second-highest GPS for intelligence achieved results only slightly above average This doesn't need much explaining, the correlation between the score and test

second-highest GPS for intelligence achieved results only slightly above average This doesn't need much explaining, the correlation between the score and test results just isn't that high. That's all. Saying "environmental factors" here is, I think, nothing more than a polite way of saying "noise". People think about nonlinearities too. My understanding is that we're a long way from having such good data that it would help our predictions to include them. Steve Hsu writes about this, I can't find the perfect link but here's a start: http://infoproc.blogspot.com/2014/11/additivity-and-complex-traits-in-mice.html http://infoproc.blogspot.com/2014/11/additivity-and-complex-...