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NAEP Sample Design → Sample Design for the 2000 Assessment → State Assessment Sample Design in 2000 → Stratification of Schools in the Sampling Frame for the 2000 State Assessment → Median Household Income for the 2000 State Assessment Median Household Income for the 2000 State Assessment
For each combination of jurisdiction and grade with neither available nor usable achievement data, median household income served as the implicit school stratification variable. A school's median household income resulted from matching its ZIP code against a geographic-based median household income file derived by Donnelly Marketing Analytical Services from 1990 Census data. Any school still missing an income value after the match received the average median household income calculated for the three-digit ZIP code prefix or county of its location. Last updated 08 May 2008 (MH) |
