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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 4 Mathematics Combined National and State Assessment, by Block: 2013
| Statistic | Item type | Block M3 | Block M4 | Block M5 | Block M6 | Block M7 | Block M8 | Block M9 | Block M10 | Block M11 | Block M12 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| † Not applicable. 1 The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item /100). 2 Blocks M4, M5, M8, M9, M10, and M11 have larger sample sizes due to their pairing with integrated pilot blocks.Sample sizes across administered blocks varied due to the integrated pilot design, as well as the increased use of some blocks for various accommodations. 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 Mathematics Assessment. | |||||||||||
| Number of scaled items | Total | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 16 | 13 |
| Multiple choice | 10 | 11 | 10 | 12 | 9 | 11 | 10 | 11 | 10 | 10 | |
| Dichotomously scored constructed response | 1 | 1 | 3 | 1 | 2 | 3 | 2 | 0 | 0 | 0 | |
| Polytomously scored constructed response | 4 | 3 | 2 | 2 | 4 | 1 | 3 | 4 | 6 | 3 | |
| Unweighted sample size2 | † | 34,800 | 36,300 | 36,500 | 35,200 | 37,100 | 38,800 | 36,400 | 36,900 | 36,700 | 35,200 |
| Weighted average item score | † | .52 | .53 | .64 | .58 | .51 | .61 | .57 | .57 | .56 | .61 |
| Weighted average polyserial | † | .63 | .60 | .63 | .61 | .60 | .63 | .62 | .58 | .54 | .64 |
| Weighted alpha reliability | † | .77 | .74 | .78 | .76 | .77 | .76 | .75 | .70 | .70 | .75 |
| Weighted proportion of students attempting last item1 | † | .96 | .90 | .90 | .94 | .90 | .89 | .93 | .97 | .94 | .97 |
Last updated 21 May 2017 (DC)