Table of Contents | Search Technical Documentation | References
NAEP Analysis and Scaling → Initial Activities → Summaries of Item-Level Response Rates for NAEP Assessments → Summary Item Response Rates, Science National Assessment, by Item Type and Grade: 2019
NAEP Technical DocumentationSummary Item Response Rates, Science National Assessment, by Item Type and Grade: 2019
| Statistic | Multiple-choice items | Dichotomous constructed-response items | Polytomous constructed-response items |
|---|---|---|---|
| Not applicable. | |||
| Rounds to zero. | |||
| Missing responses include the categories "omitted" and "not-reached." | |||
| An "off-task" response (constructed-response items only) is a response that is unrelated to the question. | |||
| DBA = Digitally based assessment. | |||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment. | |||
| Grade 4 | |||
| Number of items | 111 | 13 | 62 |
| Average percent missing | 7.02 | 4.57 | 6.52 |
| Minimum | 0.11 | 0.24 | 0.11 |
| Maximum | 31.98 | 15.38 | 28.43 |
| Average percent off-task | 0.18 | 0.20 | |
| Minimum | |||
| Maximum | 0.69 | 0.82 | |
| Average weighted percent correct | 58.53 | 50.62 | 41.57 |
| Grade 8 | |||
| Number of items | 134 | 9 | 69 |
| Average percent missing | 2.78 | 2.21 | 4.75 |
| Minimum | 0.06 | 0.79 | 0.08 |
| Maximum | 17.94 | 5.17 | 27.35 |
| Average percent off-task | 0.29 | 0.71 | |
| Minimum | |||
| Maximum | 1.71 | 5.72 | |
| Average weighted percent correct | 56.99 | 57.45 | 40.20 |
| Grade 12 | |||
| Number of items | 153 | 14 | 85 |
| Average percent missing | 1.71 | 3.15 | 4.25 |
| Minimum | 0.08 | 0.15 | 0.15 |
| Maximum | 14.45 | 28.94 | 14.57 |
| Average percent off-task | 1.30 | ||
| Minimum | |||
| Maximum | 7.04 | ||
| Average weighted percent correct | 50.92 | 45.78 | 33.34 |
| Statistic | Multiple-choice items | Dichotomous constructed-response items | Polytomous constructed-response items |
|---|---|---|---|
| Not applicable. | |||
| Rounds to zero. | |||
| Missing responses include the categories "omitted" and "not-reached." | |||
| An "off-task" response (constructed-response items only) is a response that is unrelated to the question. | |||
| PBA = Paper-based assessment. | |||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment. | |||
| Grade 4 | |||
| Number of items | 103 | 2 | 38 |
| Average percent missing | 9.59 | 4.70 | 10.19 |
| Minimum | 1.53 | 3.47 | 0.82 |
| Maximum | 43.08 | 5.92 | 37.65 |
| Average percent off-task | 0.62 | 0.26 | |
| Minimum | 0.47 | ||
| Maximum | 0.78 | 1.46 | |
| Average weighted percent correct | 57.79 | 44.02 | 41.98 |
| Grade 8 | |||
| Number of items | 115 | 1 | 50 |
| Average percent missing | 6.40 | 6.55 | 9.86 |
| Minimum | 0.55 | 6.55 | 1.24 |
| Maximum | 38.05 | 6.55 | 40.63 |
| Average percent off-task | 0.77 | 0.53 | |
| Minimum | 0.77 | ||
| Maximum | 0.77 | 2.83 | |
| Average weighted percent correct | 56.54 | 51.00 | 34.05 |
| Grade 12 | |||
| Number of items | 132 | 0 | 55 |
| Average percent missing | 4.12 | 9.22 | |
| Minimum | 0.41 | 0.70 | |
| Maximum | 13.54 | 30.88 | |
| Average percent off-task | 1.21 | ||
| Minimum | |||
| Maximum | 4.54 | ||
| Average weighted percent correct | 51.34 | 27.92 | |
Last updated 05 October 2023 (SK)