knitr::opts_chunk$set( collapse = TRUE, comment = "#>" )
Vintages are years like 2020 or 2005. The vintage of a product like decennial or ACS data is the year, or most recent year, that it corresponds to.
Time spans apply to American Community Survey data. Currently, the ACS reports 1-year data and 5-year data. There was a brief window of time when they reported 3-year data, but no longer.
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