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Thread: How do MyHeritage's and 23andme's criteria for the Ashkenazi category differ?

  1. #1
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    How do MyHeritage's and 23andme's criteria for the Ashkenazi category differ?

    My 23andme kit (beta enabled) predictably gave me 99.1% Ashkenazi, 0.5% Broadly European, and 0.2% Broadly Levantine. But to my surprise, my MyHeritage kit puts me at ~82% Ashkenazi and ~18% Greek and South Italian. I uploaded my 23andme kit to MyHeritage back when the site was allowing you to do that for free, and the results are basically the same except they gave me a little bit of just "Italian" in addition to Greek and South Italian. Looking through my top matches on MyHeritage, I noticed that almost none of them score 100% Ashkenazi. (So far I have only found one person who has 100%.) Their reports have something else, usually including one or more of Mizrahi, Sephardi, locations from the MENA region or even Central Asia, or Greek and South Italian like I have. These additional percentages roughly range from 2-20%. Maybe some of them do have ancestors who belong to these groups, but the fact that I got so much Greek and have found other Ashkenazim who have had similar discrepancies between MyHeritage and 23andme makes me wonder a) what MyHeritage's model/range for Ashkenazi actually looks like and b) whether these additional groups MyHeritage is giving people actually point to some meaningful variation or geographic differences, and what those differences actually are.

    Does anybody here have insight into these questions?

    For what it's worth, I tried comparing myself to random South Italian, Sicilian, and Greek GEDmatch kits I found on Google and I did routinely get lots of matches in the 5-7 cM range with people from various Greek islands, especially the Peloponnese. But I got a lot of matches like that from other peoples in the Eastern Mediterannean so I don't know what the significance of that is...

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     Claudio (08-03-2019),  passenger (08-02-2019),  StillWater (08-02-2019)

  3. #2
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    I've noticed that the ones who do score 100% Ashkenazi on there are either from Central Europe or are regionally mixed. Link the page you got the Greek kits from. I'll compare myself as well.
    הִנְנִי֩ מֵבִ֨יא אוֹתָ֜ם מֵאֶ֣רֶץ צָפ֗וֹן

    Jeremiah 31

  4. #3
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    Quote Originally Posted by StillWater View Post
    I've noticed that the ones who do score 100% Ashkenazi on there are either from Central Europe or are regionally mixed. Link the page you got the Greek kits from. I'll compare myself as well.
    This is what I found. I imagine somebody like Sikeliot knows where to find more. It looks like the kits at bottom all refer back to "unpublished data" gathered by DM Behar or somebody else involved with his papers.

    H912436 Crete
    M838603 Crete
    A378287 Peloponnese
    A097858 Grevena
    CL6099358 Kefalonia
    A843707 Peolopnnese
    A684751 Icaria
    M846042 Volos and Eubea
    A684751 Icaria, Aegean
    A318570 Kalymnos, Dodecanese
    M179262 Karpathos, Dodecanese
    A059192 Olympia and Kalymnos
    A570896 Andros, Aegean
    M053465 Chios, Aegean
    A947163 Chios, Aegean
    M168143 Chios, Aegean
    A140718 Ikaria, Aegean
    A484290 Symi, Dodecanese
    M871606 Karpathos, Dodecanese

    Z714983 GreeceCentr1
    Z131291 GreeceCentr10
    Z210352 GreeceCentr2
    Z401858 GreeceCentr3
    Z602601 GreeceCentr4
    Z476541 GreeceCentr5
    Z368850 GreeceCentr6
    Z880378 GreeceCentr7
    Z825068 GreeceCentr8
    Z880891 GreeceCentr9
    Z829678 GreeceThessaly1
    Z407001 GreeceThessaly10
    Z313992 GreeceThessaly2
    Z376248 GreeceThessaly3
    Z741721 GreeceThessaly4
    Z580405 GreeceThessaly5
    Z812683 GreeceThessaly6
    Z260052 GreeceThessaly7
    Z197487 GreeceThessaly9
    Z090265 GreeceThessaly8
    Z418934 GreeceMaced1
    Z274631 GreeceMaced2
    Z721721 GreeceMaced3
    Z244127 GreeceMaced4
    Z823091 GreeceMaced6
    Z455687 GreeceMaced7
    Z608982 GreeceMaced8
    Z351478 GreecePelop1
    Z659969 GreecePelop10
    Z106701 GreecePelop3
    Z280331 GreecePelop4
    Z368114 GreecePelop5
    Z482928 GreecePelop6
    Z691528 GreecePelop7
    Z686475 GreecePelop8

