Björklund, Anders; Eriksson, Karin Hederos; Jäntti, Markus - 2009
neighbourhood influences, the sibling correlation is a broader measure of the importance of family background than the ….473, suggesting that family background explains approximately 50% of a person's IQ. Estimating sibling correlations in IQ we thus find … that family background has a substantially larger impact on IQ than has been indicated by previous studies examining only …