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Posthuma is wrong. The h² of IQ is about 80% for adults, meaning the best genetic prediction is r = .89. This is about the same as a multiple hour, expensive IQ test. It will quickly become cheaper to 'administer' an IQ test from genomics. Better begin thinking about implicationspic.twitter.com/ncj28l3KRg
One could probably optimize things further with CAT, but in the broad perspective and current practice, DNA will win because it gives you a measure (imperfect too) of every other heritable trait for which a predictor exists.
Looking up prices for a professional psychologist to administer an IQ test in Denmark, typical price is 3000-4000 DKK, i.e. 500 to 660 USD. Even commercial DtC sellers for microarrays go for 99 USD, likely to drop more.
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