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My question is, how could the producer of this graph place the principle components (such as Atlantic, Amerindian, West Asian, etc) onto the chart? I mean, those principle components seemed arbitrarily located onto the chart because as far as I know, when doing principle component analysis, principle components should be equidistant from their adjacent components and therefore form a circle in a 2 dimensional plane. Do you also think the principle components are arbitrarily located on the PCA graph of Eurogenes K15 by Orange?
You can reach the full website here: https://gen3553.pagesperso-orange.fr/ADN/K15.htm
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