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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 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. | ||||||||||
| R4 | 1 | R070201 | 0.64 | 0.63 | .28 | † | † | † | † | † |
| 2 | R070202 | 1.28 | 0.72 | .09 | † | † | † | † | † | |
| 3 | R070203 | 0.98 | -0.60 | .21 | † | † | † | † | † | |
| 4 | R070204 | 0.65 | 0.70 | † | 1.71 | -1.71 | † | † | † | |
| 5 | R070205 | 1.40 | -0.97 | .31 | † | † | † | † | † | |
| 6 | R070206 | 0.88 | 0.43 | † | 1.22 | -0.98 | -0.23 | † | † | |
| 7 | R070207 | 1.42 | -0.63 | .23 | † | † | † | † | † | |
| 8 | R070208 | 1.15 | -0.06 | .25 | † | † | † | † | † | |
| 9 | R070209 | 1.52 | 0.18 | .25 | † | † | † | † | † | |
| 10 | R070210 | 0.60 | 0.62 | † | 0.89 | -0.89 | † | † | † | |
| R7 | 1 | R058801 | 1.67 | -0.07 | .43 | † | † | † | † | † |
| 2 | R058802 | 1.15 | -0.37 | .29 | † | † | † | † | † | |
| 3 | R058803 | 2.31 | 0.03 | .28 | † | † | † | † | † | |
| 4 | R058804 | 1.31 | 0.05 | .23 | † | † | † | † | † | |
| 5 | R058805 | 0.37 | -0.22 | † | 1.18 | -1.18 | † | † | † | |
| 6 | R058806 | 0.84 | 0.82 | .23 | † | † | † | † | † | |
| 7 | R058807 | 0.44 | 0.12 | † | 0.93 | 0.39 | -1.33 | † | † | |
| 8 | R058808 | 1.56 | 0.75 | .27 | † | † | † | † | † | |
| 9 | R058809 | 1.11 | 0.30 | .27 | † | † | † | † | † | |
| 10 | R058810 | 0.50 | 0.65 | † | 0.94 | -0.94 | † | † | † | |
| R8 | 1 | R059101 | 0.56 | -0.14 | .18 | † | † | † | † | † |
| 2 | R059102 | 0.94 | -0.68 | .18 | † | † | † | † | † | |
| 3 | R059103 | 1.00 | 0.61 | .13 | † | † | † | † | † | |
| 4 | R059104 | 1.72 | -0.59 | .27 | † | † | † | † | † | |
| 5 | R059109 | 0.53 | 0.90 | † | 0.67 | -0.67 | † | † | † | |
| 6 | R059106 | 0.49 | 1.29 | † | 1.77 | -1.05 | -0.73 | † | † | |
| 7 | R059105 | 1.17 | 0.42 | .25 | † | † | † | † | † | |
| 8 | R059107 | 0.76 | -0.10 | .14 | † | † | † | † | † | |
| 9 | R059108 | 0.47 | 0.96 | † | -0.32 | 0.32 | † | † | † | |
| 10 | R059110 | 0.67 | 0.20 | † | † | † | † | † | † | |
| R9 | 1 | R058301 | 0.57 | -0.60 | .33 | † | † | † | † | † |
| 2 | R058302 | 1.11 | -0.38 | † | † | † | † | † | † | |
| 3 | R058303 | 1.57 | 0.19 | .23 | † | † | † | † | † | |
| 4 | R058304 | 0.54 | -0.48 | † | 0.52 | -0.52 | † | † | † | |
| 5 | R058311 | 1.87 | -0.07 | .35 | † | † | † | † | † | |
| 6 | R058306 | 1.87 | 0.87 | .33 | † | † | † | † | † | |
| 7 | R058307 | 0.67 | 0.39 | † | 0.67 | -0.70 | 0.03 | † | † | |
| 8 | R058308 | 1.84 | 0.35 | .21 | † | † | † | † | † | |
| 9 | R058309 | 1.68 | 0.12 | .18 | † | † | † | † | † | |
| R10 | 1 | R069301 | 0.91 | 0.13 | .22 | † | † | † | † | † |
| 2 | R069302 | 1.05 | -0.55 | .38 | † | † | † | † | † | |
| 3 | R069303 | 0.57 | 0.26 | .30 | † | † | † | † | † | |
| 4 | R069304 | 0.81 | -0.77 | .52 | † | † | † | † | † | |
| 5 | R069305 | 0.85 | 0.73 | † | † | † | † | † | † | |
| 6 | R069307 | 2.02 | 1.13 | .21 | † | † | † | † | † | |
| 7 | R069308 | 0.58 | 0.96 | † | 1.06 | 0.32 | -1.37 | † | † | |
| 8 | R069309 | 1.04 | 0.26 | .30 | † | † | † | † | † | |
Last updated 21 May 2017 (DC)