Dienekes, September 23, 2014

It’s great to see that the massive dataset of 23andMe was used for a study like this that seeks to capture the landscape of ancestry of different American groups.

First, distribution of ancestry in African Americans:

The higher fraction of African ancestry in the south and of European ancestry in the north, shouldn’t be very surprising. {snip}

Second, distribution of ancestry in “Latinos”:

To my eye, this seems like more African ancestry in the eastern parts (presumbly from Caribbean-type Latinos?) and more Native American ancestry in the west.

Third, distribution of ancestry in European Americans:

Overall, it seems that relatively few (less than 5%) of European Americans have more than 2% either African or Native American ancestry in any of the states, so the breakdown of European ancestry into various subgroups is perhaps more interesting.{snip}