DNA test result-conclusions - what accounts for the significant differences

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ericdubois
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The main issue is that we're using a sample base of contemporary testers to estimate ancestry thousands of years ago. Differences in the sample base, the self-identification of the testers, and the algorithms used explain why each company comes with different results. At a continental level, it works fairly well. At a more regional level, there has been so many migrations and the DNA is so mixed that it's hard to distinguish English from German, etc.

This article goes into a bit more details https://www.livescience.com/62690-how-dna-ancestry-23andme-tests-work.html

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