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A random sample of 1,794 was drawn from this group, after stratifying by primary sampling unit, type of healthcare provider, age, ethnicity, and sexual orientation. The staged design involved the selection of 75 primary sampling units (defined as metropolitan statistical areas or counties) across the United States, followed by the sampling of segments (defined as contiguous blocks) within each primary sampling unit, and then the sampling of housing units within each segment. Respondents in the 1990 SIPP file have been assigned a pseudo-stratum code and a pseudo primary sampling unit ( |
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