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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 8 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 | 0.41 | 0.21 | .10 | † | † | † | † | † |
| 2 | R059602 | 0.57 | -0.31 | .25 | † | † | † | † | † | |
| 3 | R059603 | 0.93 | -0.60 | .19 | † | † | † | † | † | |
| 4 | R059604 | 0.69 | -1.58 | † | † | † | † | † | † | |
| 5 | R059610 | 0.39 | -0.12 | † | 0.59 | -1.16 | 0.57 | † | † | |
| 6 | R059606 | 0.65 | -0.66 | † | 0.32 | -0.32 | † | † | † | |
| 7 | R059605 | 0.67 | 0.80 | † | 0.84 | -0.84 | † | † | † | |
| 8 | R059608 | 0.78 | -0.08 | .35 | † | † | † | † | † | |
| 9 | R059609 | 0.80 | -1.65 | .24 | † | † | † | † | † | |
| 10 | R059607 | 0.47 | -0.76 | † | 0.08 | -0.08 | † | † | † | |
| R2 | 1 | R069801 | 0.41 | -0.73 | † | 2.73 | -2.73 | † | † | † |
| 2 | R069802 | 0.72 | -0.16 | .16 | † | † | † | † | † | |
| 3 | R069803 | 1.53 | -0.66 | .39 | † | † | † | † | † | |
| 4 | R069804 | 0.83 | -0.11 | † | 1.00 | -1.00 | † | † | † | |
| 5 | R069805 | 0.88 | 0.34 | .39 | † | † | † | † | † | |
| 6 | R069806 | 0.61 | -0.11 | † | 1.53 | 0.37 | -1.90 | † | † | |
| 7 | R069807 | 1.06 | -0.53 | .26 | † | † | † | † | † | |
| 8 | R069808 | 0.70 | -1.28 | .22 | † | † | † | † | † | |
| 9 | R069809 | 0.95 | -0.76 | .28 | † | † | † | † | † | |
| 10 | R069810 | 0.48 | 0.18 | † | 0.14 | -0.14 | † | † | † | |
| R5 | 1 | R058501 | 0.95 | -1.40 | .18 | † | † | † | † | † |
| 2 | R058502 | 1.16 | -0.69 | .27 | † | † | † | † | † | |
| 3 | R058503 | 0.61 | -1.46 | .14 | † | † | † | † | † | |
| 4 | R058504 | 0.50 | -1.07 | † | 1.39 | -1.39 | † | † | † | |
| 5 | R058505 | 0.86 | -0.29 | .20 | † | † | † | † | † | |
| 6 | R058506 | 0.99 | -0.89 | .24 | † | † | † | † | † | |
| 7 | R058507 | 0.65 | -1.30 | .13 | † | † | † | † | † | |
| 8 | R058508 | 0.50 | -0.97 | † | 0.33 | 0.62 | -0.95 | † | † | |
| 9 | R058509 | 0.45 | -0.52 | † | † | † | † | † | † | |
| 10 | R058510 | 0.82 | -1.26 | .22 | † | † | † | † | † | |
| R6 | 1 | R058601 | 1.02 | -1.22 | .17 | † | † | † | † | † |
| 2 | R058602 | 0.46 | -0.58 | † | 1.22 | -1.22 | † | † | † | |
| 3 | R058603 | 1.20 | -1.08 | .33 | † | † | † | † | † | |
| 4 | R058604 | 1.27 | -1.02 | .20 | † | † | † | † | † | |
| 5 | R058605 | 0.67 | -1.18 | .09 | † | † | † | † | † | |
| 6 | R058606 | 0.59 | -0.35 | † | 0.26 | -0.26 | † | † | † | |
| 7 | R058607 | 1.16 | -0.84 | .30 | † | † | † | † | † | |
| 8 | R058608 | 0.60 | -0.23 | † | 1.28 | -0.34 | -0.94 | † | † | |
| 9 | R058609 | 0.72 | -0.68 | .09 | † | † | † | † | † | |
| 10 | R058610 | 1.02 | -1.27 | .27 | † | † | † | † | † | |
| R9 | 1 | R060501 | 0.44 | -0.74 | .22 | † | † | † | † | † |
| 2 | R060502 | 1.35 | -1.79 | .27 | † | † | † | † | † | |
| 3 | R060503 | 0.65 | -0.39 | † | 0.49 | -0.49 | † | † | † | |
| 4 | R060504 | 0.98 | -0.82 | .24 | † | † | † | † | † | |
| 5 | R060505 | 0.58 | -0.69 | † | 1.12 | -0.74 | -0.38 | † | † | |
| 6 | R060507 | 0.52 | 0.00 | † | 1.67 | -1.67 | † | † | † | |
| 7 | R060508 | 0.68 | 0.81 | † | 1.19 | -1.19 | † | † | † | |
| 8 | R060509 | 0.54 | -0.49 | † | 0.16 | -0.16 | † | † | † | |
| 9 | R060510 | 0.69 | -1.41 | .37 | † | † | † | † | † | |
| 10 | R060511 | 0.74 | -1.09 | .34 | † | † | † | † | † | |
| R10 | 1 | R060601 | 0.86 | -0.33 | .20 | † | † | † | † | † |
| 2 | R060602 | 0.55 | -1.39 | .18 | † | † | † | † | † | |
| 3 | R060607 | 0.59 | -0.67 | † | 1.94 | -1.94 | † | † | † | |
| 4 | R060604 | 0.64 | -1.44 | .29 | † | † | † | † | † | |
| 5 | R060605 | 0.69 | -0.45 | † | 1.47 | -1.47 | † | † | † | |
| 6 | R060606 | 0.52 | 1.34 | † | 2.18 | -1.52 | -0.66 | † | † | |
| 7 | R060610 | 0.94 | -0.16 | .22 | † | † | † | † | † | |
| 8 | R060608 | 0.54 | -0.02 | † | 0.26 | -0.26 | † | † | † | |
| 9 | R060609 | 1.17 | -1.02 | .28 | † | † | † | † | † | |
| 10 | R060603 | 0.60 | 0.07 | † | 0.79 | -0.79 | † | † | † | |
Last updated 21 May 2017 (DC)
