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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 4 Reading National Main Assessment (Accommodations Permitted [R3]: 2000
| Statistic | Item type | Block R3 | Block R4 | Block R5 | Block R6 | Block R7 | Block R8 | Block R9 | Block R10 |
|---|---|---|---|---|---|---|---|---|---|
| Number of scaled items | Total | 9 | 12 | 11 | 9 | 10 | 9 | 9 | 12 |
| Multiple choice | 3 | 5 | 7 | 4 | 4 | 3 | 3 | 6 | |
| Dichotomously scored constructed response | 3 | 6 | 3 | 2 | 5 | 1 | 1 | 5 | |
| Polytomously scored constructed response | 3 | 1 | 1 | 3 | 1 | 5 | 5 | 1 | |
| Unweighted sample size | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | |
| Weighted average item score | 0.48 | 0.63 | 0.44 | 0.60 | 0.43 | 0.52 | 0.60 | 0.65 | |
| Weighted average polyserial | 0.66 | 0.69 | 0.64 | 0.73 | 0.68 | 0.65 | 0.66 | 0.67 | |
| Weighted alpha reliability | 0.71 | 0.80 | 0.75 | 0.79 | 0.72 | 0.74 | 0.78 | 0.78 | |
| Weighted proportion of students attempting last item1 | 75.09 | 67.93 | 76.00 | 71.42 | 64.64 | 74.28 | 72.56 | 84.69 | |
| 1 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), 2000. |
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Last updated 11 July 2008 (DB)
