Henry Harpending and Michael Weight have a rough draft of a paper on personality traits of the Amish versus their “English” neighbors that fits in nicely with their theory that the Amish have been “boiling off” their least-Amish genes for about ten generations in America by losing 10% or 15% of each generation to the outside (“English”) world.
The data comes from a late 1960s dissertation by a young social scientist who gave the 180 question Cattell personality quiz to 25 Amish male teenagers and 25 non-Amish male teenagers in the same rural Indiana county. Raymond Cattell’s theory of personality had 16 factors. The graph to the right shows how the Amish (Red A) did versus the Indiana “English” (Blue I) with both displayed relative to Cattell’s UK index population (who, by definition, scored at the dead center of the graph).
Not a lot of overlap. For example, the late-1960s Daviess County, Indiana youths saw themselves as highly radical/experimental, while the Amish youths saw themselves as fulfilling all the stereotypes about the Amish.
Some of this divergence might have to do with the “English” having the Amish around to compare themselves to: “Sure, I’m just an average Indiana small town boy, but compared to these Amish squares, I’m practically Jimi Hendrix.”
A long time ago I saw some personality exam where Swedes and Danes (or perhaps Swedes and Norwegians) scored at opposite ends of the world on certain traits. I have to believe that’s somewhat from Swedes and Danes being finely tuned to noticing average differences amongst each other. That doesn’t mean the differences aren’t real.