| Source | Lead time (years) | |||
|---|---|---|---|---|
| 1 | 2 | 3 | 4 | |
| Absolute value of percentage difference between actual and projected values | ||||
| Projections of Education Statistics to 2017 | † | 0.7 | 1.1 | 1.4 |
| Projections of Education Statistics to 2018 | 0.4 | 0.7 | 0.8 | 1.1 |
| Projections of Education Statistics to 2019 | # | 0.1 | 0.2 | † |
| Projections of Education Statistics to 2020 | 0.2 | 0.4 | † | † |
| Mean absolute percentage error | ||||
| Example | 0.2 | 0.5 | 0.7 | 1.3 |
| † Not applicable. | ||||
| # Rounds to zero. | ||||
| NOTE: The mean absolute percentage errors presented on this table are for illustrative purpose only. Calculations are based on unrounded numbers. | ||||
| SOURCE: U.S. Department of Education, National Center for Education Statistics, Common Core of Data (CCD), “State Nonfiscal Survey of Public Elementary/Secondary Education,” 2005–06 through 2010–11; and Projections of Education Statistics, various editions. (This exhibit was prepared March 2012.) |
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