Table of Contents | Search Technical Documentation | References
Statistic | Item type | Block R21 | Block R22 | Block R23 | Block R24 | Block R25 | Block R26 | Block R27 | Block R28 | Block R29 | Block R30 |
---|---|---|---|---|---|---|---|---|---|---|---|
Number of scaled items | Total | 10 | 10 | 10 | 10 | 10 | 9 | 11 | 11 | 11 | 11 |
Multiple choice | 9 | 9 | 9 | 9 | 9 | 8 | 11 | 10 | 10 | 11 | |
Dichotomously scored constructed response | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Polytomously scored constructed response | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | |
Unweighted sample size | † | 2,500 | 2,400 | 2,500 | 2,500 | 2,500 | 2,500 | 2,400 | 2,500 | 2,500 | 2,500 |
Weighted average item score |
† |
0.78 | 0.71 | 0.80 | 0.80 | 0.80 | 0.69 | 0.79 | 0.76 | 0.75 | 0.74 |
Weighted average polyserial | † | 0.72 | 0.67 | 0.80 | 0.83 | 0.82 | 0.70 | 0.75 | 0.72 | 0.75 | 0.71 |
Weighted alpha reliability | † | 0.58 | 0.66 | 0.66 | 0.68 | 0.74 | 0.65 | 0.66 | 0.74 | 0.75 | 0.72 |
Weighted proportion of students attempting last item1 | † | 0.96 | 0.93 | 0.98 | 0.99 | 0.98 | 0.96 | 0.99 | 0.88 | 0.93 | 0.97 |
† 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 Long-Term Trend Reading Assessment. |