So the Nature mega-meta-analysis of twins studies (N > 14M). Confirms heritable nature of human traits. Also ~0 shared environment. (1/n)...
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Replying to @JayMan471
Contains most twin studies across the world. In the supplements, breaks down country heritability. Equal to higher h^2 outside NW Europe 2/n
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Replying to @JayMan471
Age breakdown shows declining C with age. However, study makes no attempt to correct for factors that bias estimates, like assortative 3/n
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Replying to @JayMan471
...mating (inflates C at the expense of A) or measurement error (shows up as E). So h^2 should be considered lower bounds only. 4/n
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Replying to @JayMan471
Ungated paper of twin meta-analysis here https://infotomb.com/6z8qy.pdf , see main page for supplements http://www.nature.com/ng/journal/vaop/ncurrent/full/ng.3285.html …
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