I downloaded an IPUMS data set about commute type for various metro regions, however, for some reason I can’t seem to match the data on the American Factfinder website, which I was doing just to confirm I understand things correctly. When I look at total workers over 16 years of age, for the Raleigh metro (39580) I get either 656,611 from the ACS 1 year or 616,341 from the ACS 5-year. The American Factfinder site says that it is using the ACS 5-year. Since I’m looking at commute type breakdown, I also checked percentages and still couldn’t match the American Factfinder data perfectly. When I look at driving alone, I get 80.2% (in Raleigh metro) from the ACS 1-year, 80.7% from the ACS 5-year, and using the numbers on the American Factfinder site, I get 80.3%, so the ACS 5-year is a larger difference even though it is what the Factfinder says it is using.
So where does the difference here come from? Which data set should I be using?
Thanks. - Josh