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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 Information Subscale, Grade 8 Reading 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. | ||||||||||
| R3 | 1 | R060101 | 0.48 | -1.17 | .20 | † | † | † | † | † |
| 2 | R060102 | 0.93 | -0.07 | .33 | † | † | † | † | † | |
| 3 | R060103 | 0.67 | -0.65 | † | † | † | † | † | † | |
| 4 | R060104 | 0.84 | -0.72 | .30 | † | † | † | † | † | |
| 5 | R060105 | 0.88 | -0.32 | † | † | † | † | † | † | |
| 6 | R060106 | 0.89 | -0.45 | .19 | † | † | † | † | † | |
| 7 | R060107 | 1.19 | 0.66 | .24 | † | † | † | † | † | |
| 8 | R060108 | 0.49 | 0.15 | † | 0.11 | 0.84 | -0.95 | † | † | |
| 9 | R060109 | 0.72 | 0.78 | .16 | † | † | † | † | † | |
| 10 | R060110 | 0.61 | 0.72 | .24 | † | † | † | † | † | |
| R4 | 1 | R060301 | 0.60 | -1.32 | † | † | † | † | † | † |
| 2 | R060302 | 0.80 | -0.56 | .23 | † | † | † | † | † | |
| 3 | R060304 | 0.96 | -0.01 | .57 | † | † | † | † | † | |
| 4 | R060305 | 0.78 | 1.10 | † | 1.76 | -1.76 | † | † | † | |
| 5 | R060303 | 1.20 | 0.36 | .18 | † | † | † | † | † | |
| 6 | R060306 | 0.60 | 0.97 | † | 1.31 | -1.31 | † | † | † | |
| 7 | R060307 | 0.71 | -0.05 | .20 | † | † | † | † | † | |
| 8 | R060308 | 0.85 | 0.66 | .23 | † | † | † | † | † | |
| 9 | R060309 | 0.52 | -0.02 | † | † | † | † | † | † | |
| 10 | R060310 | 1.23 | 0.15 | .25 | † | † | † | † | † | |
| R7 | 1 | R058801 | 1.46 | -1.30 | .31 | † | † | † | † | † |
| 2 | R058802 | 1.32 | -1.65 | .31 | † | † | † | † | † | |
| 3 | R058803 | 1.94 | -1.17 | .30 | † | † | † | † | † | |
| 4 | R058804 | 0.76 | -1.37 | .14 | † | † | † | † | † | |
| 5 | R058805 | 0.21 | 0.69 | † | † | † | † | † | † | |
| 6 | R058806 | 0.57 | -0.56 | .21 | † | † | † | † | † | |
| 7 | R058807 | 0.41 | -1.50 | † | 0.79 | 0.43 | -1.22 | † | † | |
| 8 | R058808 | 0.93 | -0.66 | .30 | † | † | † | † | † | |
| 9 | R058809 | 0.85 | -0.94 | .24 | † | † | † | † | † | |
| 10 | R058810 | 0.38 | -1.02 | † | 1.50 | -1.50 | † | † | † | |
| R8 | 1 | R059101 | 0.33 | -0.28 | .16 | † | † | † | † | † |
| 2 | R059102 | 0.69 | -2.37 | .10 | † | † | † | † | † | |
| 3 | R059103 | 0.75 | -0.92 | .11 | † | † | † | † | † | |
| 4 | R059104 | 1.04 | -2.21 | .13 | † | † | † | † | † | |
| 5 | R059109 | 0.44 | -0.25 | † | 0.74 | -0.74 | † | † | † | |
| 6 | R059106 | 0.42 | -0.20 | † | 1.97 | -0.82 | -1.15 | † | † | |
| 7 | R059105 | 0.83 | -0.62 | .25 | † | † | † | † | † | |
| 8 | R059107 | 0.44 | -1.89 | .06 | † | † | † | † | † | |
| 9 | R059108 | 0.36 | -0.26 | † | -0.24 | 0.24 | † | † | † | |
| 10 | R059110 | 0.47 | -1.23 | † | † | † | † | † | † | |
| R11 | 1 | R069602 | 1.19 | -0.39 | .27 | † | † | † | † | † |
| 2 | R069603 | 0.52 | -0.62 | † | 0.71 | -0.71 | † | † | † | |
| 3 | R069604 | 0.91 | -0.79 | 0.33 | † | † | † | † | † | |
| 4 | R069605 | 1.20 | -0.77 | 0.31 | † | † | † | † | † | |
| 5 | R069606 | 0.54 | -0.08 | † | 1.74 | -1.74 | † | † | † | |
| 6 | R069607 | 0.56 | -0.16 | † | 1.59 | -0.48 | -1.11 | † | † | |
| 7 | R069608 | 1.15 | -0.78 | 0.27 | † | † | † | † | † | |
| 8 | R069609 | 0.59 | -0.01 | † | 0.33 | -0.33 | † | † | † | |
| 9 | R069610 | 1.20 | -0.65 | 0.38 | † | † | † | † | † | |
| 10 | R069611 | 0.93 | -0.47 | 0.21 | † | † | † | † | † | |
| 11 | R069612 | 0.42 | -0.92 | 0.24 | † | † | † | † | † | |
| R12 | 1 | R061001 | 1.00 | -1.26 | 0.18 | † | † | † | † | † |
| 2 | R061002 | 0.92 | -0.41 | 0.34 | † | † | † | † | † | |
| 3 | R061003 | 0.72 | -0.39 | † | 0.65 | -0.65 | † | † | † | |
| 4 | R061004 | 0.75 | -1.78 | † | † | † | † | † | † | |
| 5 | R061005 | 0.36 | -1.08 | 0.09 | † | † | † | † | † | |
| 6 | R061006 | 0.73 | -0.22 | † | † | † | † | † | † | |
| 7 | R061007 | 0.43 | 0.25 | † | 1.64 | -2.01 | 0.37 | † | † | |
| 8 | R061008 | 1.09 | -0.02 | 0.25 | † | † | † | † | † | |
| 9 | R061009 | 1.14 | -0.98 | 0.26 | † | † | † | † | † | |
| 10 | R061010 | 0.36 | 1.03 | † | 1.57 | -1.57 | † | † | † | |
| R13 | 1 | R069701 | 1.17 | -0.17 | 0.20 | † | † | † | † | † |
| 2 | R069702 | 1.23 | 0.27 | 0.38 | † | † | † | † | † | |
| 3 | R069703 | 0.53 | -0.09 | 0.26 | † | † | † | † | † | |
| 4 | R069704 | 1.73 | -1.28 | 0.46 | † | † | † | † | † | |
| 5 | R069705 | 0.94 | -0.79 | † | † | † | † | † | † | |
| 6 | R069706 | 1.01 | -0.59 | † | 0.96 | -0.96 | † | † | † | |
| 7 | R069707 | 0.50 | 1.28 | † | 0.54 | -0.35 | -0.18 | † | † | |
| 8 | R069708 | 0.58 | 0.18 | † | 0.57 | -0.57 | † | † | † | |
| 9 | R069709 | 1.27 | -0.99 | 0.31 | † | † | † | † | † | |
| 10 | R069710 | 1.01 | 0.45 | 0.21 | † | † | † | † | † | |
Last updated 21 May 2017 (DC)