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How many X matches do you have?

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  • sharzie
    replied
    I am female. I have 106 FF matches and 20 X matches, almost 20%
    Sharon

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  • Kathy Johnston
    replied
    At FTDNA, you have to have an autosomal match meeting the criteria before an X match shows up. If you want to see your X-only matches, without having an autosomal match included, you have to upload to a third party site such as GEDmatch and you will only see those who have uploaded their Xs too.

    X matches will be listed on your match list, even those that are too small. I believe that there are a lot of coincidental, or IBS = identical by state X matches but these are showing up mostly on a female's match list. Males have more IBD, or identical by descent X matches because they only have one X to compare. In general, the number of X matches showing up for a male is much, much lower than for a female with the same ethnic makeup. I think the total number of males and total number of females testing is about the same but some people do not list their gender which makes it difficult to count. Some females are defaulting to males, or so it seems if they don't list their gender at all. Some females are testing their male family members but putting their own names on the test.

    I recently looked at 251 Family Finder matches and the number of X matches is indeed very interesting. I tried to calculate males and females as best as I could but there could be errors.

    Non-Jewish Diaspora males will find that an average of 1.3 % of their total matches will also have an X match. Therefore if you have a thousand matches, and you are a male, it is quite common to have around 10 to 20 X matches currently at FTDNA. It is coincidental that it is exactly 20 between a father and a son but I am not surprised. 56% of FF males in our project had four or fewer X matches. Jewish Diaspora males can have several hundred X matches.

    Non-Jewish Diaspora females find that an average of 25% of their total matches will also have an X match. I found that non-Jewish females had roughly an average of 124 X matches for the first 4 months of this year. Of their X matches, the females outnumber the males on average by 9 to 1. I know of one female who has more than 3,000 FF matches and over a thousand X matches as well but she shows a majority Jewish Diaspora in her myOrigins calculation. Her male to female X ratios were much higher too.

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  • rod
    replied
    Two - my mother and my brother.

    I have several predicted matches that don't match my mother.

    My mother's 2nd cousin's daughter whose relationship would qualify her to be an x match doesn't match on x but she is a close autosomal match.

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  • Germanica
    replied
    Looks like coincidence. I have 25 X matches so 20 is not the max limit.

    However, I know for a fact that their system isn't registering all X matches. On Gedmatch, an individual will show as an X match but the same individual on FTDNA doesn't. I think FTDNA is dismissing matches with only small segment matches but I wish we had the ability to set our own criteria, like Gedmatch.

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  • a shepherd
    replied
    I have 1062 FF matches and only 9 X matches. Yesterday I noticed one of my FF matches that is also on gedmatch showing X matching on gedmatch but not showing X on FF.

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  • JD Edwards
    started a topic How many X matches do you have?

    How many X matches do you have?

    I have a total of 938 FF matches with only 20 X Chromosome matches...My Dad has a total of 859 FF matches with 20 X Chromosome matches. I know he and I wont share X Chromosome matches....But is it just pure coincidence that we each have exactly 20 X matches? Or is there a maximum limit that can be displayed etc?
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