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Thread: Do you trust 23andme's Ancestry Composition or GEDmatch calculators more?

  1. #1
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    Do you trust 23andme's Ancestry Composition or GEDmatch calculators more?

    Some people say that 23andme predicts ancestry from the last 500 years, and that it is therefore more reliable than GEDmatch.

    I don't really agree because I've noticed very peculiar things happen with the 23andme calculator. I've seen families where one parent is Sicilian and the other is Irish. The Sicilian parent scores 15% Middle Eastern, while the child scores 0%. I've yet to see a half North European, half SE European (Cretan, Sicilian, Greek islander) score significant Middle Eastern even though full members of said groups score a significant amount.

    Likewise, I suspect 23andme underestimates admixture when it is small. I have seen that in people with under 10% of African, the African is greatly underestimated on 23andme.

    What do others think? I think due to its algorithms, 23andme ends up giving misleading results, but it is good for telling if a given ancestral component exists... just not necessarily the amounts.

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    Well here is the thing, there is NO standard to how these admixture tests should be analyzed between the various companies and third party tools.

    I personally prefer the analysis of 23andme, because it is conservative. I do enjoy thinking about deep ancestry, but I'm very interested in connecting with my roots in a paper trail time frame. If that's even possible!

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    In my case, I think 23andme was pretty accurate. 99.7% European including 91.1% Balkan. That fits pretty well with what I know about my ancestry.

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    23andme works better for people of one full ancestry, IMO. Not for people who are mixed with many things, in small amounts. I notice the most accurate results in relatively unmixed people.

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    Quote Originally Posted by Sikeliot View Post
    23andme works better for people of one full ancestry, IMO. Not for people who are mixed with many things, in small amounts. I notice the most accurate results in relatively unmixed people.
    Well I'm an American mutt, and 23andme IMHO was able to reasonably estimate my unknown Jewish ancestry. It is very far back from what I can gather. I finally have paper records into the 1700s for the line that it is coming from, and no obvious sign of it there (from paper record). OTOH, I have an Arbėreshė grandparent who I have inherited some West Asian from. FTDNA gives an inflated Asia Minor for this, which 23andme does not show.

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    Quote Originally Posted by Tįltos View Post
    Well I'm an American mutt, and 23andme IMHO was able to reasonably estimate my unknown Jewish ancestry. It is very far back from what I can gather. I finally have paper records into the 1700s for the line that it is coming from, and no obvious sign of it there (from paper record). OTOH, I have an Arbėreshė grandparent who I have inherited some West Asian from. FTDNA gives an inflated Asia Minor for this, which 23andme does not show.
    Wow that is really cool that you have an Arbėresh grandparent.

    I'm not an expert in autosomal calculations, but as far as I know, Albanians/Arbėresh don't score much on West Asian anyway. We are mainly Balkanic and Southern/SE European.

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    For me, 23andme is the best because it correctly distinguishes Iberian autosomal DNA from other southern European DNA. None of the other companies or Gedmatch calculators can do that. 23andme also gives a more accurate amount of Native American whereas the Gedmatch calculators have up to 2% noise in western Europeans. FTDNA myOrigins under reports Native American ancestry. Ancestry.com also provides a more accurate amount of Native American but it doesn't do as well for separating Iberian from other southern Europeans.

    Hands down 23andme is the best for Latin Americans and Iberians even if it might give us slightly lower amount of North African, Middle Eastern, and West African components than the actual genealogical ancestry.

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    The 23&me gave a big chunk of SA ancestry, and knowing that SA includes bangladesh, nepal, pakistan, srilanka and India (23&me aslo include afghanistan), it didn't help much. So gedmatch calculators were better for understanding my ancestry.

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    Quote Originally Posted by Trojet View Post
    Wow that is really cool that you have an Arbėresh grandparent.

    I'm not an expert in autosomal calculations, but as far as I know, Albanians/Arbėresh don't score much on West Asian anyway. We are mainly Balkanic and Southern/SE European.
    Thanks, from San Nicola dell'Alto, Italy.
    At FTDNA my mom who would have been half scores I think off the top of my head 23% Asia Minor. I'm 12% there. Over at 23andme she shows much more Balkan and just a noisy 0.1% MENA. My small amount of MENA actually shows as mostly coming from my father in split view at 23andme, with only a 0.1% showing from my mom there.

    I do think FTDNA made their admixture test slightly better from their original, but that's just my opinion. I really don't know if any standard in these autosomal tests can ever be imposed as autosomal DNA is randomly inherited from each line. I still prefer 23andme for this type of reading though.

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    Quote Originally Posted by ArmandoR1b View Post
    For me, 23andme is the best because it correctly distinguishes Iberian autosomal DNA from other southern European DNA. None of the other companies or Gedmatch calculators can do that.
    When Iberian is not a reference sample, Iberians find themselves scoring various combinations of Italian/Greek and British/Irish, as Iberians are genetically somewhere between the two.

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