Description Usage Format Source References See Also
This data set records the population and the three most frequently reported ancestries by US county, according to the 2000 census.
1 |
A data frame with 3219 observations on the following 5 variables.
county A factor. An attempt has been made to make the
levels look similar to the county names used in the maps
package.
populationa numeric vector
topa character vector
seconda character vector
thirda character vector
U.S. Census Bureau. The ancestry data were extracted from Summary File 3:
http://factfinder.census.gov/jsp/saff/SAFFInfo.jsp?_pageId=sp4_decennial_sf3
which is based on the ‘long form’ questionnaire (asked to 1 in 6 households surveyed).
http://www.census.gov/prod/cen2000/doc/sf3.pdf
mapplot, for examples.
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