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NAEP Sample Design → NAEP 2004 Long-Term Trend Sample Design → Long-Term Trend Sampling of Primary Sampling Units → Final PSU Samples

NAEP Technical DocumentationFinal Primary Sampling Unit Sample

A primary sampling unit (PSU) sample was drawn independently from each of the 60 strata defined in Final Primary Sampling Unit Strata. One PSU was selected with probability proportionate to size (with size equal to number of youths) within each stratum.

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