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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 4 Writing Combined National and State Main Assessment: 2002
| Statistic | Item type | All items |
|---|---|---|
| Number of scaled items | Total | 20 |
| Multiple choice | 0 | |
| Dichotomously scored constructed response | 0 | |
| Polytomously scored constructed response | 20 | |
| Unweighted sample size | † | 144,200 |
| Weighted average item score | † | 0.52 |
| Weighted average polyserial | † | 0.90 |
| Weighted alpha reliability | † | — |
| † Not applicable. — In NAEP writing assessments, each block contains only one item — a writing prompt to which students respond with a polytomously scored constructed response; therefore, the weighted alpha reliability estimate is not meaningful. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002 Writing Assessment. |
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Last updated 24 March 2009 (GF)