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| Unacceptably, Ancestry doesn’t even test all of one’s DNA. Refusing to test all of one’s DNA brings about inherent selection bias, which brings about inherent confirmation bias. |
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| Ancestry does not balance group numbers or double check its work. |
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| Some of its groups are well under 400, and some of its groups are well over 1000. It has no control group whatsoever. |
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| Ancestry admits to not testing parts of DNA. |
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| Ancestry admits to throwing out certain DNA samples. |
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