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Table of Contents | Search Technical Documentation | References
NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Block-level Descriptive Statistics for Items as Defined After Scaling, Grade 8 Reading Combined National and State Assessment, by Block: 2013
| Statistic | Item type | Block R1 | Block R2 | Block R3 | Block R4 | Block R5 | Block R6 | Block R7 | Block R8 | Block R9 | Block R10 | Block R11 | Block R12 | Block R13 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
† Not applicable. 11 The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item/100). 22 Blocks R1, R3, R6, R10, R11, and R12 have larger sample sizes due to their pairing with integrated pilot blocks. NOTE: The "weighted average item score" of polytomous items are standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. Item statistics in this table are described on the page Blocks of Items. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2013 Reading Assessment. | ||||||||||||||
| Number of scaled items | Total | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 10 | 10 |
| Multiple choice | 5 | 6 | 7 | 6 | 7 | 7 | 7 | 6 | 5 | 5 | 7 | 5 | 6 | |
| Dichotomously scored constructed response | 1 | 0 | 2 | 2 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 2 | 1 | |
| Polytomously scored constructed response | 4 | 4 | 1 | 2 | 2 | 3 | 2 | 3 | 5 | 5 | 4 | 3 | 3 | |
| Unweighted sample size2 | † | 25,700 | 23,700 | 25,800 | 23,800 | 23,900 | 25,900 | 23,700 | 23,700 | 23,700 | 25,100 | 25,100 | 25,800 | 23,600 |
| Weighted average item score | † | .66 | .66 | .62 | .58 | .75 | .75 | .77 | .71 | .69 | .63 | .69 | .66 | .64 |
| Weighted average polyserial | † | .64 | .66 | .63 | .64 | .71 | .74 | .72 | .63 | .67 | .66 | .66 | .65 | .69 |
| Weighted alpha reliability | † | .71 | .72 | .67 | .68 | .71 | .73 | .65 | .61 | .71 | .71 | .75 | .70 | .72 |
| Weighted proportion of students attempting last item1 | † | .84 | .92 | .96 | .97 | .96 | .96 | .94 | .94 | .94 | .94 | .92 | .80 | .94 |
Last updated 21 May 2017 (DC)