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: 2019
NAEP Technical DocumentationOverall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 12 Reading National Assessment, by Block: 2019
| Statistic | 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 | Block R15 | Block R16 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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. | |||||||||||||||
| The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100). Weights are applied to reflect sampling design. | |||||||||||||||
| DBA = Digitally based assessment. CR = Constructed response. Item statistics in this table are described on the page Blocks of Items. | |||||||||||||||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Reading Assessment. | |||||||||||||||
| Total number of scaled items | 9 | 10 | 10 | 10 | 9 | 10 | 11 | 10 | 9 | 10 | 11 | 11 | 10 | 9 | 8 |
| Number of multiple-choice items | 4 | 6 | 7 | 6 | 4 | 7 | 7 | 6 | 5 | 6 | 7 | 4 | 6 | 5 | 2 |
| Number of dichotomously scored CR items | 1 | 1 | 2 | 1 | 1 | 1 | 2 | 0 | 0 | 1 | 2 | 1 | 1 | 1 | 0 |
| Number of polytomously scored CR items | 4 | 3 | 1 | 3 | 4 | 2 | 2 | 4 | 4 | 3 | 2 | 6 | 3 | 3 | 6 |
| Unweighted sample size | 1,800 | 1,800 | 1,800 | 1,800 | 1,800 | 1,800 | 1,800 | 1,800 | 1,900 | 1,900 | 1,800 | 1,800 | 1,800 | 1,800 | 1,900 |
| Weighted average item score | .67 | .72 | .70 | .60 | .55 | .54 | .64 | .63 | .58 | .57 | .55 | .60 | .60 | .39 | .54 |
| Weighted average R biserial/polyserial | .75 | .76 | .78 | .72 | .76 | .65 | .73 | .76 | .71 | .71 | .72 | .74 | .69 | .65 | .71 |
| Weighted alpha reliability | .78 | .77 | .77 | .77 | .77 | .70 | .78 | .80 | .77 | .78 | .81 | .82 | .74 | .70 | .82 |
| Weighted proportion of students attempting last item | .92 | .95 | .99 | .86 | .99 | .99 | .98 | .89 | .98 | .92 | .98 | .97 | .98 | .94 | .85 |
| Statistic | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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. | |||||||||||||
| The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100). Weights are applied to reflect sampling design. | |||||||||||||
| PBA = Paper-based assessment. CR = Constructed response. Item statistics in this table are described on the page Blocks of Items. | |||||||||||||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Reading Assessment. | |||||||||||||
| Total number of scaled items | 10 | 10 | 10 | 10 | 9 | 10 | 11 | 10 | 9 | 10 | 11 | 11 | 11 |
| Number of multiple-choice items | 5 | 6 | 7 | 6 | 4 | 7 | 7 | 6 | 5 | 6 | 7 | 7 | 6 |
| Number of dichotomously scored CR items | 1 | 1 | 2 | 1 | 1 | 1 | 2 | 0 | 0 | 1 | 2 | 0 | 1 |
| Number of polytomously scored CR items | 4 | 3 | 1 | 3 | 4 | 2 | 2 | 4 | 4 | 3 | 2 | 4 | 4 |
| Unweighted sample size | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 1,900 | 2,000 | 2,000 | 1,900 | 2,000 | 2,000 | 2,000 | 1,900 |
| Weighted average item score | .70 | .74 | .72 | .62 | .56 | .57 | .64 | .65 | .57 | .59 | .58 | .67 | .55 |
| Weighted average R biserial/polyserial | .71 | .74 | .70 | .71 | .75 | .67 | .71 | .76 | .67 | .68 | .73 | .73 | .67 |
| Weighted alpha reliability | .75 | .76 | .70 | .76 | .76 | .72 | .76 | .78 | .75 | .76 | .81 | .78 | .74 |
| Weighted proportion of students attempting last item | .89 | .93 | .98 | .84 | .96 | .97 | .95 | .86 | .93 | .89 | .97 | .96 | .89 |
Last updated 05 October 2023 (SK)