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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Reading Assessment IRT Parameters → IRT Parameters for Items in the Literary Subscale, Grade 12 Reading National Assessment, by Item and Block: 2015
NAEP Technical DocumentationIRT Parameters for Items in the Literary Subscale, Grade 12 Reading National Assessment, by Item and Block: 2015
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 | dj5 |
|---|---|---|---|---|---|---|---|---|---|---|
| R1 | 1 | R059601 | 0.54 | 0.01 | 0.14 | † | † | † | † | † |
| 2 | R059602 | 0.62 | -0.91 | 0.24 | † | † | † | † | † | |
| 3 | R059603 | 0.86 | -0.85 | 0.23 | † | † | † | † | † | |
| 4 | R059604 | 0.86 | -1.71 | † | † | † | † | † | † | |
| 5 | R059610 | 0.40 | -0.36 | † | 0.09 | -0.22 | 0.13 | † | † | |
| 6 | R059606 | 0.69 | -0.97 | † | 0.25 | -0.25 | † | † | † | |
| 7 | R059605 | 0.71 | 0.31 | † | 0.58 | -0.58 | † | † | † | |
| 8 | R059608 | 0.58 | -1.10 | 0.28 | † | † | † | † | † | |
| 9 | R059609 | 0.84 | -1.99 | 0.23 | † | † | † | † | † | |
| 10 | R059607 | 0.50 | -1.27 | † | -0.16 | 0.16 | † | † | † | |
| R2 | 1 | R069801 | 0.44 | -1.47 | † | 2.38 | -2.38 | † | † | † |
| 2 | R069802 | 0.78 | -0.51 | 0.12 | † | † | † | † | † | |
| 3 | R069803 | 1.40 | -1.24 | 0.20 | † | † | † | † | † | |
| 4 | R069804 | 0.93 | -0.51 | † | 0.84 | -0.84 | † | † | † | |
| 5 | R069805 | 0.66 | -0.42 | 0.26 | † | † | † | † | † | |
| 6 | R069806 | 0.51 | -0.44 | † | 1.65 | 0.20 | -1.85 | † | † | |
| 7 | R069807 | 0.95 | -1.23 | 0.22 | † | † | † | † | † | |
| 8 | R069808 | 0.89 | -1.43 | 0.22 | † | † | † | † | † | |
| 9 | R069809 | 0.73 | -1.45 | 0.22 | † | † | † | † | † | |
| 10 | R069810 | 0.50 | -0.36 | † | 0.22 | -0.22 | † | † | † | |
| R5 | 1 | R061601 | 1.27 | -1.07 | 0.29 | † | † | † | † | † |
| 2 | R061602 | 0.79 | -0.63 | † | 0.04 | -0.04 | † | † | † | |
| 3 | R061603 | 1.05 | -1.51 | 0.23 | † | † | † | † | † | |
| 4 | R061604 | 0.65 | -0.94 | † | 1.32 | -1.32 | † | † | † | |
| 5 | R061605 | 1.28 | 0.03 | 0.32 | † | † | † | † | † | |
| 6 | R061606 | 0.74 | 0.60 | † | 0.15 | -0.15 | † | † | † | |
| 7 | R061607 | 0.75 | 0.00 | † | 0.93 | 0.42 | -1.34 | † | † | |
| 8 | R061608 | 1.21 | 1.38 | † | † | † | † | † | † | |
| 9 | R061609 | 1.26 | 1.15 | 0.22 | † | † | † | † | † | |
| R6 | 1 | R078901 | 0.80 | 0.55 | 0.17 | † | † | † | † | † |
| 2 | R078902 | 0.86 | -1.32 | 0.20 | † | † | † | † | † | |
| 3 | R078903 | 0.58 | -0.31 | † | 0.37 | -0.37 | † | † | † | |
| 4 | R078904 | 0.88 | 1.02 | 0.22 | † | † | † | † | † | |
| 5 | R078905 | 0.50 | 0.74 | † | 1.53 | -0.50 | -1.03 | † | † | |
| 6 | R078906 | 1.07 | 0.07 | 0.18 | † | † | † | † | † | |
| 7 | R078907 | 0.84 | -0.02 | † | † | † | † | † | † | |
| 8 | R078908 | 0.25 | -0.44 | 0.19 | † | † | † | † | † | |
| 9 | R078909 | 1.31 | -0.19 | 0.20 | † | † | † | † | † | |
| 10 | R078910 | 1.42 | -0.55 | 0.28 | † | † | † | † | † | |
| † 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 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 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), 2015 Reading Assessment. | ||||||||||
Last updated 17 November 2021 (ML)