Saturday, March 14, 2015

Yamnaya likelihood among present-day populations in comparison to Early Neolithic farmers, Western huntergatherer and Iron Age Britons

This test tries to estimate how much present-day populations have preserved Yamnaya affinity.  Each of three ancient comparison groups are compared to Yamnaya samples and to present-day populations.  Populations scoring more are more Yamnaya-like than less scoring ones.  Positive scores mean that the population in first column has more Yamnaya admix than the ancient comparison group and vice versa with negative scores.  Please note that this test doesn't try to compare present-day populations to each other but to their position between ancient populations and ancient migrations.


Hungarian EN samples versus Yamnaya
 




Loschbour vs Yamnaya
























































Iron Age Britons versus Yamnaya




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4 comments:

  1. Helgenes50March 16, 2015 at 10:09 AM

    Thank you for your work Mauri,

    How to evaluate the ancient migrations ?
    What mean the number values and what is the meaning of score and Z
    It seems to me that the number must be negative, but I don't understand the reason

    The admixtures are more easy to interpret

    ReplyDelete
  2. MauriMarch 16, 2015 at 10:51 AM

    Let's name populations correspondingly to my test as a,b,c and d. If the score value is positive then the gene flow exists between a and c or b and d. If the value is negative the gene flow exists between a and d or b and c. But when d is Chimp the probability for humans to share gene flow with d is very distance and practically impossible. So we can infer gene flows using a, b and c.

    Z-score stands for reliability. I am not mathematician, but as far as I understand it tells us how many meaningful transactions we have and where they locate on standard deviation curve. Something like that. If you understand maths, you can try to find it by Google.

    As I mentioned this doesn't compare straight present-day samples. To see how they score we need admixture analyses, because most people carry different ancient genes. Reich Lab. has now introduced a tool doing this work, but I have not yet experience about it.

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  3. MauriMarch 16, 2015 at 11:18 AM

    For further details Reich Lab's documentation is available here: http://genetics.med.harvard.edu/reich/Reich_Lab/Software_files/admrel3.tar.gz

    ReplyDelete
  4. Helgenes50March 16, 2015 at 1:08 PM

    Thanks for all your explanations and for the link

    ReplyDelete

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