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Thread: Algorithm update 23andMe.

  1. #291
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    Quote Originally Posted by Robert1 View Post
    Interesting you got 0.4% Sardinian, NixYO. Doesn't look like you have Southern Europe. Neither do I but I got the same percent Sardinian. It could be Swiss but probably a mistake.

    Attachment 40585
    Because it's sardinian which I believe is the closest modern proxy to EEF ancestry? It's almost certainly just the calculation trying to find a best fit for a bit of lacking EEF like ancestry

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  3. #292
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    Quote Originally Posted by sktibo View Post
    Because it's sardinian which I believe is the closest modern proxy to EEF ancestry? It's almost certainly just the calculation trying to find a best fit for a bit of lacking EEF like ancestry
    Otzi! I'm related to Otzi! He died close to Ticino, Switzerland or Bergamo, North Italy..

    Seriously, thanks, Sktibo. Makes sense.
     
    Estimated ancestry after reviewing Ancestry.com, 23&Me, FTDNA My Origins, Living DNA and known family history:
    33% English, 27% Scottish, 18% Welsh, 18% Irish, 4% German/Netherlands

    Y-DNA leads to Isle of Skye, Scottish Highlands: R1b>M343>L278>L754>L389>P297>M269>L23>L51>L151/L11>P312>Z290>L21/M529>DF13>L513/DF1>S5668>A7>Z21253> S7834 > S7828 > BY11203 > BY11186 (about 320-550 years old)

    MTDNA leads to Glamorgan, South Wales: K1a4a1f

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  5. #293
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    Quote Originally Posted by Robert1 View Post
    Otzi! I'm related to Otzi! He died close to Ticino, Switzerland or Bergamo, North Italy..

    Seriously, thanks, Sktibo. Makes sense.
    Otzi the highlander.

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  7. #294
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    Quote Originally Posted by Ruderico View Post
    That might be the case too, yes
    Any news on your French ancestor hunt? will you be trading your Portuguese egg-tart (sorry can't remember the proper name) in for a baguette?

  8. #295
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    I think I understand why the algorithm is doing such a bad job in some cases. I just realized it made my Chromosome Painting basically like I had one 100% European parent and one 100% WANA parent. I know that the first step of the algorithm is to phase (even if a parent has not tested) and it seems that this step in the pipeline is terribly inaccurate. Proper phasing can only occur when a parent tests, and so the majority of this 'guessed phasing' is totally wrong for some people like myself.

    Here's a tiny piece of my Chromosome painting so you can see what is happening:



    Pretty much every Chromosome looks as if one of my parent was 100% European, and the other was 100% WANA.

    In reality, both my father and mother would be 50/50 European and WANA themselves, so this assumption they are making during the phasing process is what causes the terribly inaccurate results in Dodecanese islanders. And it is why after phasing, the Broadly increases dramatically (up to 60% in one of matches that has phased) instead decreasing - because the real phasing ends up with two totally different phased haplotypes compared to the original 'guessed phasing'.

    Perhaps this is why AncestryDNA seems to fair much better with Dodecanese results - I heard it has a propriety phasing engine developed by themselves, while 23andMe is using the software Beagle. I don't know much about the actual process of using software like Beagle, but I can tell it is what ruins the results of certain ethnic groups.
    Code:
    23abc_AncestryDNA_scaled,0.110408,0.151314,-0.0290383,-0.0507112,0.0018465,-0.0156179,-0.00305514,-0.00138456,-0.00899905,0.00911181,0.00243583,-0.00149867,-0.00431116,0.00344057,-0.00773606,0.00106072,0.00195576,0.00152026,0.00251396,-0.00550264,-0.00786113,-0.00197844,0.0025882,0.00168699,0.000957998

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  10. #296
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    Greek Sarakatsan/Karakachan results (father's match):

    55.8% Greek Central Macedonia + 44.2% Greek Trabzon @ 1.46

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  12. #297
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    Quote Originally Posted by Scaperbzh View Post
    None. I had Brittany and Pays de la Loire as locations before, but since they haven't assigned me any F&G I guess they can't show up this time...
    There is therefore inconsistency between their ethnic analysis and their comparison by segment.
    Their comparison by segment is certainly more reliable!
    Y haplogroup: R1b: L21 --> DF13 --> BY145002
    The oldest L21 known are I2457 et I2565 from Stonehenge (Beaker Culture, 2400-1900 BC)

    MTDNA: U4c1
    The oldest U4c1 known are "poz224", Yamnaya culture (2882-2698 BC), and 2 Bell-Beaker in Germany (Karsdorf, 2314-2042 BC)

    Paternal MTDNA: K1b2b
    The oldest K1b2 are Eastern European Mesolithic: Kunda Donkalnis5 (Lithuania), 6000 BC and Meso-Ene Lepenski Vir Lepe28 in Serbia, 5900 BC.
    The oldest K1b2b is Alt-3, Corded-Ware Germany (2500 BC)

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  14. #298
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    I see that it tends to give you 95%-100% of one ethnicity, while completely ignoring other ethnicities. Previously, the problem with 23&me was that they gave many minor ancestries which were not true, but now it is not realistic either.

    All 17 Eastern European regions which they give me are not true. I have records of all 8 great-grandparents and 11 out of 16 great-great-grandparents. They could just guess at least one, but no, they have guessed 0. And they ignore the information about my grandparents which they have.

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  16. #299
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    This is the consecuence of a great smoothing. They have tried being more concretes, but by this way, it crearly ignores another real ancestries, some of them including in main cathegory.
    23andMe: 99.4% Spanish & Portuguese, 0.3% Ashkenazi Jewish, 0.3% Trace Ancestry (0.3% Nigerian)

    My Heritage: 91.5% Iberian, 3.6% Ashkenazi Jewish, 2.7% Middle East, 2.2% Irish, Sccotish and Welsh

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  18. #300
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    Quote Originally Posted by sktibo View Post
    Any news on your French ancestor hunt? will you be trading your Portuguese egg-tart (sorry can't remember the proper name) in for a baguette?
    Nothing solid, but I think 23abc's explanation might be why I have so much F&G, my chr painting looks like his too, half of chr2 and chr15 are fully F&G which seems very much unlikely. I believe the smoothing technique might be exaggerating part of my DNA that's Iberian but might just be a bit similar to NW Euro references' and they smooth the whole thing into F&G. I'd expect to have a region assigned if I had something as recent as a gg or ggg-grandparent of fully foreign origin too.

    I probably just randomly inherited more north-related and less south-related ancestry than most people around me. You may call me Ruderix and my pet dog Chouricix


    PS: Pastel de Belém (link)
    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

    Hidden Content
    Global25 PCA West Eurasia dataset Hidden Content

    [1] "distance%=1.6023"

    Ruderico

    Iberia_IA+Hallstatt,82.2
    Berber_EMA,10
    Rome_Imperial,7
    Levant_Roman,0.8

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