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Thread: A lot of shared matches

  1. #1
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    A lot of shared matches

    With a person with mostly Iberian ancestry 98.7% to be precise. 510 shared matches.

    chr 9- 9.4 cMs in pile up region

    chr 12 -9.3 cMs

    chr 13- 6.1 cMs

    chr 15 - 7.1 cMs

    chr 22 -7.7 cMs

    Only ethnicity we have in common is Finnish 2.2 % me and 1.3% her.
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    Every now and again I also find many Scandinavian matches with pretty decent amounts of total shared DNA (40-ish cM) but it is always spread among 3 or more segments making the longest one actually in the range of 8-9 cM. As I have my parents tested too I am positively sure these are false positives but of course I can't be sure of your case.

    As far as I know, the most reliable parameter to identify a match is the length of the longest segment shared and not the total amount. If the segment is smaller than 12 cM, most likely it is a false positive.
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    Yes, I agree with the above. I have a lot of matches on MH, if I sort by location, that seem to have a decent overall match, but all the segments are under 10 and they don't match either of my parents. So false matches.

    I expect these exist on FTDNA too, but I don't see them since I haven't had the ability to check out matches in other countries, so have just been working my way down from most significant match and don't get to the fluke ones.

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    On FTDNA I've got quite a few 3-5th cousin matches with over a 100 shared matches. My heritage gives me several Scandinavian matches with largest segment 13cMs or more and 100 or near to 100 shared matches.
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    At least anecdotally since FTDNA changed its chip, I seem to be getting more matches. Unfortunately, with even 2nd cousin matches, I am finding no plausibility with almost all when I examine the ones providing trees or ancestral names.

    Jack
    Last edited by C J Wyatt III; 07-09-2019 at 06:49 PM.

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    I've contacted a good number of 2nd-4th cousins at FTDNA and have drawn a big blank. There's a YDNA same surname match that's 37-2 but won't test further despite my offer to pay. I have a 4th-remote cousin match(27-10) with someone who has ancestors with my surname but I've not been able to find a connection.
    My father has a 3rd-5th cousin match on FTDNA and My heritage with someone who has an ancestor with our surname. That person doesn't match me on FTDNA or My heritage.
    Last edited by firemonkey; 07-09-2019 at 08:15 PM.
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  9. #7
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    Today I had a Chinese match without any known European ancestry. We share one segment with length 11cM.

    Seriously, they should rethink the thresholds.
    Last edited by Shadogowah; 07-15-2019 at 12:09 PM.
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    Quote Originally Posted by Shadogowah View Post
    Today I had a Chinese match without any known European ancestry. We share one segment with length 11cM.

    Seriously, they should rethink the thresholds.
    Keyword is "known". After circumnavigation became common, a lot of sailors spread their DNA around the globe.

    It is not just the thresholds which need rethinking, but the whole methodology.

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    Quote Originally Posted by C J Wyatt III View Post
    Keyword is "known". After circumnavigation became common, a lot of sailors spread their DNA around the globe.

    It is not just the thresholds which need rethinking, but the whole methodology.
    The possibility that I have a common ancestor with Mr. Wong in the last 500 years is probably several orders of magnitude more remote than having one with the other Scandinavian false positives I mentioned above.
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