Davies 2016 IQ GCTA: h^2=0.31, test-retest 0.65; so true GCTA = (sqrt(0.31)/sqrt(1*0.65))^2=0.48, half again as much? Serious underestimate.
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@KirkegaardEmil I think I would be surprised if you couldn't. You can disattenuate regular heritability this way, so why not GCTA?
@gwern I don't think one can use it on H2 values either. One must do it on the MZ DZ correlations, then calculate the new ACE parameters.
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@gwern Recall, that H2 is r (phenotype x genotype)^2, so one would need to sqrt first, then disattenuate, then square. I think. :) -
@KirkegaardEmil Yes, which is what I did. Convert to r, convert back to r^2.
End of conversation
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