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NAEP Assessment Sample Design → NAEP 2004 Long-Term Trend Sample Design → Sampling of Schools and Students → Long-Term Trend School Sample Selection → Long-Term Trend School Sample Measures of Size → Long-Term Trend Age Distribution Fractions

NAEP Technical DocumentationLong-Term Trend Age Distribution Fractions

			Age Distribution Fractions for Ages 9 and 13 Age Distribution Fractions for Age 17

The computation of the age distribution fractions that are components in the school measures of size was done using different methods depending on age group. For age 9 and 13, a breakout by every birth-year cohort represented in the relevant grades was fully carried out. The approach was simpler for the age 17 sample, using an age range between 16 and 17 years old, notwithstanding the "age 17" terminology.

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