Age | Statistic | Multiple-choice items | Dichotomous constructed-response items | Polytomous constructed-response items |
---|---|---|---|---|
† Not applicable. 1 Missing responses includes the categories "omitted" and "not-reached." 2 An "off-task" response (constructed-response items only) is a response that is unrelated to the question and is considered inappropriate. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2008 Reading Long-term Trend Assessment. |
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9 | Number of items | 84.00 | † | 4.00 |
Average percent missing1 | 2.87 | † | 6.15 | |
Minimum | 0.37 | † | 3.70 | |
Maximum | 14.41 | † | 9.71 | |
Average percent off-task2 | † | † | 1.17 | |
Minimum | † | † | 0.72 | |
Maximum | † | † | 1.60 | |
Average weighted proportion correct | 65.40 | † | 36.21 | |
13 | Number of items | 100.00 | † | 7.00 |
Average percent missing1 | 2.42 | † | 3.53 | |
Minimum | 0.09 | † | 1.90 | |
Maximum | 11.62 | † | 5.52 | |
Average percent off-task2 | † | † | 0.29 | |
Minimum | † | † | 0.09 | |
Maximum | † | † | 0.50 | |
Average weighted proportion correct | 75.48 | † | 53.55 | |
17 | Number of items | 96.00 | † | 8.00 |
Average percent missing1 | 2.19 | † | 6.08 | |
Minimum | 0.32 | † | 3.34 | |
Maximum | 14.62 | † | 13.32 | |
Average percent off-task2 | † | † | 0.60 | |
Minimum | † | † | 0.14 | |
Maximum | † | † | 1.09 | |
Average weighted proportion correct | 78.26 | † | 56.10 |