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Robin_Powell comments on Policy Debates Should Not Appear One-Sided - Less Wrong
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The experimental evidence for a purely genetic component of 0.6-0.8 is overwhelming
Erm. 0.6-0.8 what?
-Robin
Probably 60-80% heredity. But that is also meaningless, because I have no idea which population it refers to.
I assume he means an R or an R^2 of 0.6-0.8. Both are measures of correlation. R^2 would be the percent in the variation of one twins intelligence predicted by the intelligence of the other twin.