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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 8 Writing Combined National and State Main Assessment: 2007
| Statistic | Item type | All items |
|---|---|---|
| † Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007 Writing Assessment. |
||
| Number of scaled Items | Total | 20 |
| Multiple choice | 0 | |
| Dichotomously scored constructed response | 0 | |
| Polytomously scored constructed response | 20 | |
| Unweighted sample size | 139,900 | |
| Weighted average iem score | 0.55 | |
| Weighted average polyserial | 0.92 | |
| Weighted alpha reliability | † | |
| Weighted proportion of students attempting last item | † | |
Last updated 23 June 2010 (GF)