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Douglas_Knight comments on Open thread, December 7-13, 2015 - Less Wrong Discussion
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No, they didn't try to measure non-linear effects. Nor did they try to measure environment. That is all irrelevant to measuring linear effects, which was the main thing I wanted to convey. If you want to understand this, the key phrase is "narrow sense heritability." Try a textbook. Hell, try wikipedia.
That it did well on held-back data should convince you that you don't understand overfitting.
Actually, I would expect a bell curve transformation to be the most linear.
They didn't do well on the gene level:
Analyses of individual SNPs and genes did not result in any replicable genome-wide significant associationNo, the fact that you can calculate a linear model that predicts h_2 in a way that fits 0.4 or 0.5 of the variance doesn't mean that the underlying reality is structured in a way that gene's have linear effects.
To make a causal statement that genes work in a linear way the summarize statistic of is not enough.