
10D0036010.840.18
T51D0037010.92-0.69
2D0038010.97-0.94
3D0039010.75-2.22
4D0040010.65-0.86
5D0041010.37-0.87-0.850.85
6D0042010.501.72
7D0043010.720.97
8D0044010.51-1.03
9D0045CL0.38-0.60
10D0046010.97-0.81
11D0047010.33-1.45-0.080.08
T61D0048010.57-0.670.95-0.95
2D0049010.84-1.68
3D0050010.510.080.44-0.44
4D0050020.40-0.860.17-0.580.40
5D0051010.521.12
6D0052CL0.64-2.64
7D0053010.72-0.33-0.210.21
8D0054CL0.740.33
9D0055010.910.820.22
T71D0056010.47-0.39
2D0057010.76-1.050.16
3D0058010.91-0.48
4D0059010.510.76-0.040.81-0.77
5D0060CL0.60-0.740.23-0.12-0.220.11
6D0061010.590.89
7D0062010.451.440.93-0.93
8D0063CL0.920.55
T81D0181010.81-0.080.23
2D0208CL0.53-0.420.31-0.31
3D0140010.710.220.23
4D0222CL0.660.17
5D0230010.691.09
6D0068CL0.79-1.18-0.050.28-0.23
7D0069CL0.79-0.99
8D0070011.11-0.93
9D0071010.62-1.181.31-1.31
T91D0072010.46-0.610.88-0.46-0.42
2D0073010.36-1.72-0.810.81
3D0074CL0.34-0.841.23-1.23
4D0075CL0.39-0.45-0.190.19
5D0218010.97-1.90
6D0218020.790.29
7D0213CL0.60-0.77-0.150.15
8D0146010.65-0.32
9D0195011.510.510.23
10D0195020.610.500.19
11D0189010.870.890.18
12D0156011.111.290.23
T101D0191010.39-0.990.22
2D0191020.94-1.380.22
3D0226010.36-0.360.22-0.22
4D0186CL0.660.37
5D0141010.821.160.20
6D0234CL0.362.301.94-1.94
7D0185CL0.24-0.41-1.871.87
8D0187011.001.710.14
9D0076CL0.52-2.36-1.161.16
10D0077CL0.55-1.87
11D0078CL0.80-0.56
12D0081010.49-0.14-0.330.33
T111D0082010.67-1.750.22
2D0083CL0.46-0.091.43-1.43
3D0084010.41-0.800.19
4D0085010.32-3.280.22
5D0086CL0.70-0.99
6D0087010.52-0.680.17
7D0088010.54-0.721.06-0.62-0.43
8D0197CL0.50-0.66-0.430.43
9D0203CL0.45-0.270.31-0.31
10D0202011.060.76
11D0202020.920.16
T121D0139010.51-1.44
2D0138011.09-0.240.38
3D0138020.510.73-0.790.79
4D0183011.201.390.19
5D0089CL0.33-0.971.060.17-1.040.50-0.69
6D0090010.530.600.74-0.74
7D0091010.80-0.71
8D0092010.74-0.15
9D0093CL0.51-0.150.95-0.08-0.86
T131D0094CL0.46-4.24
2D0095CL0.56-0.81
3D0096010.830.68
4D0097CL0.19-0.181.80-1.80
5D0098010.750.45
6D0180010.53-0.96
7D0210011.02-0.050.21
8D0159CL0.33-0.182.34-2.34
9D0223CL0.420.33-0.650.65
10D0162CL0.220.56-1.201.20
11D0224010.850.98
T141D0148010.82-0.330.22
2D0192011.180.350.22
3D0151CL0.23-0.51-0.060.06
4D0184CL0.53-0.260.52-0.52
5D0165010.631.290.21
6D0167010.310.18-3.773.77
7D0167CL0.550.561.07-1.07
8D0099CL0.85-1.110.58-0.58
9D0100TL0.85-1.430.93-0.13-0.80
10D0102TL0.67-0.201.84-0.15-0.05-1.64
T151D0104010.83-0.730.18
2D0105010.410.940.31
3D0106010.630.220.41-0.41
4D0107010.66-1.47-0.130.13
5D0108010.58-0.24
6D0109010.59-1.360.47-0.47
7D0143010.36-0.770.16-0.16
8D0143020.47-2.000.21
9D0142010.851.340.24
10D0142CL0.311.12
11D0199010.930.920.23
T161D0179CL0.47-0.540.39-0.39
2D0179050.94-0.76
3D0154010.76-0.45
4D0154020.80-1.69
5D0110CL0.41-0.65-1.481.48
6D0111010.62-0.50-0.850.85
7D0112010.44-0.06
8D0113010.480.58
9D0114010.530.891.11-1.11
10D0115010.451.091.49-1.49
T171D0116CL0.62-1.46
2D0117160.49-0.331.53-1.53
3D0118CL0.53-2.10
4D0117TL0.300.220.29-0.29
5D0120CL0.74-2.70
6D0121CL0.32-2.561.65-1.65
7D0122CL0.80-1.31
8D0196010.66-0.89
9D0155010.89-0.100.23
10D0173010.550.520.17
11D0201010.830.650.26
12D0212CL0.840.961.10-1.10
13D0216CL0.282.071.32-1.32
T181D0217010.57-0.670.27
2D0177010.84-0.130.25
3D0144010.850.210.21
4D0147011.110.340.23
5D0153CL0.32-0.400.37-0.37
6D0219CL0.75-0.63
7D0178CL0.44-0.36
8D0123CL0.47-2.00-0.020.02
9D0124010.38-0.870.40-0.40
10D0125CL0.56-1.00-0.290.29
11D0126CL0.36-0.760.97-2.141.17
12D0127010.610.541.61-1.61
T191D0128CL0.42-0.56
2D0129CL0.57-1.71
3D0130010.51-1.110.23
4D0131011.020.040.21
5D0150CL0.38-1.39-0.080.27-0.19
6D0211010.84-0.43
7D0211020.53-0.67
8D0211030.71-1.04
9D0225CL0.52-0.50
10D0193CL0.50-0.22-0.070.07
11D0228010.800.13
12D0207010.64-0.13
13D0158CL1.271.15
T201D0220010.72-1.630.22
2D0163010.48-1.460.21
3D0190010.77-0.790.21
4D0169010.81-0.370.23
5D0182010.57-1.28
6D0188011.000.22
7D0188020.780.30
8D0188031.08-0.19
9D0174CL0.890.75
10D0174090.69-0.57
11D0132011.02-0.320.17
12D0133CL0.48-1.670.04-0.04
13D0134CL0.67-0.940.53-0.53
14D0135010.780.790.10
15D0136010.880.270.16
16D0137011.040.91
T211D0168010.39-1.720.23
2D0232CL0.29-1.50-1.061.06
3D0231010.38-0.92-1.241.24
4D0198010.46-0.89
5D0198020.61-0.06
6D0161010.68-0.16
7D0161020.650.25
8D0171010.380.66-0.210.21
9D0206010.511.03
10D0206020.510.73
11D0206030.991.780.26
† 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 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 is assumed to be exactly zero and is not estimated for items scaled with the two-paramer logistic model. For item j, dji may not sum to zero because of rounding.  In 2014, grades 4 and 12 were not assessed.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2014 TEL Assessment.


Last updated 30 August 2021 (ML)