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There absolutely are correct and incorrect ways of partitioning data into groups. Human genetics is no exception.

https://en.wikipedia.org/wiki/Cluster_analysis

https://en.wikipedia.org/wiki/Haplogroup

There are correct ways to group but there is no correct group size. Clustering algorithms inherently require some choice of sensitivity. There is no single correct choice for a given set of data, it all depends on what you’re trying to accomplish.

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