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Table of Contents | Search Technical Documentation | References
NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 12 Reading National Assessment, by Block and Item Type: 2015
NAEP Technical DocumentationOverall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 12 Reading National Assessment, by Block and Item Type: 2015
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of scaled items | Total | 10 | 10 | 10 | 10 | 9 | 10 | 11 | 10 | 9 | 10 | 11 | 11 | 11 |
| Multiple choice | 5 | 6 | 7 | 6 | 4 | 7 | 7 | 6 | 5 | 6 | 7 | 7 | 6 | |
| Dichotomously scored constructed-response | 1 | 0 | 2 | 1 | 1 | 1 | 2 | 0 | 0 | 1 | 1 | 0 | 2 | |
| Polytomously scored constructed-response | 4 | 4 | 1 | 3 | 4 | 2 | 2 | 4 | 4 | 3 | 3 | 4 | 3 | |
| Unweighted sample size | † | 2,400 | 2,400 | 2,400 | 2,400 | 2,400 | 2,400 | 2,500 | 2,500 | 2,400 | 2,400 | 2,400 | 2,500 | 2,400 |
| Weighted average item score1 | † | .71 | .73 | .71 | .60 | .57 | .60 | .64 | .63 | .58 | .61 | .57 | .67 | .57 |
| Weighted average polyserial | † | .70 | .71 | .70 | .69 | .73 | .66 | .71 | .76 | .69 | .68 | .71 | .73 | .66 |
| Weighted alpha reliability | † | .73 | .74 | .70 | .75 | .74 | .70 | .76 | .79 | .76 | .75 | .80 | .78 | .72 |
| Weighted proportion of students attempting last item2 | † | .90 | .94 | .99 | .85 | .96 | .98 | .97 | .87 | .94 | .92 | .97 | .96 | .89 |
| † Not applicable. 1 The "Weighted average item score" of polytomous items is standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. 2 The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100). NOTE: 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), 2015 Reading Assessment. | ||||||||||||||
Last updated 09 November 2021 (ML)