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Why are some of the detailed data available at the national level not also available at the state, metropolitan area, county, and city level?

April 26, 2017area city County Data level Metropolitan National State

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Why are some of the detailed data available at the national level not also available at the state, metropolitan area, county, and city level?

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National data come from all 60,000 household in the Current Population Survey. The survey sample size is not large enough at the local, or even state, level to provide the same level of detail in the estimates. Note that National data are NOT the sum of local area estimates.