Berkson's paradox, I believe. Selecting for high nerdiness and high kickassery will tend to show a negative relationship in the resulting set if those two trai

Berkson's paradox, I believe. Selecting for high nerdiness and high kickassery will tend to show a negative relationship in the resulting set if those two traits are (waves hands) independent. [1] https://en.m.wikipedia.org/wiki/Berkson%27s_paradox https://en.m.wikipedia.org/wiki/Berkson%27s_paradox