Table of Contents | Search Technical Documentation | References
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 9 Reading Long-Term Trend National Assessment, by Block and Item: 2020
NAEP Technical DocumentationIRT Parameters for Items in the Univariate Scale, Age 9 Reading Long-Term Trend National Assessment, by Block and Item: 2020
| Item | NAEP ID | a | b | c | 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 | N021101 | 1.85 | 0.05 | 0.27 | ||||
| 2 | N021102 | 1.49 | -0.42 | 0.30 | ||||
| 3 | N021201 | 1.89 | -0.07 | 0.30 | ||||
| 4 | N021202 | 0.86 | 1.47 | 0.18 | ||||
| 5 | N021203 | 0.47 | 1.58 | 1.00 | -0.14 | -0.86 | ||
| 6 | N021301 | 1.45 | 0.09 | 0.24 | ||||
| 7 | N021302 | 1.90 | 1.04 | 0.11 | ||||
| 8 | N021303 | 1.35 | 1.10 | 0.19 | ||||
| Block R2 | ||||||||
| 1 | N021401 | 0.50 | -0.20 | 0.28 | ||||
| 2 | N021402 | 0.83 | 0.50 | 0.19 | ||||
| 3 | N021403 | 1.57 | 1.35 | 0.22 | ||||
| 4 | N021501 | 1.79 | -0.09 | 0.26 | ||||
| 5 | N021502 | 1.16 | 0.22 | 0.23 | ||||
| 6 | N021503 | 1.19 | -0.50 | 0.20 | ||||
| 7 | N021601 | 1.53 | -0.33 | 0.27 | ||||
| 8 | N021602 | 1.01 | 0.41 | 0.38 | ||||
| 9 | N021603 | 0.95 | 0.84 | 0.22 | ||||
| 10 | N021701 | 1.32 | -0.98 | 0.26 | ||||
| Block R3 | ||||||||
| 1 | N021801 | 1.23 | -0.02 | 0.35 | ||||
| 2 | N021802 | 1.11 | 1.31 | 0.36 | ||||
| 3 | N021803 | 0.57 | 0.05 | 1.72 | -1.72 | |||
| 4 | N022001 | 1.51 | -0.15 | 0.25 | ||||
| 5 | N022002 | 1.27 | -0.41 | 0.21 | ||||
| 6 | N022003 | 1.09 | 0.09 | 0.37 | ||||
| 7 | N022004 | 2.14 | -0.25 | 0.28 | ||||
| Block R4 | ||||||||
| 1 | N022101 | 1.71 | -0.26 | 0.34 | ||||
| 2 | N022102 | 2.34 | 0.96 | 0.20 | ||||
| 3 | N022103 | 0.70 | 1.33 | 2.13 | -0.26 | -1.87 | ||
| 4 | N022201 | 1.38 | 0.87 | 0.39 | ||||
| 5 | N022202 | 1.47 | -0.62 | 0.25 | ||||
| 6 | N022203 | 1.34 | -0.08 | 0.19 | ||||
| 7 | N022204 | 1.83 | 0.55 | 0.24 | ||||
| 8 | N022205 | 1.80 | 0.49 | 0.20 | ||||
| Block R6 | ||||||||
| 1 | N022701 | 1.08 | -0.44 | 0.34 | ||||
| 2 | N022702 | 1.52 | -0.28 | 0.22 | ||||
| 3 | N022703 | 1.43 | -0.84 | 0.35 | ||||
| 4 | N022704 | 1.86 | -0.42 | 0.20 | ||||
| 5 | N022801 | 1.23 | -1.84 | 0.22 | ||||
| 6 | N022901 | 0.69 | -1.65 | 0.19 | ||||
| 7 | N023001 | 1.18 | 0.07 | 0.21 | ||||
| 8 | N023002 | 1.30 | 0.60 | 0.26 | ||||
| 9 | N023101 | 1.62 | 0.62 | 0.27 | ||||
| 10 | N023102 | 1.30 | 0.54 | 0.29 | ||||
| Block R7 | ||||||||
| 1 | N023301 | 1.23 | 0.09 | 0.25 | ||||
| 2 | N023401 | 0.76 | -0.81 | 0.27 | ||||
| 3 | N023402 | 1.78 | 0.20 | 0.34 | ||||
| 4 | N023403 | 0.91 | -0.53 | 0.28 | ||||
| 5 | N023501 | 1.77 | 0.11 | 0.40 | ||||
| 6 | N023502 | 1.17 | -0.09 | 0.25 | ||||
| 7 | N023601 | 1.49 | -0.30 | 0.35 | ||||
| 8 | N023602 | 0.89 | -1.09 | 0.21 | ||||
| Block R8 | ||||||||
| 1 | N033801 | 0.65 | -1.47 | 0.22 | ||||
| 2 | N033803 | 0.84 | -1.59 | 0.24 | ||||
| 3 | N033901 | 1.02 | -0.05 | 0.26 | ||||
| 4 | N033902 | 1.45 | -0.10 | 0.25 | ||||
| 5 | N033903 | 1.93 | 0.13 | 0.13 | ||||
| 6 | N030001 | 1.40 | 0.18 | 0.18 | ||||
| 7 | N030002 | 1.69 | -0.10 | 0.24 | ||||
| 8 | N034101 | 2.01 | -0.43 | 0.29 | ||||
| 9 | N034102 | 1.82 | -0.53 | 0.30 | ||||
| Block R9 | ||||||||
| 1 | N028601 | 1.44 | -1.10 | 0.25 | ||||
| 2 | N028602 | 1.50 | -0.82 | 0.26 | ||||
| 3 | N028701 | 1.62 | -0.28 | 0.37 | ||||
| 4 | N028702 | 1.45 | -0.22 | 0.25 | ||||
| 5 | N028703 | 1.18 | -0.18 | 0.25 | ||||
| 6 | N028704 | 1.68 | -0.75 | 0.30 | ||||
| 7 | N028801 | 1.20 | 0.21 | 0.21 | ||||
| 8 | N028802 | 0.78 | 0.27 | 0.24 | ||||
| 9 | N028901 | 1.20 | 0.31 | 0.31 | ||||
| 10 | N028902 | 1.57 | 1.11 | 0.23 | ||||
| Block R10 | ||||||||
| 1 | N027001 | 1.60 | -0.66 | 0.18 | ||||
| 2 | N027002 | 1.19 | -0.38 | 0.22 | ||||
| 3 | N027003 | 1.06 | -1.09 | 0.16 | ||||
| 4 | N027101 | 1.65 | 0.09 | 0.26 | ||||
| 5 | N027102 | 1.21 | -0.06 | 0.31 | ||||
| 6 | N027201 | 1.34 | 0.33 | 0.16 | ||||
| 7 | N027202 | 1.52 | -0.30 | 0.28 | ||||
| 8 | N027203 | 2.01 | 0.37 | 0.24 | ||||
Last updated 28 March 2024 (SK)