P. Johnson emailed asking, “Why are my ethnicity percentages so different at Ancestry and FTDNA.”
There are actually a few reasons.
- Each company has a different pool of DNA to work with
- Each company has different algorithms to calculate the percentages
- Each company breaks up the geographic regions a little differently
Another thing to watch out for is that all of the companies update your percentages as their DNA pool gets bigger and they run the algorithms again. The algorithms themselves are also updated. 23andMe tells you when they last ran your results through. I don’t see this information on the other sites but I could just be missing it.
Copyright © 2016 Michèle Simmons Lewis