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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 Informational Subscale, Grade 4 Reading Combined National and State Assessment, by Block and Item: 2019
NAEP Technical DocumentationIRT Parameters for Items in the Informational Subscale, Grade 4 Reading Combined National and State Assessment, by Block and Item: 2019
| Item | NAEP ID | a | b | c | d | d | d | |
|---|---|---|---|---|---|---|---|---|
| Not applicable; c parameters are not estimated for the two-parameter logistic or generalized partial credit models, and d parameters are not estimated for the two-parameter or three-parameter logistic models. | ||||||||
| For item j, a represents the discriminatory power of the item, b represents a location parameter related to item difficulty, c represents the guessing parameter, and d 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, d may not sum to zero because of rounding. | ||||||||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Reading Assessment. | ||||||||
| Block R4 | ||||||||
| 1 | R070201 | 0.69 | 0.55 | 0.25 | ||||
| 2 | R070202 | 1.30 | 0.61 | 0.17 | ||||
| 3 | R070203 | 1.06 | -0.45 | 0.27 | ||||
| 4 | R070204 | 0.68 | 1.46 | 1.31 | -1.31 | |||
| 5 | R070205 | 1.59 | -0.69 | 0.27 | ||||
| 6 | R070206 | 1.00 | 0.80 | 1.25 | -0.89 | -0.36 | ||
| 7 | R070207 | 1.81 | -0.14 | 0.29 | ||||
| 8 | R070208 | 1.40 | 0.26 | 0.25 | ||||
| 9 | R070209 | 1.53 | 0.21 | 0.17 | ||||
| 10 | R070210 | 0.55 | 0.78 | 0.00 | 0.00 | |||
| Block R7 | ||||||||
| 1 | R058801 | 1.70 | 0.22 | 0.53 | ||||
| 2 | R058802 | 1.53 | -0.09 | 0.26 | ||||
| 3 | R058803 | 3.00 | 0.30 | 0.25 | ||||
| 4 | R058804 | 1.77 | 0.32 | 0.26 | ||||
| 5 | R058805 | 0.76 | -0.82 | |||||
| 6 | R058806 | 1.21 | 1.10 | 0.26 | ||||
| 7 | R058807 | 0.54 | 0.51 | 0.67 | 0.71 | -1.38 | ||
| 8 | R058808 | 1.65 | 0.61 | 0.32 | ||||
| 9 | R058809 | 1.40 | 0.66 | 0.30 | ||||
| 10 | R058810 | 0.65 | 0.74 | 0.69 | -0.69 | |||
| Block R8 | ||||||||
| 1 | R079701 | 1.76 | 0.21 | 0.11 | ||||
| 2 | R079702 | 1.58 | 0.09 | 0.30 | ||||
| 3 | R079703 | 0.54 | 0.24 | 1.04 | -1.04 | |||
| 4 | R079704 | 1.09 | 0.16 | 0.26 | ||||
| 5 | R079705 | 1.53 | 0.19 | 0.32 | ||||
| 6 | R079706 | 0.79 | 0.80 | -0.36 | 0.36 | |||
| 7 | R079707 | 1.08 | 0.72 | 0.70 | -0.08 | -0.62 | ||
| 8 | R079708 | 1.38 | 0.76 | 0.33 | ||||
| 9 | R079709 | 1.08 | 1.43 | 0.85 | -0.85 | |||
| 10 | R079710 | 1.50 | 0.41 | 0.17 | ||||
| Block R9 | ||||||||
| 1 | R088301 | 1.03 | 0.25 | 0.20 | ||||
| 2 | R088302 | 0.73 | 0.40 | 0.88 | -0.88 | |||
| 3 | R088303 | 1.22 | 0.27 | 0.29 | ||||
| 4 | R088304 | 1.04 | 0.07 | 0.27 | ||||
| 5 | R088306 | 1.11 | 0.63 | 0.31 | ||||
| 6 | R088307 | 1.35 | 0.82 | 0.26 | ||||
| 7 | R088308 | 0.94 | 0.52 | |||||
| 8 | R088309 | 0.53 | 0.76 | 0.89 | -0.06 | -0.84 | ||
| 9 | R088310 | 0.71 | 0.59 | 1.08 | -1.08 | |||
| Block R10 | ||||||||
| 1 | R082301 | 1.01 | 0.75 | 0.23 | ||||
| 2 | R082302 | 1.18 | -0.88 | 0.37 | ||||
| 3 | R082303 | 1.52 | 0.53 | 0.21 | ||||
| 4 | R082304 | 0.77 | 0.36 | 0.33 | ||||
| 5 | R082305 | 0.81 | 0.22 | 0.66 | -0.66 | |||
| 6 | R082307 | 0.34 | 0.94 | 1.03 | -0.93 | -0.11 | ||
| 7 | R082308 | 1.18 | 0.30 | 0.21 | ||||
| 8 | R082309 | 0.64 | 0.59 | 1.39 | -1.39 | |||
| 9 | R082310 | 1.09 | 0.60 | 0.30 | ||||
| 10 | R082311 | 0.61 | 0.20 | |||||
| Block R14 | ||||||||
| 1 | R0879M2 | 1.06 | 1.01 | |||||
| 2 | R087903 | 1.00 | 0.38 | 0.19 | ||||
| 3 | R087904 | 0.40 | 0.56 | -1.68 | 1.68 | |||
| 4 | R087906 | 0.42 | 0.10 | 0.50 | -0.50 | |||
| 5 | R087907 | 2.03 | 0.84 | 0.32 | ||||
| 6 | R0879M8 | 0.78 | -0.18 | |||||
| 7 | R087909 | 0.89 | -0.03 | |||||
| 8 | R087912 | 1.34 | 0.60 | 0.35 | ||||
| 9 | R087913 | 0.48 | 0.63 | 0.16 | -0.16 | |||
Last updated 05 December 2023 (SK)