Statistic | Type of school1 | 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 Nonpublic school sample includes only private and Catholic schools. NOTE: The "weighted average item score" of polytomous items are standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. The "weighted proportion of students attempting last item" is equal to 1- (percent not responding to last item /100). 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), 2011 Reading Assessment. |
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Number of scaled items | † | 11 | 8 | 11 | 10 | 10 | 10 | 10 | 10 | 9 | 10 |
Unweighted sample size | Public | 38,700 | 38,700 | 38,600 | 38,500 | 38,400 | 38,600 | 38,500 | 38,700 | 38,500 | 38,500 |
Nonpublic | 1,200 | 1,200 | 1,200 | 1,100 | 1,200 | 1,200 | 1,200 | 1,200 | 1,100 | 1,200 | |
Weighted average item score | Public | .61 | .64 | .63 | .61 | .49 | .51 | .56 | .51 | .58 | .50 |
Nonpublic | .68 | .70 | .68 | .69 | .57 | .58 | .65 | .57 | .68 | .55 | |
Weighted average polyserial | Public | .64 | .68 | .62 | .62 | .62 | .65 | .61 | .63 | .69 | .60 |
Nonpublic | .63 | .65 | .62 | .61 | .60 | .66 | .62 | .61 | .68 | .60 | |
Weighted alpha reliability | Public | .74 | .68 | .71 | .74 | .71 | .74 | .71 | .70 | .72 | .71 |
Nonpublic | .68 | .58 | .65 | .67 | .67 | .72 | .66 | .64 | .69 | .67 | |
Weighted proportion of students attempting last item | Public | .81 | .80 | .78 | .77 | .75 | .78 | .77 | .74 | .85 | .70 |
Nonpublic | .93 | .90 | .88 | .87 | .86 | .87 | .88 | .87 | .93 | .84 |