DSDR KB:
Q:
I am using data from the American Community Survey (ACS) for Monroe and Lenawee counties in Michigan. The tables from American Factfinder have margins of error for all the cells. However, if I am combining the two counties is there a way to calculate new margins of error based on this larger population?
A:
The best description of the way to do this is in this technical appendix:
Appendix 7 has several examples of computing margins of error when one is combining geographies (counties, census tracts, etc.).
Another associated resource is the following spreadsheet, which walks one through the examples provided in Appendix 7. There are separate worksheets for each example - counts, proportions, and ratios:
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