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Statistic | Type of school1 | Block R1 | Block R2 | Block R3 | Block R4 | Block R5 | Block R6 | Block R7 | Block R8 | Block R9 | Block R10 | Block R11 | Block R12 | Block R13 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
† Not applicable. 1 Nonpublic school sample includes only private schools, including Catholic schools. 2 The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item/100). NOTES: Blocks R1, R3, R6, R10, R11, and R12 have larger sample sizes due to their pairing with integrated pilot blocks. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2013 Reading Assessment. | ||||||||||||||
Number of scaled items | † | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 10 | 10 |
Unweighted sample size | Public | 24,900 | 22,900 | 24,900 | 23,000 | 23,100 | 25,100 | 23,000 | 23,000 | 22,900 | 24,300 | 24,300 | 25,000 | 22,800 |
Nonpublic | 500 | 500 | 500 | 500 | 500 | 500 | 400 | 400 | 400 | 500 | 500 | 500 | 400 | |
Weighted average item score | Public | .65 | .66 | .61 | .57 | .75 | .74 | .77 | .71 | .68 | .62 | .69 | .66 | .63 |
Nonpublic | .74 | .74 | .69 | .66 | .83 | .84 | .81 | .78 | .75 | .73 | .77 | .74 | .74 | |
Weighted average polyserial | Public | .63 | .66 | .63 | .64 | .70 | .74 | .71 | .63 | .67 | .65 | .66 | .65 | .69 |
Nonpublic | .61 | .64 | .64 | .61 | .77 | .76 | .76 | .56 | .65 | .62 | .64 | .64 | .72 | |
Weighted alpha reliability | Public | .71 | .72 | .66 | .68 | .71 | .73 | .66 | .61 | .71 | .71 | .75 | .71 | .72 |
Nonpublic | .61 | .62 | .65 | .59 | .66 | .65 | .57 | .49 | .67 | .61 | .69 | .64 | .68 | |
Weighted proportion of students attempting last item2 | Public | .84 | .91 | .96 | .97 | .95 | .96 | .94 | .94 | .94 | .94 | .92 | .80 | .93 |
Nonpublic | .94 | .98 | .98 | .99 | .97 | .99 | .97 | .97 | .97 | .97 | .95 | .89 | .99 |