Statistic | Item type | Block R1 | Block R2 | Block R3 | Block R4 | Block R5 | Block R6 | Block R7 | Block R8 | Block R9 | Block R10 |
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† 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), 2012 Reading Long-Term Trend Assessment. |
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Number of scaled items | Total | 10 | 9 | 11 | 11 | 10 | 14 | 11 | 9 | 10 | 10 |
Multiple choice | 9 | 8 | 10 | 10 | 9 | 14 | 11 | 8 | 9 | 10 | |
Dichtomously scored constructed response | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Polytomously scored constructed response | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | |
Unweighted sample size | † | 2,467 | 2,455 | 2,455 | 2,445 | 2,492 | 2,462 | 2,400 | 2,511 | 2,435 | 2,482 |
Weighted average item score | † | 0.71 | 0.76 | 0.80 | 0.70 | 0.69 | 0.78 | 0.78 | 0.74 | 0.78 | 0.79 |
Weighted average polyserial | † | 0.71 | 0.76 | 0.74 | 0.65 | 0.76 | 0.70 | 0.71 | 0.68 | 0.74 | 0.73 |
Weighted alpha reliability | † | 0.68 | 0.68 | 0.69 | 0.71 | 0.79 | 0.75 | 0.66 | 0.62 | 0.66 | 0.68 |
Weighted proportion of students attempting last item1 | † | 0.89 | 0.94 | 0.92 | 0.89 | 0.93 | 0.93 | 0.96 | 0.87 | 0.90 | 0.95 |