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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Reading Long-Term Trend Assessment IRT Parameters → IRT Parameters for Items in the Univariate Scale, Age 13 Reading Long-Term Trend National Assessment, by Block and Item: 2020
NAEP Technical DocumentationIRT Parameters for Items in the Univariate Scale, Age 13 Reading Long-Term Trend National Assessment, by Block and Item: 2020
| Item | NAEP ID | a | b | c | d | d | d | d |
|---|---|---|---|---|---|---|---|---|
| Not applicable; c parameters are not estimated for the two-parameter logistic or generalized partial credit models, and d parameters are not estimated for the two-parameter or three-parameter logistic models. | ||||||||
| For item j, a represents the discriminatory power of the item, b represents a location parameter related to item difficulty, c represents the guessing parameter, and d 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, d may not sum to zero because of rounding. | ||||||||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2020 Reading Long-Term Trend Assessment. | ||||||||
| Block R1 | ||||||||
| 1 | N023701 | 0.85 | -2.45 | 0.23 | ||||
| 2 | N023702 | 1.05 | -1.36 | 0.22 | ||||
| 3 | N021201 | 1.31 | -1.36 | 0.28 | ||||
| 4 | N021202 | 0.84 | 0.08 | 0.18 | ||||
| 5 | N021203 | 0.31 | -0.51 | 3.02 | 0.63 | -1.29 | -2.35 | |
| 6 | N021301 | 1.01 | -0.96 | 0.21 | ||||
| 7 | N021302 | 1.41 | 0.26 | 0.13 | ||||
| 8 | N021303 | 1.02 | -0.05 | 0.16 | ||||
| 9 | N023101 | 1.06 | -0.11 | 0.28 | ||||
| 10 | N023102 | 1.35 | -0.01 | 0.28 | ||||
| Block R2 | ||||||||
| 1 | N021401 | 0.47 | -1.11 | 0.28 | ||||
| 2 | N021402 | 0.51 | -0.69 | 0.17 | ||||
| 3 | N021403 | 1.50 | 0.00 | 0.27 | ||||
| 4 | N021501 | 1.19 | -1.17 | 0.29 | ||||
| 5 | N021502 | 1.01 | -0.73 | 0.26 | ||||
| 6 | N021503 | 0.92 | -1.61 | 0.23 | ||||
| 7 | N023801 | 1.38 | -1.31 | 0.25 | ||||
| 8 | N023802 | 0.54 | -0.70 | 0.24 | 1.53 | -1.77 | ||
| 9 | N023901 | 1.04 | 0.20 | 0.19 | ||||
| Block R3 | ||||||||
| 1 | N024001 | 1.04 | 0.18 | 0.29 | ||||
| 2 | N024002 | 1.43 | -0.67 | 0.23 | ||||
| 3 | N021801 | 0.83 | -1.22 | 0.26 | ||||
| 4 | N021802 | 0.81 | 0.24 | 0.28 | ||||
| 5 | N021803 | 0.28 | 0.94 | -1.13 | 1.13 | |||
| 6 | N022001 | 1.19 | -1.20 | 0.30 | ||||
| 7 | N022002 | 1.21 | -1.42 | 0.19 | ||||
| 8 | N022003 | 0.98 | -0.90 | 0.31 | ||||
| 9 | N022004 | 1.70 | -1.29 | 0.23 | ||||
| 10 | N023601 | 1.11 | -1.78 | 0.24 | ||||
| 11 | N023602 | 0.89 | -2.03 | 0.24 | ||||
| Block R4 | ||||||||
| 1 | N024101 | 0.61 | -0.72 | 0.23 | ||||
| 2 | N024102 | 1.42 | 1.01 | 0.15 | ||||
| 3 | N024103 | 0.98 | 0.12 | 0.28 | ||||
| 4 | N024104 | 0.78 | 0.55 | 0.44 | ||||
| 5 | N022101 | 1.38 | -1.38 | 0.32 | ||||
