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Download full textNichols, Robert C. – 1976
A review of the twin literature and analyses of two large twin samples found identical twin correlations higher than fraternal twin correlations by about .20 for a variety of traits of ability, personality and interests. This was interpreted as indicating that about half of the variation among people in a broad spectrum of psychological traits is…
Descriptors: Academic Aptitude, Aptitude Tests, Birth Rate, Correlation
