F4 ratio estimation confirms Nordic admixture in Amerindians

I ran the F4 ratio estimation program from ADMIXTOOLS on the HGDP Amerindian populations to see how the results would compare with those from ADMIXTURE and DIYDodecad.

Referring to the phylogeny for F4 ratio estimation below, I used San for the O population, Dai for the C population, Orcadians for the B population, Sardinians for the A population, and Amerindians for the X populations.

f4-ratio

The results are below. The Nordic admixture proportions are in the alpha column, and are expressed as fractions of 1, not as percentages.

                 alpha     std. err  Z (null=0)
Karitiana     0.182781     0.021297      8.583
    Surui     0.211791     0.023151      9.148
Colombian     0.157253     0.020357      7.725
     Maya     0.204853     0.016572     12.362
     Pima     0.186089     0.019864      9.368

For comparison, here are the Nordic admixture percentages from the K = 17 admixture analysis of Amerindians:

              Surui Colombian  Maya Karitiana  Pima
Nordic        12.14     14.11 18.98     12.16 14.37

And here are the Nordic admixture percentages from the K = 16 admixture analysis of Mongoloids:

              Yakut Karitiana  Pima Surui Colombian  Maya Uygur Hazara
Nordic        12.51     15.96 17.71 16.48     16.74 21.90 16.70  15.37

There is good general agreement between all three analyses. They all put the Nordic admixture of the Amerindian populations in the 10 to 20 percent range.

Substituting Yoruba for San, Han for Dai, or Russians for Orcadians in the F4 ratio estimation does not significantly change the results.

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One comment on “F4 ratio estimation confirms Nordic admixture in Amerindians
  1. […] May 17: F4 ratio estimation confirms Nordic admixture in Amerindians […]

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