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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Age 17 Mathematics Long-Term Trend Assessment: 2004
| Statistic | Item type | Block M21 | Block M22 | Block M23 | Block M24 | Block MX51 | Block MX52 |
|---|---|---|---|---|---|---|---|
| Number of scaled items | Total | 23 | 22 | 35 | 35 | 23 | 22 |
| Multiple choice | 19 | 17 | 25 | 30 | 18 | 17 | |
| Dichotomously scored constructed response | 4 | 5 | 10 | 5 | 5 | 5 | |
| Polytomously scored constructed response | 0 | 0 | 0 | 0 | 0 | 0 | |
| Unweighted sample size | † | 3,800 | 3,800 | 3,800 | 3,700 | 3,800 | 3,700 |
| Weighted average item score | † | 0.67 | 0.69 | 0.66 | 0.69 | 0.65 | 0.68 |
| Weighted average polyserial | † | 0.72 | 0.65 | 0.67 | 0.63 | 0.69 | 0.67 |
| Weighted alpha reliability | † | 0.89 | 0.82 | 0.91 | 0.89 | 0.87 | 0.84 |
| Weighted proportion of students attempting last item1 | † | 0.93 | 0.97 | 0.87 | 0.74 | 0.93 | 0.98 |
| † Not applicable. 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), 2004 Mathematics Long-Term Trend Assessment. |
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Last updated 06 February 2009 (GF)