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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 4 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 | R068901 | 1.10 | -0.45 | .30 | † | † | † | † | † |
| 2 | R068902 | 1.55 | 1.19 | .29 | † | † | † | † | † | |
| 3 | R068903 | 0.99 | -0.16 | .25 | † | † | † | † | † | |
| 4 | R068904 | 0.64 | -0.24 | † | † | † | † | † | † | |
| 5 | R068905 | 1.27 | -0.86 | .35 | † | † | † | † | † | |
| 6 | R068906 | 0.99 | -1.35 | .19 | † | † | † | † | † | |
| 7 | R068907 | 0.56 | 0.71 | † | 1.91 | 0.24 | -2.15 | † | † | |
| 8 | R068908 | 1.32 | -0.76 | .18 | † | † | † | † | † | |
| 9 | R068909 | 0.78 | -0.91 | .27 | † | † | † | † | † | |
| 10 | R068910 | 0.44 | -0.41 | † | 0.34 | -0.34 | † | † | † | |
| 11 | R068911 | 0.58 | -1.13 | .25 | † | † | † | † | † | |
| R2 | 1 | R057801 | 1.24 | -0.89 | .39 | † | † | † | † | † |
| 2 | R057802 | 1.20 | -0.14 | .28 | † | † | † | † | † | |
| 4 | R057804 | 0.97 | -0.62 | .25 | † | † | † | † | † | |
| 5 | R057805 | 0.63 | -0.27 | .23 | † | † | † | † | † | |
| 6 | R057806 | 0.54 | 0.25 | † | 2.01 | 0.16 | -2.17 | † | † | |
| 7 | R057807 | 0.79 | -1.11 | † | † | † | † | † | † | |
| 8 | R057808 | 0.85 | 0.70 | .23 | † | † | † | † | † | |
| 9 | R057809 | 0.60 | 0.42 | † | 1.51 | -1.51 | † | † | † | |
| R3 | 1 | R068701 | 1.04 | -0.21 | .28 | † | † | † | † | † |
| 2 | R068702 | 0.63 | -1.16 | .35 | † | † | † | † | † | |
| 3 | R068703 | 1.52 | -0.50 | .25 | † | † | † | † | † | |
| 4 | R068704 | 0.46 | -1.06 | † | 0.33 | -0.33 | † | † | † | |
| 5 | R068705 | 0.79 | -1.58 | .23 | † | † | † | † | † | |
| 6 | R068706 | 1.13 | -1.06 | .32 | † | † | † | † | † | |
| 7 | R068707 | 0.55 | 0.88 | † | 1.24 | 0.05 | -1.29 | † | † | |
| 8 | R068708 | 0.39 | -0.18 | † | -0.26 | 0.26 | † | † | † | |
| 9 | R068709 | 0.73 | 1.36 | .31 | † | † | † | † | † | |
| 10 | R068710 | 1.01 | 0.79 | .22 | † | † | † | † | † | |
| 11 | R068711 | 0.47 | 0.36 | † | -0.82 | 0.82 | † | † | † | |
| R5 | 1 | R058501 | 1.20 | 0.17 | .18 | † | † | † | † | † |
| 2 | R058502 | 1.35 | 0.53 | .25 | † | † | † | † | † | |
| 3 | R058503 | 1.10 | 0.57 | .25 | † | † | † | † | † | |
| 4 | R058504 | 0.55 | 0.20 | † | 1.38 | -1.38 | † | † | † | |
| 5 | R058505 | 1.47 | 0.82 | .17 | † | † | † | † | † | |
| 6 | R058506 | 0.98 | 0.22 | .26 | † | † | † | † | † | |
| 7 | R058507 | 1.00 | 0.45 | .21 | † | † | † | † | † | |
| 8 | R058508 | 0.55 | 0.41 | † | 0.53 | 0.63 | -1.16 | † | † | |
| 9 | R058509 | 0.73 | 0.78 | † | † | † | † | † | † | |
| 10 | R058510 | 0.99 | 0.27 | .27 | † | † | † | † | † | |
| R6 | 1 | R058601 | 1.08 | -0.05 | .16 | † | † | † | † | † |
| 2 | R058602 | 0.53 | 0.67 | † | 0.53 | -0.53 | † | † | † | |
| 3 | R058603 | 1.17 | -0.04 | .37 | † | † | † | † | † | |
| 4 | R058604 | 1.44 | 0.13 | .26 | † | † | † | † | † | |
| 5 | R058605 | 1.21 | 0.52 | .18 | † | † | † | † | † | |
| 6 | R058606 | 0.63 | 1.04 | † | 0.36 | -0.36 | † | † | † | |
| 7 | R058607 | 1.41 | 0.22 | .30 | † | † | † | † | † | |
| 8 | R058608 | 0.63 | 1.04 | † | 1.47 | -0.42 | -1.04 | † | † | |
| 9 | R058609 | 0.95 | 0.38 | .14 | † | † | † | † | † | |
| 10 | R058610 | 1.35 | 0.08 | .27 | † | † | † | † | † | |
Last updated 21 May 2017 (DC)