Page 52 of 52 FirstFirst ... 242505152
Results 511 to 515 of 515

Thread: Algorithm update 23andMe.

  1. #511
    Registered Users
    Posts
    3
    Sex
    Ethnicity
    Dutch/English
    Nationality
    Canadian
    Y-DNA (P)
    Z346
    mtDNA (M)
    H3

    Canada Devon Netherlands Noord-Brabant
    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.

  2. The Following User Says Thank You to symons97 For This Useful Post:

     laulei (12-31-2020)

  3. #512
    Registered Users
    Posts
    1,503
    Sex

    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.

  4. The Following 3 Users Say Thank You to Riverman For This Useful Post:

     Cascio (01-02-2021),  jadegreg (01-04-2021),  rober_tce (01-10-2021)

  5. #513
    Registered Users
    Posts
    306
    Sex
    Location
    Seoul City
    Ethnicity
    Greco-Bactrian

    Greece Romani
    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
    Registered Users
    Posts
    997
    Sex
    Y-DNA (P)
    R1a1a1b1a2b3
    mtDNA (M)
    U5a2b

    Polish–LithuanianCommonwealth Bulgaria Byzantine Empire Russian Federation Israel Russia Imperial
    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.

  7. The Following User Says Thank You to CyrylBojarski For This Useful Post:

     Markos (01-14-2021)

  8. #515
    Registered Users
    Posts
    306
    Sex
    Location
    Seoul City
    Ethnicity
    Greco-Bactrian

    Greece Romani
    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


  9. The Following User Says Thank You to Markos For This Useful Post:

     CyrylBojarski (01-14-2021)

Page 52 of 52 FirstFirst ... 242505152

Similar Threads

  1. MASSIVE 23andMe update for South Asians!
    By Adam A in forum Southern
    Replies: 96
    Last Post: 06-23-2019, 06:38 AM
  2. 23andme ancestry composition update
    By Dibran in forum 23andMe
    Replies: 3
    Last Post: 11-12-2018, 08:17 PM
  3. Update of a tool for Y-DNA from 23andme
    By ArmandoR1b in forum 23andMe
    Replies: 4
    Last Post: 10-16-2018, 04:08 PM
  4. 23andMe: Haemochromatosis Update
    By DMXX in forum 23andMe
    Replies: 3
    Last Post: 12-04-2015, 01:52 PM
  5. Info Update From 23andMe
    By Gary Corbett in forum 23andMe
    Replies: 1
    Last Post: 08-13-2014, 01:23 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •