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Thread: Sample Bias?

  1. #51
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    Quote Originally Posted by Pylsteen View Post
    131/229 (ca. 58%) of I-M253 is "stuck" at the I-M253 level; 75/441 (ca. 18%) of R-M343 is stuck at M343 or M269; if I would drop those, the percentage of remaining I1 goes down against R1b and this affects the percentages of subclades of the total too.
    If I drop every seemingly basic results in all haplogroups, I am left with 662/988 "slightly to good defined" Dutch results to work with.
    In that case, I-Z63 is 19/662 (ca. 2,9%) of all "defined" Dutch lineages.
    Of the "defined" I-M253 lineages (229 minus the 131 "basic" = 98), I-Z63 is 19/98 = ca. 19,38%.
    If I choose to keep working with all 988 dutch results (including the basic ones), and assume that among all I-M253, I-Z63 is found at ca. 19,4%, then I get an estimate of (0,194x229)/988 = ca. 4,5% of I-Z63 in the whole population.
    Hope it's clear what I am doing.
    Why are you so "stuck" on the M253 of course most of them up to 99% will be under DF29.

  2. #52
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    Quote Originally Posted by Username View Post
    Why are you so "stuck" on the M253 of course most of them up to 99% will be under DF29.
    Yes, I agree with that. It seems reasonable to me to assume there will be not much difference in the percentages of subclades found in the defined groups and the yet undefined group. As long as the data set is large enough and I state that I make use of extrapolation/induction, it will probably not be a large problem. Well, that's it for today.

  3. #53
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    One more interesting thing about the chart is Spain and I1 particularly Z63. I did some rough calculations. It shows 943 R-343 and if that represents about 60% of the population you add the 99 samples of I-M253 that's about 9.5 less common so it would amount to around 6.3% of I1 in Spain. 27 of the 45 DF29 is under Z63 which means it could be up to 4% of the population. If that's the case and it doesn't have to be again it's rough estimates, but still it indicates a significant presence of Z63 there the sample size isn't that small. I'm thinking Visigoths maybe.

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

     dink (12-12-2018),  Michał (12-13-2018),  Pylsteen (12-13-2018)

  5. #54
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    Quote Originally Posted by Username View Post
    One more interesting thing about the chart is Spain and I1 particularly Z63. I did some rough calculations. It shows 943 R-343 and if that represents about 60% of the population you add the 99 samples of I-M253 that's about 9.5 less common so it would amount to around 6.3% of I1 in Spain. 27 of the 45 DF29 is under Z63 which means it could be up to 4% of the population. If that's the case and it doesn't have to be again it's rough estimates, but still it indicates a significant presence of Z63 there the sample size isn't that small. I'm thinking Visigoths maybe.
    Or Suebi. Visigoths were probably a mish mash of haplogroups from the Balkans as well that joined them by the time they reached Iberia.

  6. The Following 4 Users Say Thank You to dink For This Useful Post:

     JonikW (12-12-2018),  Michał (12-13-2018),  spruithean (12-12-2018),  Username (12-13-2018)

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