| 6 | N022102 | 1.35 | -0.04 | 0.17 | ||||
| 7 | N022103 | 0.61 | 0.20 | 2.18 | -0.05 | -2.13 | ||
| 8 | N024201 | 0.98 | -1.28 | 0.22 | ||||
| 9 | N024202 | 0.86 | -0.63 | 0.17 | ||||
| 10 | N024203 | 1.27 | -0.59 | 0.30 | ||||
| 11 | N024204 | 0.50 | -1.71 | 0.22 | ||||
| Block R6 | ||||||||
| 1 | N024501 | 1.08 | -0.84 | 0.39 | ||||
| 2 | N024502 | 0.78 | -0.38 | 0.21 | ||||
| 3 | N024503 | 1.21 | 0.34 | 0.28 | ||||
| 4 | N024504 | 1.54 | 1.61 | 0.27 | ||||
| 5 | N024601 | 0.85 | -0.71 | 0.23 | ||||
| 6 | N024602 | 1.14 | -1.35 | 0.27 | ||||
| 7 | N024603 | 1.11 | -1.23 | 0.24 | ||||
| 8 | N024604 | 1.34 | -1.38 | 0.24 | ||||
| 9 | N024605 | 0.92 | -0.74 | 0.28 | ||||
| 10 | N024701 | 1.05 | -0.75 | 0.26 | ||||
| 11 | N024801 | 0.98 | -1.72 | 0.24 | ||||
| 12 | N024802 | 1.17 | -1.21 | 0.24 | ||||
| 13 | N022901 | 0.63 | -2.71 | 0.21 | ||||
| Block R7 | ||||||||
| 1 | N024901 | 0.71 | -0.42 | 0.23 | ||||
| 2 | N024902 | 0.84 | -1.95 | 0.32 | ||||
| 3 | N024903 | 0.83 | -2.08 | 0.29 | ||||
| 4 | N025001 | 0.72 | -0.57 | 0.37 | ||||
| 5 | N025002 | 1.12 | -0.81 | 0.28 | ||||
| 6 | N025003 | 0.80 | -0.66 | 0.25 | ||||
| 7 | N025101 | 0.68 | 0.48 | 0.27 | ||||
| 8 | N022301 | 1.80 | -1.01 | 0.25 | ||||
| 9 | N025201 | 1.13 | -0.63 | 0.24 | ||||
| 10 | N025202 | 0.78 | -0.30 | 0.34 | ||||
| 11 | N025301 | 0.77 | 0.11 | 0.24 | ||||
| Block R8 | ||||||||
| 1 | N031001 | 1.04 | 0.07 | 0.32 | ||||
| 2 | N031002 | 1.24 | -0.82 | 0.26 | ||||
| 3 | N033801 | 0.40 | -1.91 | 0.25 | ||||
| 4 | N033803 | 0.73 | -2.39 | 0.21 | ||||
| 5 | N034201 | 0.78 | -1.34 | 0.23 | ||||
| 6 | N034202 | 1.32 | 0.50 | 0.29 | ||||
| 7 | N034203 | 0.48 | 0.10 | 1.18 | 0.66 | -1.31 | -0.53 | |
| 8 | N030001 | 1.08 | -0.67 | 0.16 | ||||
| 9 | N030002 | 1.07 | -0.55 | 0.28 | ||||
| Block R9 | ||||||||
| 1 | N028701 | 1.08 | -1.59 | 0.25 | ||||
| 2 | N028702 | 1.03 | -1.43 | 0.21 | ||||
| 3 | N028703 | 0.85 | -1.11 | 0.28 | ||||
| 4 | N028704 | 1.67 | -1.98 | 0.26 | ||||
| 5 | N028801 | 0.69 | -1.62 | 0.24 | ||||
| 6 | N028802 | 1.05 | -0.67 | 0.34 | ||||
| 7 | N029001 | 0.89 | 0.01 | 0.21 | ||||
| 8 | N029002 | 0.69 | 0.14 | 1.89 | -0.54 | -1.35 | ||
| 9 | N028901 | 0.76 | -1.15 | 0.25 | ||||
| 10 | N028902 | 0.85 | 0.00 | 0.26 | ||||
| Block R10 | ||||||||
| 1 | N027701 | 1.06 | -1.80 | 0.21 | ||||
| 2 | N027702 | 1.11 | -0.49 | 0.26 | ||||
| 3 | N027801 | 0.61 | -1.90 | 0.24 | ||||
| 4 | N027802 | 1.69 | -1.07 | 0.28 | ||||
| 5 | N027803 | 0.89 | -0.62 | 0.16 | ||||
| 6 | N027804 | 0.63 | -0.33 | 0.17 | ||||
| 7 | N027805 | 1.94 | -0.66 | 0.30 | ||||
| 8 | N027901 | 0.48 | -0.05 | 0.37 | ||||
| 9 | N027902 | 1.24 | -0.90 | 0.23 | ||||
| 10 | N027903 | 0.90 | -0.35 | 0.28 | ||||
| 11 | N027904 | 0.80 | -0.56 | 0.18 | ||||
Last updated 28 March 2024 (SK)