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Table of Contents | Search Technical Documentation | References
NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 12 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. 1 1 The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item/100). 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 | 9 | 10 | 11 | 10 | 9 | 10 | 10 | 11 | 11 |
| Multiple choice | 5 | 6 | 7 | 6 | 4 | 7 | 7 | 6 | 5 | 6 | 6 | 7 | 6 | |
| Dichotomously scored constructed response | 1 | 0 | 2 | 2 | 1 | 1 | 2 | 0 | 0 | 1 | 0 | 0 | 1 | |
| Polytomously scored constructed response | 4 | 4 | 1 | 2 | 4 | 2 | 2 | 4 | 4 | 3 | 4 | 4 | 4 | |
| Unweighted sample size | † | 6,600 | 6,500 | 6,600 | 6,500 | 6,600 | 6,600 | 6,600 | 6,500 | 6,600 | 6,500 | 6,500 | 6,600 | 6,600 |
| Weighted average item score | † | .72 | .73 | .74 | .68 | .58 | .59 | .65 | .67 | .60 | .60 | .56 | .68 | .56 |
| Weighted average polyserial | † | .67 | .71 | .69 | .70 | .72 | .63 | .67 | .73 | .67 | .66 | .63 | .72 | .63 |
| Weighted alpha reliability | † | .70 | .72 | .68 | .70 | .72 | .68 | .72 | .75 | .73 | .73 | .69 | .77 | .70 |
| Weighted proportion of students attempting last item1 | † | .91 | .95 | .99 | .99 | .96 | .97 | .97 | .87 | .95 | .91 | .95 | .97 | .89 |
Last updated 21 May 2017 (DC)