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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 Combined National and State Assessment, By Item and Block: 2013
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 | dj5 |
|---|---|---|---|---|---|---|---|---|---|---|
| † 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), 2013 Reading Assessment. | ||||||||||
| R1 | 1 | R059601 | 0.56 | -0.05 | .17 | † | † | † | † | † |
| 2 | R059602 | 0.63 | -0.70 | .27 | † | † | † | † | † | |
| 3 | R059603 | 0.76 | -0.95 | .20 | † | † | † | † | † | |
| 4 | R059604 | 0.82 | -1.87 | † | † | † | † | † | † | |
| 5 | R059610 | 0.36 | -0.41 | † | -0.06 | -0.25 | 0.31 | † | † | |
| 6 | R059606 | 0.69 | -0.97 | † | 0.22 | -0.22 | † | † | † | |
| 7 | R059605 | 0.65 | 0.51 | † | 0.85 | -0.85 | † | † | † | |
| 8 | R059608 | 0.55 | -1.19 | .27 | † | † | † | † | † | |
| 9 | R059609 | 0.84 | -1.98 | .23 | † | † | † | † | † | |
| 10 | R059607 | 0.51 | -1.35 | † | -0.07 | 0.07 | † | † | † | |
| R2 | 1 | R069801 | 0.41 | -1.59 | † | 2.54 | -2.54 | † | † | † |
| 2 | R069802 | 0.79 | -0.44 | .14 | † | † | † | † | † | |
| 3 | R069803 | 1.35 | -1.26 | .21 | † | † | † | † | † | |
| 4 | R069804 | 0.98 | -0.51 | † | 0.85 | -0.85 | † | † | † | |
| 5 | R069805 | 0.62 | -0.48 | .25 | † | † | † | † | † | |
| 6 | R069806 | 0.54 | -0.56 | † | 1.25 | 0.39 | -1.64 | † | † | |
| 7 | R069807 | 1.13 | -1.03 | .30 | † | † | † | † | † | |
| 8 | R069808 | 0.96 | -1.42 | .20 | † | † | † | † | † | |
| 9 | R069809 | 0.83 | -1.20 | .30 | † | † | † | † | † | |
| 10 | R069810 | 0.50 | -0.38 | † | 0.11 | -0.11 | † | † | † | |
| R5 | 1 | R061601 | 1.41 | -0.82 | .43 | † | † | † | † | † |
| 2 | R061602 | 0.72 | -0.65 | † | -0.05 | 0.05 | † | † | † | |
| 3 | R061603 | 1.11 | -1.42 | .34 | † | † | † | † | † | |
| 4 | R061604 | 0.68 | -1.05 | † | 1.16 | -1.16 | † | † | † | |
| 5 | R061605 | 1.28 | 0.04 | .29 | † | † | † | † | † | |
| 6 | R061606 | 0.73 | 0.56 | † | 0.11 | -0.11 | † | † | † | |
| 7 | R061607 | 0.75 | -0.02 | † | 0.91 | 0.47 | -1.38 | † | † | |
| 8 | R061608 | 1.27 | 1.35 | † | † | † | † | † | † | |
| 9 | R061609 | 1.40 | 1.02 | .22 | † | † | † | † | † | |
| R6 | 1 | R078901 | 0.97 | 0.61 | .18 | † | † | † | † | † |
| 2 | R078902 | 0.83 | -1.30 | .24 | † | † | † | † | † | |
| 3 | R078903 | 0.58 | -0.26 | † | 0.31 | -0.31 | † | † | † | |
| 4 | R078904 | 1.15 | 1.01 | .25 | † | † | † | † | † | |
| 5 | R078905 | 0.57 | 0.56 | † | 1.20 | -0.91 | -0.30 | † | † | |
| 6 | R078906 | 1.11 | 0.17 | .20 | † | † | † | † | † | |
| 7 | R078907 | 0.78 | 0.02 | † | † | † | † | † | † | |
| 8 | R078908 | 0.24 | -0.27 | .22 | † | † | † | † | † | |
| 9 | R078909 | 1.35 | -0.13 | .25 | † | † | † | † | † | |
| 10 | R078910 | 1.46 | -0.44 | .32 | † | † | † | † | † | |
Last updated 21 May 2017 (DC)
