Jensen (1971) supports his estimation of heritability from unsquared MZ twin correlations on the assertion that heritability is analogous to reliability. This plausible argument is substantiated by a mathematical proof which expresses both heritability and reliability as coefficients of determination.
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References
1.
JensenA. R.Note on why genetic correlations are not squared. Psychological Bulletin, 1971, 75, 223–224.
