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Thread: Algorithm update 23andMe.

  1. #511
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    Quote Originally Posted by Riverman View Post
    That's because of the smoothing out effect. Less significant, not very clearly assignable segments get assigned to the majority ancestry of the neighbouring segments. That was necessary because English, Dutch, Northern Germans and Danish share a lot of ancestry in common. The same segments must be assigned to different ethnicities, to reflect the majority ancestry of more customers. So they had the choice of either doing that, or still giving Germans in particular way too much British, Scandinavian, etc.

    In the end, English and Dutch are just very close at times. FTDNA's ancestry estimate is rather like an oracle, it just tries to model ancestral components with best fits. That can work in some, but goes more often horribly wrong in most. The methods of 23andme are much better, but they might miss nuances at times as well.
    Thank you so much, very helpful. I was imagining the English would get pulled to continental germany/dutch/Danish. In your opinion do you think this shift would reflect migration in the last 1500 years to England? I have no scot or Irish ancestory on 23andme and on paper.

    Also does any one have thoughts on the brand new .4 iranian at 90% confidence? When I've never had none European scores before.

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  3. #512
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    Quote Originally Posted by symons97 View Post
    Thank you so much, very helpful. I was imagining the English would get pulled to continental germany/dutch/Danish. In your opinion do you think this shift would reflect migration in the last 1500 years to England? I have no scot or Irish ancestory on 23andme and on paper.
    Its the Angles, the Saxons, Jutes and Normans, as well as Medieval and modern continental immigration which makes the English German-like. But even the Celtic ancestry of the Isles, as well as the Roman time influences, are not so fundamentally different, as any PCA can prove. More different, but in the mix with the continental Gemranic-Romance, not as much. And with the Anglo-Saxons in particular we speak about shared segments, basically the same segments on both sides of the channel. It might be possible to differentiate in a lot of cases, with a perfect algorithm and thoroughly sampling, but even then any calculation would end up with segments which are the same, but present on both sides.

    Also does any one have thoughts on the brand new .4 iranian at 90% confidence? When I've never had none European scores before.
    Some pages back my theory was that because of the smoothing effect, some extreme segments which would otherwise be put in a less exotic ancestral component, end up as extremely exotic. For example I never get North African anywhere, I never got it before, and now I too have one single small segment assigned that way. Similar things happened with other people, its most of the time just one single segment, at most two and its just trace level. In my opinion, its forgettable, unless you find actual matches which represent the ancestry on this segment.

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  5. #513
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    Quote Originally Posted by mildlycurly View Post
    Coptic Egyptian is going to become 23andme's answer to MH's "Nigerian", I just know it.
    That and Sudanese.
     
    Dodecad K12b
    Distance: 0.8790% / 0.87904303
    Target: Markos | ADC: 0.5x RC
    68.0 Greek_Athens
    21.8 Greek_Foca
    8.4 Balkan_Gypsy
    1.8 Greek_Lemnos

    G25 Modern
    Distance: 1.4201% / 0.01420105
    Target: Markos_scaled
    41.5 Greek_Peloponnese
    39.5 Greek_Crete
    10.0 Roma_Barcelona
    9.0 Greek_Thessaly

    Eurogenes K13
    Distance: 1.6988% / 1.69878934
    Target: Markos | ADC: 0.25x RC
    65.3 Greek_West
    29.1 Greek_Symi_Island
    5.6 Gypsy_Wallachia


  6. #514
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    Quote Originally Posted by Markos View Post
    That and Sudanese.
    I know many South-Eastern Europeans, who got trace of SSA after update. I know fully Bulgarian, who got about 0,5% Sudanese, Bosnian with 0,3% Sudanese and Romanian/Hungarian with very little Somali.

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  8. #515
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    Quote Originally Posted by CyrylBojarski View Post
    I know many South-Eastern Europeans, who got trace of SSA after update. I know fully Bulgarian, who got about 0,5% Sudanese, Bosnian with 0,3% Sudanese and Romanian/Hungarian with very little Somali.
    Yup, I get 0.3% Sudanese. Can't take it seriously just yet from seeing others getting it too. It's on the same chromosome with a big S. Asian segment of mine, so seems a bit weird.

    Maybe something to look into though.
    Attached Images Attached Images
     
    Dodecad K12b
    Distance: 0.8790% / 0.87904303
    Target: Markos | ADC: 0.5x RC
    68.0 Greek_Athens
    21.8 Greek_Foca
    8.4 Balkan_Gypsy
    1.8 Greek_Lemnos

    G25 Modern
    Distance: 1.4201% / 0.01420105
    Target: Markos_scaled
    41.5 Greek_Peloponnese
    39.5 Greek_Crete
    10.0 Roma_Barcelona
    9.0 Greek_Thessaly

    Eurogenes K13
    Distance: 1.6988% / 1.69878934
    Target: Markos | ADC: 0.25x RC
    65.3 Greek_West
    29.1 Greek_Symi_Island
    5.6 Gypsy_Wallachia


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  10. #516
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    My father (100% Limousin, Occitania, France) :

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  12. #517
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    Quote Originally Posted by Fitis View Post
    My father (100% Limousin, Occitania, France) :
    Hello, are you just from Occitania?

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  14. #518
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    Quote Originally Posted by Aben Aboo View Post
    Hello, are you just from Occitania?
    The Limousin is in the center-west of France. Occitania is a recent term, not a real historic term (my friend's maternal grandfather, who is from Villemur-sur-Tarn and Tarn, in the non-Basque south-west, don't use the "Occitanie" term nor does he call himself "Occitan").

    Otherwise, when there is no regional precision in "spanish portuguese" category, it must be considered as coming from the French part: for example, my native friend of Berry (totally) obtains 25% of "Spanish portuguese" on 23andme . My other friend, whose ancestors are from Béarn, Picardie and Sarthe, obtains 30% of "spanish portuguese".

    But both stand out as French, except that my second friend draws a little more towards the Basques (but not a huge difference).

    The results are sometimes to be interpreted on 23andme, as on Myheritage (even more on Myheritage).

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  16. #519
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    F&G can indeed be a problematic category for many people of West European background, I myself got 6% without any regional identification. I suppose they could try splitting it into different things, for example creating a more specific grouping for southern French, but then I suspect it'd bleed into northern Italy and Iberia.
    YDNA E-Y31991>PF4428>Y134097>Y134104>Y168273>FT17866 (TMRCA ~1100AD) - Domingos Rodrigues, b. circa 1690 Hidden Content , Viana do Castelo, Portugal - Stonemason, miller.
    mtDNA H20 - Monica Vieira, b. circa 1700 Hidden Content , Porto, Portugal

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    Global25 PCA West Eurasia dataset Hidden Content

    [1] "distance%=1.6007"

    Ruderico

    NW_Iberia_IA,80.4
    Berber_EMA,11
    Roman_Colonial,8.6

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  18. #520
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    Hello,
    "Occitan" is not a recent term and The Limousin was part of the Kingdom of Aquitaine and before of Wisigothics in South France.
    People of the Limousin in the past talked an occitan language.
    Bi language at our time for some names of Limousin's cities800px-Signalisationbilinguelimousin.jpg
    Yeah Spanish and Portuguese for french people in 23andMe results with no mix from iberians Peninsula parents is mainly from the South of France.
    I have a lot of spanish and Portuguese with 23andMe and a lot of basques french with G25.
    In fact lol, culturally, genetically, on historic view etc, we can to say the South in France begins under the Loire
    Last edited by Aben Aboo; 03-13-2021 at 02:15 PM.

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