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  6. #4
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    Quote Originally Posted by jetshop View Post
    My 23andme kit (beta enabled) predictably gave me 99.1% Ashkenazi, 0.5% Broadly European, and 0.2% Broadly Levantine. But to my surprise, my MyHeritage kit puts me at ~82% Ashkenazi and ~18% Greek and South Italian. I uploaded my 23andme kit to MyHeritage back when the site was allowing you to do that for free, and the results are basically the same except they gave me a little bit of just "Italian" in addition to Greek and South Italian. Looking through my top matches on MyHeritage, I noticed that almost none of them score 100% Ashkenazi. (So far I have only found one person who has 100%.) Their reports have something else, usually including one or more of Mizrahi, Sephardi, locations from the MENA region or even Central Asia, or Greek and South Italian like I have. These additional percentages roughly range from 2-20%. Maybe some of them do have ancestors who belong to these groups, but the fact that I got so much Greek and have found other Ashkenazim who have had similar discrepancies between MyHeritage and 23andme makes me wonder a) what MyHeritage's model/range for Ashkenazi actually looks like and b) whether these additional groups MyHeritage is giving people actually point to some meaningful variation or geographic differences, and what those differences actually are.

    Does anybody here have insight into these questions?

    For what it's worth, I tried comparing myself to random South Italian, Sicilian, and Greek GEDmatch kits I found on Google and I did routinely get lots of matches in the 5-7 cM range with people from various Greek islands, especially the Peloponnese. But I got a lot of matches like that from other peoples in the Eastern Mediterannean so I don't know what the significance of that is...

    Do you get these Aegean matches at the default 7cm threshold setting?

  7. #5
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    Quote Originally Posted by StillWater View Post
    I've noticed that the ones who do score 100% Ashkenazi on there are either from Central Europe or are regionally mixed. Link the page you got the Greek kits from. I'll compare myself as well.

    Nice Profile pic

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     StillWater (08-03-2019)

  9. #6
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    Of your set, I matched these for 5cm<segments <7cm:

    M838603 Crete
    A947163 Chios, Aegean
    A140718 Ikaria, Aegean


    Z602601 GreeceCentr4
    Z880378 GreeceCentr7
    Z197487 GreeceThessaly9
    Z090265 GreeceThessaly8
    Z274631 GreeceMaced2
    Z721721 GreeceMaced3
    Z823091 GreeceMaced6
    Z368114 GreecePelop5
    Z691528 GreecePelop7
    הִנְנִי֩ מֵבִ֨יא אוֹתָ֜ם מֵאֶ֣רֶץ צָפ֗וֹן

    Jeremiah 31

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     Claudio (08-03-2019)

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    Quote Originally Posted by StillWater View Post
    Of your set, I matched these for 5cm<segments <7cm:

    M838603 Crete
    A947163 Chios, Aegean
    A140718 Ikaria, Aegean


    Z602601 GreeceCentr4
    Z880378 GreeceCentr7
    Z197487 GreeceThessaly9
    Z090265 GreeceThessaly8
    Z274631 GreeceMaced2
    Z721721 GreeceMaced3
    Z823091 GreeceMaced6
    Z368114 GreecePelop5
    Z691528 GreecePelop7
    At the default Gedmatch Settings?

  12. #8
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    Quote Originally Posted by Claudio View Post
    At the default Gedmatch Settings?
    No, because the default sets the min segment to 7cm. I adjusted it to 5cm.
    הִנְנִי֩ מֵבִ֨יא אוֹתָ֜ם מֵאֶ֣רֶץ צָפ֗וֹן

    Jeremiah 31

  13. #9
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    Quote Originally Posted by Claudio View Post
    Nice Profile pic
    You're Michelangelo and I'm David.
    הִנְנִי֩ מֵבִ֨יא אוֹתָ֜ם מֵאֶ֣רֶץ צָפ֗וֹן

    Jeremiah 31

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     Claudio (08-03-2019)

  15. #10
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    Quote Originally Posted by StillWater View Post
    No, because the default sets the min segment to 7cm. I adjusted it to 5cm.
    Do you match any segments with these kits at default 7cm Setting?

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