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Thread: Big Y Matches

  1. #1
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    Ireland European Union

    Big Y Matches

    Has anyone tried the new Big Y Matches feature.
    I have 50 matches but 30 of these appear to be suspect as they exclude my previous terminal SNP DF21.
    My #1 match (0 SNP difference) is as predicted and shares the new terminal SNP S5456 with me.
    I suspect that the matching algorithm could be improved by giving more weight to immediate defining mutations eg. DF21 in my case.
    Gerard Corcoran
    R1b-DF21-S5456-S6166, H1C1

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

     Pillar_of_fire (06-12-2014)

  3. #2
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    Having tested with YFull, and thanks to the great work of one of my project administrators, I can say that I would not have listed some of the matches listed under my Big Y tab on FTDNA.

  4. #3
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    I am getting exactly same window when I click on BigY Results or BigY Matches -- and I do not see any one I match...?
    G
    Y-DNA111/ Geno 2.0 /BigY- R1b1a2a2a - R-FGC14600
    mt- DNA FMS K1a1b1a
    MyO: 87 % Ashk Diasp, 7% - Asia Minor, 6% - East Europe

  5. #4
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    Quote Originally Posted by Goldschlager View Post
    I am getting exactly same window when I click on BigY Results or BigY Matches -- and I do not see any one I match...?
    They yield the same results. By saying you don't see anyone that you match, are you saying that you have no matches?

  6. #5
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    I see "113 of 128 entries". I share between 48 and 61 novel SNPs. My closest match is the same as identified on the U152 project and Richard Rocca's U152 tree.

    The columns across the top of the BigY matches are:
    Match Name, Shared Novel Variants, Known SNP Difference, Non-Matching Known SNPs, Matching SNPs, Match Date
    Y DNA line continued: Z142>Z12222>FGC12378>FGC12401>FGC12384
    37% English, 26% Scot/Ulster Scot, 14% Welsh, 14% German, 3% Ireland, 3% Nordic, 2% French/Dutch, 1% India
    Hidden Content

  7. #6
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    Right -- absolutely none. Are matches with others who got BigY?
    G
    Y-DNA111/ Geno 2.0 /BigY- R1b1a2a2a - R-FGC14600
    mt- DNA FMS K1a1b1a
    MyO: 87 % Ashk Diasp, 7% - Asia Minor, 6% - East Europe

  8. #7
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    I believe so. My closest match is another BigY participant and I see a few others I recognize.
    Y DNA line continued: Z142>Z12222>FGC12378>FGC12401>FGC12384
    37% English, 26% Scot/Ulster Scot, 14% Welsh, 14% German, 3% Ireland, 3% Nordic, 2% French/Dutch, 1% India
    Hidden Content

  9. #8
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    118 entries, 64 of them aren't in my subclade (U152). And the person I share an important novel variant with, doesn't even show.
    Avatar:
    Roman helmet, gilded silver, 319-323 A.D. Made by Marcus Titus Lunamis. Found in 1910, Helenaveen, The Netherlands.
    Its owner belonged to the sixth cavalry unit of the Equites Stablesiani. On the right side of the helmet cap it says ‘Stablesia VI'.

  10. #9
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    I have 24 matches, all with those who have taken the BigY test. I am R1a, M-458, L1029. Some of my matches are from the sister subclade, L260, so they aren't very relevant. The remainder concur with the data provided at the R1a1a and Subclades Y-DNA Project.

  11. #10
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    Quote Originally Posted by Heber View Post
    Has anyone tried the new Big Y Matches feature.
    I have 50 matches but 30 of these appear to be suspect as they exclude my previous terminal SNP DF21.
    My #1 match (0 SNP difference) is as predicted and shares the new terminal SNP S5456 with me.
    I suspect that the matching algorithm could be improved by giving more weight to immediate defining mutations eg. DF21 in my case.
    I agree. That's a good requirement to submit. More youthful should be weighted higher, but that requires knowledge of the phylogenetic tree, which is ever changing.

    I can see this part of the reason they had to hold a fairly constant coverage for Big Y, their so-called "gold" regions. If people are measured on different regions, matching on total SNPs is of little value.

    I'm not sure their general approach is wrong, though. NGS tests and parallel sequencing in general, does not produce black/white absolutely derived/absolutely ancestral results. There are shades of gray. Therefore, the overall pattern is more important than any one SNP.

    This goes back to the point the U106 admin, Charles, made some time ago. "It's not the SNP. It's the subclade." Fortunately, phylogenetic equivalents make this is approach viable. In reality, SNP and STR matching should eventually be integrated. Sounds like a algorithm creation job for rocket scientists, i.e. Ken Nordtvedt.
    Last edited by TigerMW; 06-13-2014 at 05:52 PM.

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     Heber (06-13-2014)

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